Search Results

Free Essays
Good Essays
Better Essays
Stronger Essays
Powerful Essays
Term Papers
Research Papers

Your search returned over 400 essays for "Chemistry"
<< Previous  1  2  3  4  5    Next >>

These results are sorted by most relevant first (ranked search). You may also sort these by color rating or essay length.

Title Length Color Rating  
Chemistry Advances in Computers with the Work of Transistors - ... No cell phones. Can you even imagine. Nope. When we had created something like a transistor but definetly did not have the power of a transistor. A vacum tube. It used the Nike system. It was big and heavy so that it could hold all of the vacum tubes. For the precision to get the pure Nike accuracy you had to use analog adjustments. Todays transistors requires 1/15 the man power, is 1/15 the weight. And is more effective, easier to keep working and accurate. How did natural resources limit or advance your technology....   [tags: technology, circuts, resources, society] 575 words
(1.6 pages)
Good Essays [preview]
The Chemistry behind our Television Sets - ... Families looked to each other for entertainment and conversations were a lot more common without a television to distract them. Families also ate around the table in the dining room, rather than huddled around the TV in the living room. Plasma is an ionized gas consisting of positive ions and free electrons that helped to advance the television. The newer models of televisions contain plasma in their screens. Plasma screens are made up of groups of cells called pixels. These pixels are composed of three sub-pixels that consist of three different colors; green, red, and blue....   [tags: science and technology development] 1087 words
(3.1 pages)
Better Essays [preview]
History of Chemistry: The Advantages of the X-Ray - ... A physical examination is simply looking at the body, feeling the body, listening to sounds the body makes, and usually tapping on the body to see what sound it produces. In the past, doctors could only use these methods to figure out where a broken bone was located, or a tumor, or even a bullet. Of course, theses examinations were not free no the patient, they had to pay. Life before the X-ray was un-imaginable, and the invention has helped people since then. Even though the X-ray can have many advantages, it can also have disadvantages that limit its use....   [tags: invention, medcial, society, future, safety] 689 words
(2 pages)
Better Essays [preview]
Statement of Purpose to Study Biology and Chemistry - ... The close interaction built and Her ability to assure, educate and empowers the patients to take control of their well being was admirable. It was heartening to observe Dr tan attend to each walk-in patients professionally, conduting the assessments carefully, all the while maintaining her patience and empathy. Being a people person, I know that a job that interacts and converses with wide range of people is the right fit for me. I also had the privilege to speak with Dr Tan and the other Dr on shift after the last patient....   [tags: medical, volunteer, academics] 775 words
(2.2 pages)
Research Papers [preview]
Advanced Chemistry Theory - Questions and Answers - 2. What was phlogiston. Based on what theoretical and experimental bases did Lavoisier reject it. According to Bowler’s Making Modern Science, A Historical Survey, the theory of phlogiston was first stated by Johann Joachim Becher in 1667. In 1703, Georg Ernst Stahl, a professor of medicine and chemistry at Halle, proposed a variant of the theory in which he renamed Becher’s terra pinguis to phlogiston theory and it was in this form that the theory had it influence. Phlogiston was a fire-like substance without color, odor, taste or mass that every combustible substance was in part composed of, and it was released during combustion (Bowler 56)....   [tags: History, Refuted Theories]
:: 1 Works Cited
1613 words
(4.6 pages)
Strong Essays [preview]
Lasting Love Requires Chemistry and Commitment - Little girls dream about love. Young girls long to be loved. Maturing young women desire love. Actually, from the womb to the grave the need to be loved is a craving that must be satiated. Love can be an ever eluding force to be reckoned with. In contrast, love can capture a heart in a moment and last a lifetime. Love can be found in the imaginary world of fairy tales. However, love takes on a whole new dimension when one views it through the lens of reality. True love can last a lifetime. Little girls begin to watch fairy tale stories pertaining to love long before they can ever really understand such a thing....   [tags: Relationships Love Gender Roles]
:: 3 Works Cited
1220 words
(3.5 pages)
Better Essays [preview]
Parallel Combinational Chemistry to Produce Ester - Esters are defined as molecules consisting of a carbonyl group which is adjacent to an ether linkage. They are polar molecules which are less polar than alcohols but more so than ethers, due to their degree of hydrogen bonding ability. Most often derived from reacting an alcohol with a carboxylic acid, esters are a unique, ubiquitous class of compounds with many useful applications in both natural and industrial processes 1. For example, within mammals, esters are used in triglycerides and other lipids as they are the main functional group attacking fatty acids to the glycerol chain 2....   [tags: fisher esterification,carboxylic acid, grape odour]
:: 15 Works Cited
2076 words
(5.9 pages)
Term Papers [preview]
Chemistry and Tissue Engineering: Synthetic Polymers - ... In addition to the fast and efficient polymerization process, PVA hydrogels can be tailored to produce materials with mechanical properties appropriate for a desired application (Jiang, Liu and Feng, 2011). Further, the numerous pendent hydroxyl groups provide sites for the attachment of bioactive molecules, such as peptides, to signal cell attachment, proliferation, differentiation, or migration (Stephens‐Altus et al., 2011; Ranjha and Khan, 2013). Schmedlen et al., reported photoactive polyvinyl alcohol hydrogels (PVA) for use as tissue engineering scaffolds (Schmedlen et al., 2002)....   [tags: PEG, natural pymers, ] 1340 words
(3.8 pages)
Strong Essays [preview]
Chirality in Chemistry - Chirality in Chemistry Chirality is a term which may be applied to any asymmetric object or molecule. It is the property of non-identity of an object with its mirror image. A chiral compound is one which is not superimposable on its mirror image. This property of molecules has a great importance in the chemistry feild as it provides us with an understanding of the shapes of molecules which then in turn, gives us an insight on the way they react in a particular reaction. Chirality in chemistry is described in many ways but the universal defination of chirality was given by Lord Kelvin in 1904 who defined chirality in his 'Baltimore Lectures' on 'Molecular Dynam...   [tags: Papers] 808 words
(2.3 pages)
Better Essays [preview]
Chemistry and Carbohydrates - The Chemistry of Carbohydrates The chemistry of carbohydrates most closely resembles that of alcohol, aldehyde, and ketone functional groups. As a result, the modern definition of a carbohydrate is that the compounds are polyhydroxy aldehydes or ketones. The chemistry of carbohydrates is complicated by the fact that there is a functional group (alcohol) on almost every carbon. In addition, the carbohydrate may exist in either a straight chain or a ring structure. Ring structures incorporate two additional functional groups: the hemiacetal and acetal....   [tags: essays research papers fc]
:: 2 Works Cited
1070 words
(3.1 pages)
Strong Essays [preview]
Chemistry of Biology - Chemistry of Biology There are many parts to every living thing. These basic parts have specialized jobs, which give shape and function of everything in the universe. The basic building block for all mass is the atom. There are many different parts to the atom. The electron is a negatively charged particle that revolves around the nucleus in electron shells. The electron is one of the smallest particles that make up the atom. The counterpart to the electron is the proton. This is a larger positive charged particle....   [tags: Papers] 560 words
(1.6 pages)
Strong Essays [preview]
Chemistry Practical Investigation-Volumetric Analysis - ... Random errors are errors in measurement that lead to measured values being inconsistent. The word random indicates that they are unpredictable and have unexpected value even when the same instrument is used. If random error is present in this experiment it would be because of the variation of eye level on the meniscus solution to the making on the apparatus suck as volumetric flask, burette, pipette and so on. This ransom error can be reduced by repeating the experiment. Thus the precision is accurate because it is not affected by any random errors....   [tags: concordant titres, measurement, random errors] 738 words
(2.1 pages)
Research Papers [preview]
How Water Contributes To The Structure And Behavior Of Biological Molecules - Introduction Water,H2O, is one of the most important chemical compounds on earth, and is commonly referred to as the basis of life on earth, because it is used in all type of chemical and biological processes, e.g. solvent, protein folding, stability of nucleic acids etc. Water is found in 3 states (solid, liquid, and gas), and is the most abundant naturally occurring substance on earth, covering 75% of the earth surface. Structure Water consists of 2 hydrogen atoms and 1 oxygen atoms, (held together by covalent bonds between the O-H atoms) and 2 lone pair of electrons on the oxygen atom, resulting in the formation of a bent shape with a bond angle of 104.5⁰....   [tags: Chemistry]
:: 7 Works Cited
1712 words
(4.9 pages)
Powerful Essays [preview]
Improvements on the Performance of a Microbial Fuel Cell for Biological Treatment of Hexavalent Chromium - Chromium in the natural environment General A great variety of chemical compounds can be found in water, not all of them of the same concentration or significance. Even with respect to the same chemical element, different aquatic conditions like reduction/ oxidation potential and pH may bring out a variety of different properties with varying importance. Among other inorganic contaminants, chromium can be found in water as a result of anthropogenic processes like electroplating, leather tanning, textile and pigment manufacturing and wood preserving (U.S.E.P.A., 2000)....   [tags: Chemistry ]
:: 10 Works Cited
509 words
(1.5 pages)
Good Essays [preview]
The Affects of Different Yeast on the Rate of Fermentation - AIM: To see how different yeast affect and influence the rate of fermentation, how much alcohol is being produced and how this affects the overall quality of wine produced. BACKGROUND INFORMATION: Alcohol, is mostly thought of as ethanol which is the alcohol which is found in alcoholic beverages such as wine and beer. But there are many different varieties of alcohol such as methanol, propanol and butanol. In chemistry terms “alcohol” is a compound of a hydroxyl group which is covalently bonded to a carbon chain which can be seen in figure 1....   [tags: Chemistry ] 1156 words
(3.3 pages)
Strong Essays [preview]
The Chemical Dynamics of Cadmium in the Soil Environment - Abstract Cadmium (Cd) is known to be toxic to plants and animals and can be transported to both ground and surface water through specific physical mechanisms. The chemical dynamics of Cd and other similar (heavy) metals in the soil environment is controlled by its interactions with both solid and aqueous phases of soil. The concentration of Cd and other metals in soil solution is highly influenced and regulated by processes such as adsorption-desorption, ion exchange, precipitation-dissolution, and soil and solution phase composition....   [tags: Chemistry] 979 words
(2.8 pages)
Better Essays [preview]
History of Biochemistry: Chemistry and Biology Connection to the World Today - ... Chemistry is a broad science, embracing the concepts of creation of molecules and the manipulation of atoms and dealing with microscopic and macroscopic scales. It covers interactions with plants, animals and humans through agriculture, biology and medicine and with the physical world through electronics, new building materials and new sources of energy. It affects the people of our planet, protecting and preserving our health, ecology, culture and heritage. We have advanced chemistry by advancing battery life and creating better battery etc....   [tags: society, matter, organisms. science,] 1001 words
(2.9 pages)
Better Essays [preview]
The Chemistry Times: Why I Want to Study It - To me, chemistry is an ever evolving field, like making a strand of nylon, it is always expanding. Chemistry is advancing at an inconceivable speed, with discoveries varying enormously from the structure of an atom to the synthesis of aspirin. One aspect of chemistry that I admire is that the content is not only supported by the theory but can also often be demonstrated practically, this is shown well when analysing rates of reaction, therefore providing a stronger understanding of the topic. The most fascinating part of chemistry is the transformation of raw materials into useful products and this is demonstrated extremely well by the reaction between 1,6-diaminohexane solution and decanedi...   [tags: theory, practically, reaction, transformation] 558 words
(1.6 pages)
Good Essays [preview]
Chemistry's Presence in Technology Isn't Always Blatantly Obvious - ... It is believed it was used for electroplating, which is the placing of metals such as gold onto other less precious metals (When Was the Battery Invented?). So this gives a simple idea of what society was like before batteries were invented. Electroplating precious metals would not be possible. This is only the starting point of how batteries impact society. With improvements upon the battery, it would stretch into more technologies. With the foundation of the battery’s origin understood, a basic understanding of how a battery works is needed to see how new resources improved upon it....   [tags: battery power] 899 words
(2.6 pages)
Better Essays [preview]
Alchemy -the Predecessor Of Modern Chemistry - There are many ways to examine the subject of alchemy, including alchemy as a source of symbolism, psychology, and mysticism. It has also been an influence on the world view of various writers, artist, and musicians. The focus of this report is alchemy as a pre-chemistry, which gave a new impulse towards the preparation of medicinal remedies and also was a major influence on today's scientific investigations.Alchemy is an ancient art, practiced in the Middle Ages. The fundamental concept of alchemy stemmed from Aristotle's doctrine that all things tend to reach perfection....   [tags: essays research papers] 659 words
(1.9 pages)
Strong Essays [preview]
Chemistry - Robert Boyle is considered both the founder of modern chemistry and the greatest English scientist to live during the first thirty years of the existence of the Royal Society. He was not only a chemist and a physicist as we know him to be, but also an avid theologian, a philanthropist, an essayist, and a beginner in medicine. Born in Lismore, Ireland to Richard Boyle, first earl of Cork, and Katherine Fenton, his second wife, Boyle was the youngest son in a family of fourteen. However he was not shortchanged of anything....   [tags: essays research papers] 924 words
(2.6 pages)
Better Essays [preview]
The Exploration of the Applications of Chemistry in Space Through the ISS - ... Also, there is a system currently in testing to determine water and disinfectant quality onboard the ISS, which will allow astronauts to know right away if something is wrong with the water supply (Water Quality). These are not the only Life Support systems, as climate control is also vital to human space exploration. In space, it can get as hot as 121 C0, and as cold as -157 C0, and this is why it is important to have a stable, livable temperature on the ISS, as the astronauts and cosmonauts would either freeze to death and then thaw and freeze over and over again, or boil to death and then freeze and then thaw out to eternity (Life Support)....   [tags: joint venture between 14 countries]
:: 7 Works Cited
912 words
(2.6 pages)
Strong Essays [preview]
The Gender and Chemistry of Suicide - The Gender and Chemistry of Suicide Suicide is a perplexing aspect of human behavior. There are hundreds of possible causes for suicide, but one underlying reason usually prevails. When life seems unbearable and hopelessly dreary, the only apparent way out for some individuals is to end their own painful existence. To other mentally "stable" individuals, suicide can be a question that can never be answered. Suicide is final, and no one comes back to explain why the decision was made to end their own life....   [tags: Papers] 940 words
(2.7 pages)
Good Essays [preview]
The Importance of Chemistry in Everyday Life - The Importance of Chemistry in Everyday Life During laboratory technique 1 we learned how to separate insoluble liquids from solids by means of filtration, and how to separate a dissolved solid from a liquid by means of evaporation. I have often asked myself the importance of some of the required classes in my schedule and how they can relate to everyday life. I believe in the saying that if you don’t use it you will lose it, meaning that if the concepts I learn cannot be applied to something that I will remember on a daily basis then the possibilities of me not remembering them at all are greater....   [tags: Papers] 398 words
(1.1 pages)
Strong Essays [preview]
Chemistry - Twelve was a terrifying age for me. It was the year that everything became open to doubt. That year I questioned all subjects from God to gravity. My friends seemed unreliable so I ostracized myself, avoiding all intimacy and any semblance of amiability. I stopped listening in church because my Sunday-School lessons brought up more questions than I was capable of dealing with. Instead I concentrated on the two constants in my life, school and family. Education and love became the two pillars my world was balanced on....   [tags: Personal Narrative Essays] 990 words
(2.8 pages)
Strong Essays [preview]
Chemistry - Chemistry Aim: I am trying to find out whether the equation 2CuCO3 ® Cu2O + 2CO2 + ½O2 or the equation CuCO3 ® CuO + CO2 is correct for the decomposition of copper carbonate. Introduction: This is my background research, this information may help me when I am trying to see which equation is correct. I have used the book Chemistry 1 by OCR as my reference. Relative Atomic Mass: This is the mass of an atom of the element relative to the mass of an atom of carbon-12 which has a mass of exactly 12....   [tags: Papers] 750 words
(2.1 pages)
Good Essays [preview]
How Chemistry and Physics Affect Every Part of the World - An idea that has both perplexed and intrigued me is the concept of how science, in my case chemistry and physics, directly impacts every single part of the world. I have always been puzzled by the secrets of what the world is composed of and how exactly everything works in the world. However, it wasn’t until recently in high school that I began to grasp the basic fundamentals of how the world actually does operate. In order to understand the origin of this desire to attain more knowledge and discover more about the way life works, I must provide a small anecdote from last year in my AP chemistry class....   [tags: fundamentals on how the world works] 522 words
(1.5 pages)
Good Essays [preview]
The Value of Chemistry in Society - The Value of Chemistry in Society For some time in the modern world, and especially subsequent to the events of September 11th, there has been a wave of concern regarding chemistry and its potential destructive powers. There are many people who hold a fearful attitude towards the chemical industry and its products. This is because the threat of chemical and bio-chemical weapons is very real and is a negative aspect of the business. Also it is often deemed environmentally unfriendly and unsafe for the nearby public....   [tags: Papers] 1239 words
(3.5 pages)
Good Essays [preview]
Chemistry: The Other Foreign Language - Chemistry: The Other Foreign Language How is it that a student can come to my office hours, explain the complicated concepts that a problem set question is based on, even go as far as to intuit the right approach for solving the problem, and yet, is not able to derive the right answer. I am sure many GSIs of general chemistry, or of any introductory physical science class for that matter, have asked themselves this question numerous times throughout a semester. One of the biggest problems facing students in general chemistry classes is their inability to communicate what they actually know about the concepts on an exam or a problem set....   [tags: Graduate Admissions Essays] 599 words
(1.7 pages)
Good Essays [preview]
Social Relevance Report: Caffeine - Social Relevance Report Chemistry TOPIC: CAFFEINE CONTENTS 1.0 INTRODUCTION 1-2 1.1 What is caffeine. 1.2 Social Significance 1.3 Overview 2.0 CHEMICAL BACKGROUND 3-5 2.1 Chemical Properties of Caffeine 2.2 Physical Properties of Caffeine 2.3 How Caffeine Works in the Human Body 3.0 SOCIAL SIGNIFICANCE 6-9 3.1 How caffeine affects the society. 3.1.1 Health 3.1.2 Caffeine Addiction and Withdrawal 4.0 CONCLUSION 10 BIBLIOGRAPHY 11 1.0 INTRODUCTION Figure 1.1 Coffee Beans (Clip Art, 2010) 1.1 What is caffeine....   [tags: Chemistry]
:: 12 Works Cited
1779 words
(5.1 pages)
Powerful Essays [preview]
Chemistry: The Molecular Formula of Fuel and the Combustion of Fuel - ... JP-4 is considered a “wide-cut” fuel because it is produced from a wide temperature range and it contains a wide array of carbon length chains which include four to sixteen carbons long. This specific fuel is 13% aromatic hydrocarbons, 1% olefin hydrocarbons, and 86% saturated hydrocarbons. It has a boiling temperature range of 60-270 degrees Celsius. Unfortunately, this fuel is highly flammable. The military completely replaced JP-4 with JP-8 because of the fact that it is less flammable, so it was less hazardous to the pilots....   [tags: aviation, environment, aircraft] 1620 words
(4.6 pages)
Strong Essays [preview]
Contribution of Thomas R. Cech to the Field of Chemistry - Contribution of Thomas R. Cech to the field of Chemistry Thomas Robert Cech is a well-known chemist who used his knowledge of science to discover several theories in order to enhance the study of molecules and atoms in different matters. In summary, Thomas Cech received his PhD degree in Chemistry from the University of California. He was also a lecturer at the University of Colorado where he lectured on chemistry and biochemistry. Cech’s research and hard labour has brought many awards to him and one of the major awards he received is the Nobel Prize in Chemistry in 1989....   [tags: RNA molecules, dna]
:: 3 Works Cited
580 words
(1.7 pages)
Good Essays [preview]
Food Chemistry Focuses on the Production of Processed Food - ... There are different techniques available for identification of aroma compounds, and different techniques are also used for quantification of these compounds. One technique used is dynamic headspace gas chromatography (DHGC), in which a sample is analyzed through a method that vaporizes and separates its components and can be coupled with a mass spectrometer. The mass spectrometer can further separate the components by its mass and charge and results can be displayed and analyzed. This paper will focus on why dynamic headspace gas chromatography and mass spectrometry are best served for use in the quantification of aroma compounds....   [tags: aroma, nourishment, compounds] 583 words
(1.7 pages)
Research Papers [preview]
What I have Learned in Chemistry, Grade 10 - From the unit of chemistry in grade ten science, the students have learned many things from different types of elements in the chart all the way to how each element impacts the daily life each student or even adult lives in. Some of the things I as a student have learned include how to draw the different elements in a bohr rutherford diagram, balancing chemical equations, types of chemical reactions, and even information about the different types of acids and bases. Although there were many other things in the unit, these four definately helped me learn about chemistry in a more in-depth way, as well as teaching me something very new since these were some things a few of the students had nev...   [tags: Science, Atoms] 859 words
(2.5 pages)
Good Essays [preview]
Notes on Biology, Cells and Chemistry - REVIEW UNIT 1-THE CELL LIFE *There is no def. for life *Life can be characterized by a list of things that we might agree living thing have in common-organized and contain complex chemical substances, Made up of one or more cells, Use Energy, Have a definite form& Limited size, Have a limited life Span, Grow, Respond to changes in the environment, Reproduce, Evolve over time.*Metabolism is all the chemical reaction occuring in the cell of an organism*All Living things must carry out processes to maitain life and homeostasis- Nutrition, Transport, Respiration, Synthesis and Assimilation, Growth, Excretion, Regulation, Reproduction, Metabolism.CHEMISTRY BASICS *Atoms of the elements are t...   [tags: essays research papers] 916 words
(2.6 pages)
Strong Essays [preview]
Chemistry Career Research Project: Forensic Science - ... More and more unsolved cases are being resolved, as well. However, forensic science has provided the world with more than just criminal investigation. DNA analysis has allowed parents to be reunited with their children and vice versa. Military remains can know be identified and families can be at peace. By identifying patterns, safety precautions and accident preventions can be issued in the form of recalls. Diseases can be quickly cured and terrorist attacks can be hindered because of the ability to track and locate explosive devices....   [tags: lab, court, technology]
:: 8 Works Cited
533 words
(1.5 pages)
Research Papers [preview]
The Chemistry of Painting Cars - The Chemistry of Painting Cars It is necessary to paint cars because the paint protects the steel of the car from corrosion, paint fills and smooths out any imperfections in the steel surface and it provides a durable, decorative, glossy appearance. If rusting continually takes place the car becomes unsafe. When water and oxygen come in contact with the metal of the car surface, several redox reactions happen. The oxygen is reduced to hydroxide ions and iron is oxidized to Fe2+ ions which pass into solution....   [tags: Papers] 1045 words
(3 pages)
Strong Essays [preview]
Chemistry Investigation on Neutralisation Reaction - Chemistry Investigation on Neutralisation Reaction Plan Neutralisation is the reaction that occurs when an acid has its acidity, that is its hydrogen ions removed by, another chemical containing OH- hydroxide ions. Chemicals that can cancel out an acid in this way are: bases (metal oxides or hydroxides), alkalis (bases that dissolve), metals (e.g. magnesium) or metal carbonates (e.g. marble chips) All of these have a similar way of removing the hydrogen from the acids (they swap it or their metal atoms) but the reactions are quite different....   [tags: Papers] 2294 words
(6.6 pages)
Strong Essays [preview]
History of Chemistry: Hydrogen as an Alternative Use of Energy - ... Without an abundant fuel source like hydrogen there is wars started over the not so abundant fossil fuels and there is a struggle for power over the monopoly. Natural resources advance the use of hydrogen because it makes up 90 percent of the known universe, it also is the most abundant element on Earth. Hydrogen has the highest combustion energy per pound of any fuel which makes it the most energy efficient. A kilogram of hydrogen produces the same amount of energy as a gallon of gas. 1 gallon of gas is equal to about 8.35 pounds and I kilogram is equal to 2 pounds....   [tags: prices, atmosphere, lovations, sources] 759 words
(2.2 pages)
Better Essays [preview]
Chemistry and Crime Investigation - Chemistry Reveals Secrets behind C.S.I. A bloodied apartment left by a disgruntled tenant sends Grissom, Sara and Warrick on the journey to discovering a crime. While Catherine and Nick set out to investigate a dead body fully dressed in scuba gear stuck high in a tree in the middle of a raging fire. A couple was about to look at the apartment when they saw the blood stains on the wall and on the floor. They called 911. The C.S.I. (Crime Scene Investigators) came to see the scene of the crime. After some investigations, they thought that the victim was hid in the walls; so they have to break the walls of the whole apartment....   [tags: Forensics] 585 words
(1.7 pages)
Strong Essays [preview]
Green Chemistry - Green Chemistry Many companies all over the world produce chemicals for their products that are harmful to the environment, human health, and to all living species. Green Chemistry is the use of chemistry for the prevention of chemical pollution to the environment by using chemicals that are benign, or not harmful. The Environmental Protection Agency (EPA) states that the mission of Green Chemistry is, “To promote innovative chemical technologies that reduce or eliminate the use or generation of hazardous substances in the design, manufacture, and use of chemical products.” Green Chemistry contains any aspects and types of chemical processes that reduce the negative ef...   [tags: essays research papers] 453 words
(1.3 pages)
Good Essays [preview]
Green Chemistry - If We Had Known About Green Chemistry In 1951, How Would Things Be Different Today. Green Chemistry is the making of chemical products that reduces or eliminates the use and production of hazardous substances in the designing, making, and use of chemical products. It involves the designing and re-designing of chemical creation and chemical products to prevent pollution which will therefore solve environmental problems. Green Chemistry is environmentally safe and has very little side effects on human health and the environment....   [tags: essays research papers] 724 words
(2.1 pages)
Good Essays [preview]
Reduced Nickel Centers - Reduced nickel centers are important in a number of interesting and useful transformations including catalytic cross coupling of alkyl electrophiles,145,146 evolution of dihydrogen by protonation of nickel hydrides,147 dioxygen activation,148 as well as imparting catalytic activity to several metalloenzymes.149 Our interest in nickel(I) centers derives from our longstanding interest in reductive dehalogenation reactions using transition metal complexes.31,70,76-79,122,150 Nickel-mediated dehalogenation has been observed with factor F430 (Figure 4.1), the nickel-containing prosthetic group associated with methyl-coenzyme M reductase in methanogenic organisms.22,49,151 This cofactor has been s...   [tags: Chemistry] 787 words
(2.2 pages)
Better Essays [preview]
Chemistry Investigation - Chemistry Investigation Investigation- To investigate the factors involved in the following reaction: Na2S2O3(aq) + 2HCl(aq) à 2NaCl(aq) + H2O(l) + SO2(aq) + S(s) PLANNING STAGE Variables: The following are variables which will affect my investigation. Temperature, Pressure, Concentration of Na2S2O3, Concentration of HCl, Stirring. The key variables which I'm going to investigate are Concentration of Na2S2O3 and Concentration of HCl. What I'm going to find out: I'm going to find out what effect varying the above stated variables has on the rate at which the reaction between Na2S2O3 and HCl takes place....   [tags: Papers] 2021 words
(5.8 pages)
Strong Essays [preview]
Chemistry Experiment - Chemistry Experiment How does the change in the electric current used in the electrolysis of copper sulphate solution affect the mass of copper deposited on the copper electrodes. Aim --- The aim of this experiment is to find out whether the mass of copper deposited on copper electrodes during the electrolysis of copper sulphate solution changes when the current used to electrolyse the solution is increased. Hypothesis ---------- I predict that if the current used to electrolyse the copper sulphate solution is increased, then the mass of copper deposited on the copper cathode will increase....   [tags: Papers] 2189 words
(6.3 pages)
Powerful Essays [preview]
Chemistry Investigation - Chemistry Investigation An investigation to find the optimum temperature that will produce the maximum amount of oxygen from hydrogen peroxide using the enzyme catalase Introduction Hydrogen peroxide is poisonous to all living things if it builds up in the cells but when it is introduced to the enzyme catalase the react between the two makes water and oxygen as byproducts. There are many factors witch affect the production of oxygen these are listed below. For this experiment the enzyme will be held in potato....   [tags: Papers] 817 words
(2.3 pages)
Strong Essays [preview]
Chemistry Experiment - Chemistry Experiment An investigation to find out how the rate of the reaction of hydrochloric acid and sodium thiosulphate solution is affected by the concentration of the sodium thiosulphate. I am going to investigate the effect of varying the concentration of sodium thiosulphate solution in a reaction with hydrochloric acid. The theory behind this experiment is that 'increasing the concentration can increase the rate of the reaction by increasing the rate of molecular collisions.' [IMAGE]Sodium Thiosulphate + hydrogen acid sodium chloride + sulphur +sulphur dioxide + water Or [IMAGE]Na SO (aq) +2HCL (aq) 2NaCL (aq) + SO (I) + SO (g) Plan ====...   [tags: Papers] 957 words
(2.7 pages)
Strong Essays [preview]
The Relationships between Chemistry and the End of Somehting - The Relationships between Chemistry and the End of Somehting In Chemistry and The End of Something we are told of different relationships and how they get stronger or in some cases break. Both authors use different literacy techniques that bring out the best and worst of the relationships so that we the readers are succumbed to each twist and turn that the characters themselves experience. Both stories start with very descriptive language before starting to explain the personality and relationships of each character....   [tags: Papers] 699 words
(2 pages)
Strong Essays [preview]
A Comparison between Chemistry and the End of Something - A Comparison between Chemistry and the End of Something Both in Chemistry and The End of Something authors explain to the readers how relationships can be essential and also how they can just break and end in an instance. Both the authors use various techniques to explain and describe these relationships using different literary techniques. At the beginning of Chemistry, Graham Swift describes a very secure relationship between: the boy, the grandfather and the mother. The boy is very comfortable with this relationship as he enjoys the company of both his mother and grandfather....   [tags: Papers] 436 words
(1.2 pages)
Strong Essays [preview]
Chemistry Study Guide - Chemistry Study Guide Chapter 9- Thermodynamics KE= ½ mv2 w= F&#8710;x w= force × distance &#8729; A state function refers to a property of the system that depends only on its present state. &#8729;Internal Energy = heat + work &#8710;E = q + w &#8729;Pressure = Force/Area = P = F/A &#8729;Work= - external pressure × change in volume w = - P&#8710;V Enthalpy H = E + PV qp = &#8710;E + P&#8710;V &#8710;H = qp &#8710;H = H products – H reactants Ideal Gas Law PV = nRT Energy “heat” = 3/2 R&#8710;T Cv = 3/2 R = “heat” required to change the temp of 1 mol of gas by 1K at constant volume Energy required = “heat” – energy needed...   [tags: essays research papers] 523 words
(1.5 pages)
Good Essays [preview]
Chemistry- Collision Theory - .Experiment for Chemistry Coursework For this investigation I am looking at how the concentration of acid can change the reaction and how I can explain this using collision theory. My Prediction: I predict that the greater amount of concentration the faster the reaction will take place. Therefore, particles in the two compounds will collide faster. Due to my prediction if it is correct, I expect to see the cross on the paper disappear faster. As I already know that increasing one quantity will speed up the reaction as the particles are more likely to collide....   [tags: essays research papers] 1125 words
(3.2 pages)
Strong Essays [preview]
Metal Chemistry Experiment - Metal Chemistry Experiment Aim My aim is to plan and carry out an investigation that will enable me to put 5 metals in order of reactivity. The 5 metals are zinc, magnesium, copper, iron and calcium. I am also provided with Copper (II) Sulphate solution. Equipment Zinc, magnesium, copper, iron, calcium, 500 cm3 CuSO4, Polystyrene cup with lid, thermometer, measuring cylinder, stop watch, spatula and safety specs. Safety In the experiment I am using substances that are irritant and harmful....   [tags: Papers] 615 words
(1.8 pages)
Strong Essays [preview]
Chemistry Case Study - Chemistry Case Study We are the research chemist at Valentines metal extraction company. We have received the following letter: Dear Sirs, We have just discovered a blue mineral which we believe contains a copper compound. Could you please analyse the sample we have enclosed to see if there is any copper in it and see if it can be extracted. Yours Sincerely Freddie Jones I am sure that there is copper in the compound as it is a blue colour. All compounds that are blue or green contain copper in them....   [tags: Papers] 970 words
(2.8 pages)
Strong Essays [preview]
Chemistry Pilot Experiment - Chemistry Pilot Experiment Aim: The aim was to become accustomed to working with the equipment and to find optimum levels of hydrochloric acid and magnesium ribbon to produce 60cm of hydrogen, a sensible amount to produce in the real experiment. We also began to investigate the effect of temperature on the rate and the result of the product (hydrogen). It also served to discover any errors in the procedure which could affect the final result and prevent us getting accurate results, thus allowing us to eliminate these errors in the real experiment....   [tags: Papers] 671 words
(1.9 pages)
Strong Essays [preview]
Understanding Brain Chemistry - Understanding Brain Chemistry What is it that makes us human. Is it our actions, our sense of purpose, or our ability to keep our mind on as well as perform complex tasks. Is it that we analyze our own mental processes, as well as the processes of others. What exactly is a mental state, and what creates it. Is it a level of attentiveness, an impulse, or an emotional state. What is it that allows us to experience these things. The answers all lie within our brains. The brain, like the rest of the nervous system, is composed by and large of neuralgia (glial cells), nerve cells (neurons), that are immersed in a constant flow of cerebrospinal fluid....   [tags: Papers] 1216 words
(3.5 pages)
Strong Essays [preview]
Bioinorganic Coordination Chemistry - Bioinorganic Coordination Chemistry This experiment uses H2TTP made during the last lab and hydrated copper (II) acetate to convert the H2TTP to Cu(TTP). The reaction proceeds by being refluxed for 30 minutes. The final product is a non-iridescent purple color, unlike the vivid, shimmering purple color of the starting H2TTP. Introduction Thin layer chromatography, or TLC, is used as a prerequisite for column chromatography. When performing types of chromatography, like TLC, the polarity of solvents is extremely important....   [tags: Papers] 1030 words
(2.9 pages)
Strong Essays [preview]
Chemistry Catalyst Investigation - Chemistry Catalyst Investigation Aim To devise and carry out an investigation into how the concentration of hydrogen peroxide in a solution with distilled water will affect the rate of the catalysed reaction between hydrogen peroxide solution and manganese oxide. I will be studying the chemical catalyst manganese and its reaction with different concentrations of hydrogen peroxide. The liquid hydrogen peroxide decomposes according to the equation: 2H202 (l) 2H20 (l) + 02 (g) So to measure the rates of reactions we will measure the amount of oxygen given off by the reaction....   [tags: Papers] 3891 words
(11.1 pages)
Strong Essays [preview]
Chemistry of Psilocybin and Synaptic Transmitters Involved - Chemistry of Psilocybin and Synaptic Transmitters Involved Psilocybin is a type of hallucinogenic mushroom that is ingested by eating the raw fungi. The mushroom can also be made into a tea and drunk. In some of the later studies done on psilocybin, the drug was synthetically produced and then either inhaled or injected by an IV. The drug enters the blood stream and can cross the blood brain barrier because of it relative metabolic similarity to serotonin (Fuller 1985). This means that since psilocybin is chemical resemblance to the neurotransmitter serotonin, psilocybin can trick the protein channels embedded in the membrane of the blood vessel and pass through as if it we...   [tags: Chemical Drugs Drug papers]
:: 12 Works Cited
1779 words
(5.1 pages)
Strong Essays [preview]
Statement of Teaching Philosophy, and My Experience Teaching Chemistry in India - Statement of Teaching Philosophy “A teacher can never truly teach unless he is still learning himself. A lamp can never light another lamp unless it continues to burn its own flame. The teacher who has come to the end of his subject, who has no living traffic with his knowledge but merely repeats his lesson to his students, can only load their minds, he cannot quicken them.” … Rabindranath Tagore (Nobel prize in literature in 1913) This is my favorite quotation because it express what, I think, is the essence of teaching and learning....   [tags: Philosophy of Education] 1058 words
(3 pages)
Strong Essays [preview]
The Rhetorical Analysis of “The Chemistry of Wine Making” as an Example of Scientific Writing. - The article “Chemistry of Winemaking: A unique Lecture Demonstration” by L. B. Church of the State University of New York, seeks to demonstrate how the winemaking process can be used as a teaching tool. Found in the Journal of Chemical Education, the text uses an instructive and formal tone while discussing the process and how it might relate to the classroom. His rhetoric leans heavily toward the use of logic. Aimed for chemistry teachers, the article refrains from using step-by-step demonstrations of each and every process, and instead discusses the use of common techniques that could be used within the framework of Winemaking....   [tags: Science]
:: 1 Works Cited
1830 words
(5.2 pages)
Term Papers [preview]
Analytical Chemistry is the Study of the Separation, Identification, and Quantification of Chemical Components - ... Physicochemical methods4,5 are used to study the physical phenomena that occur as a result of chemical reactions. In the Physicochemical methods Optical (Refractometry, Polarimetry, Emission Spectrophotometry and Nephelometry or Turbidometry), Electrochemical (Potentiometry, Amperometry and Polarography) and Chromatography (Paper, Column, Thin Layer6, Gas Liquid7, High Performance Liquid8,9) methods are usually preferable. Methods involving nuclear reaction such as Nuclear Magnetic Resonance (NMR) becoming more popular....   [tags: physical properties, pharmaceutical, investigation] 929 words
(2.7 pages)
Better Essays [preview]
A Stoichiometry Experiment Involving Potassium Chlorate - Introduction In any science that requires computation, specifically in Chemistry, gathering measurements of various physical and chemical properties need to be strictly accurate and precise for it is in this most crucial phase that either make or break the quality and value of science. No matter how good the experiment was performed, without forethought on how to gather and process data correctly, the collected information would not be reliable enough to draw out a conclusion on it. This experiment is divided into two parts, thus having dipartite objectives for the whole experiment....   [tags: Chemistry] 1258 words
(3.6 pages)
Strong Essays [preview]
Separation of M-toluic Acid, Acetanilide, and NaCl - Discussion Overall this experiment was a success yielding 98.8% of the initial 1.34g of known compounds. Looking at Table 1 the problem of separation quickly becomes apparent, both M-Toluic Acid and Acetanilide are insoluble in water. This left two non-salts in one mixture, and what solvent to use to separate these two was the most important question as their respective melting points are also very similar. After looking at both compounds and noticing the M-Toluic Acid (Image 2) had an OH group hanging off of it next to a double bond, the H ion on the end would be susceptible to a base....   [tags: Chemistry] 505 words
(1.4 pages)
Strong Essays [preview]
Laws of Conservation of Mass and Energy - Introduction In any science that requires computation, specifically in Chemistry, gathering measurements of various physical and chemical properties need to be strictly accurate and precise for it is in this most crucial phase that either make or brake the quality and value of science. No matter how good one may perform the experiment, without forethought on how to gather data correctly, the collected information would not be reliable enough to draw out a conclusion on it. The main objective of this experiment is to explain thoroughly the reacting system which can be done through scientific observation because it is through this vital step that the facts needed to elucidate the reacting s...   [tags: Chemistry] 1224 words
(3.5 pages)
Strong Essays [preview]
The Chemistry of Alcohol - Alcohol is a class of organic compounds that is characterized by the presence of one or more hydroxyl groups (-OH) attached to a carbon atom. Alcohol was unknowingly produced centuries ago when fermentation occurred to crushed grapes (Pines, 1931). In today’s society alcohol is produced for the use of household products such as varnishes, cleaning products, but is more commercially important in the liquor business. A chemical process called fermentation accomplishes the production of ethanol, the alcohol or liquor....   [tags: fermentation process, ethanol, liquor]
:: 10 Works Cited
1138 words
(3.3 pages)
Strong Essays [preview]
The Chemistry in Cooking - ... First, the type of cooking someone had would depend on how much money they had. If they were poor they would just have cooked in a small fire in a hut inside their home. However, if they were rich they would either live in a castle or big house. Castle kitchens contained many appliances. So not only can you cook inside now, they also had utensils and were no longer using a stick. These kitchens contained ovens and huge fireplaces to smoke and roast meats on. They also by this point in time have other advantages to help cooking go more smoothly such as a way to get water supply with a sink that drains, a buttery, botterly, pantry, and storeroom....   [tags: history of cooked food ] 810 words
(2.3 pages)
Better Essays [preview]
Chemistry by Graham Swift, Snowdrops by Leslie Norris, and finally - Chemistry by Graham Swift, Snowdrops by Leslie Norris, and finally Superman and Paula Brown’s New Snowsuit by Sylvia Platt. How do the authors of the anthology deal with the subject of change. In this essay I am comparing three stories together. These stories are ‘Chemistry by Graham Swift’, ‘Snowdrops by Leslie Norris’, and finally ‘Superman and Paula Brown’s New Snowsuit by Sylvia Platt.’ I will investigate how the stories are similar and different, and also how they come across to the reader....   [tags: English Literature] 1401 words
(4 pages)
Strong Essays [preview]
Enaminone Derivatives - Introduction Enaminone derivatives are highly reactive intermediates extensively used for synthesis of otherwise not readily obtainable, heterocyclic compounds [1-4] and it can be used as starting material for the preparations of N-1 and /or N-2 substituted pyrazoles [29-31]. On the other hand a great deal of interest has been focused on the synthesis of the functionalized pyridine derivative owing to their biological activities [5-8]. In view of these observations and in continuation of our previous work directed towards development synthetic approach for the construction of biologically active heterocycles[9-12], we report herein a facile rout to various pyrazoles , isoxazoles, pyrimidine...   [tags: Chemistry ] 2461 words
(7 pages)
Powerful Essays [preview]
phase diagram - Introduction: Chemical equilibrium is a crucial topic in Chemistry. To represent and model equilibrium, the thermodynamic concept of Free energy is usually used. For a multi-component system the Gibbs free energy is a function of Pressure, Temperature and quantity (mass, moles) of each component. If one of these parameters is changed, a state change to a more energetically favorable state will occur. This state has the lowest free energy. When the free energy of all states are equal to each other, the system is at equilibrium....   [tags: Chemistry]
:: 5 Works Cited
2006 words
(5.7 pages)
Term Papers [preview]
Components in the Formation of Different Medicines - ... It can be a very fatal thing. Anxiety took over my life in many ways and without the medicine provided I would not have been able to take it. I would have had to go to therapy. Anxiety can be passed on generation to generation. It runs in my family so when I began to have family issues it was brought out a lot. Financial issues contribute to most people’s anxiety. It can in many cases break apart marriages, friendships, and families. My family had a combination of many things and this lead to my long journey of overcoming my personal issues with anxiety....   [tags: the history of chemistry] 810 words
(2.3 pages)
Better Essays [preview]
A Quick Look at Different Fuels and How They Work - ... You can still find them in cell phones, laptops, and other small devices, but until all tests and procedures are complete they will not be in vehicles or big equipment. The discovery of the hydrogen fuel cell was advanced almost directly from the natural resource of hydrogen and oxygen. Without these there would be no fuel cells. I believe this discovery will be a real breakthrough in society since the resources needed to fuel the cells are generally easy to come by. In my opinion, everyone eventually will convert to this in the future for better quality and more cost efficient in the long run....   [tags: history of chemistry] 899 words
(2.6 pages)
Better Essays [preview]
Temperature and its Effect in Enzyme Catalyzed Reactions - ... The first catalase ever to be noted as a substance was discovered in 1818 by Louis Jacques Thénard. He is the man who discovered hydrogen peroxide. He suggested that its breakdown was caused by a substance. In 1900, Oscar Loew was the first person to give it the name ‘catalase’, and also noticed that its presence was found in many plants and animals. Also, in 1937 the catalase enzyme from beef liver was crystallized by James B. Sumner and its molecular weight was worked out in 1938. (www.Chemistry explained.com; Chemistry Encyclopedia) Usually enzymes have three dimensional structure and always end with the letters 'ase'....   [tags: Cells, Chemistry] 557 words
(1.6 pages)
Strong Essays [preview]
Using Chemicals as Weapons in War - ... There were even more crude ways of spreading death; 1346 the Tatars catapulted plague-infected corpses into Italian trade settlements in Crimea. This is described has the first crude biochemical grenade. Even with these war tactics, the use of chemicals in battle didn’t become an extreme issue until 1914. In World War I the Germans introduce Mustard and chlorine gas; both of which are highly toxic if exposed for long periods of time (Grossman). Since these gases are heavier than natural air, they stay close to the ground....   [tags: history of chemistry] 993 words
(2.8 pages)
Better Essays [preview]
Taking a Look at Coordinating Compounds - ... In writing the formulae of metal complexes it's typical to incorporate the complete coordination complex within square brackets, an example being provided by [Co(NH3)5Cl]Cl2, during which the coordination complex is [Co(NH3)5Cl]2+ with two chloride counter ions. A ligand is an ion that is bound to central metal atom to form a coordination compound. These may be straightforward ions like Cl-, tiny molecules like binary compounds or NH3, larger molecules like H2NCH2CH2NH2 or N(CH2CH2NH2)3, or even macromolecules, like proteins....   [tags: dvandva, chemistry] 892 words
(2.5 pages)
Research Papers [preview]
The Chemical Weaponry Utilised In World War One and their Effects on Modern Ethics and Morals - World War One (1914-1918) remains, even today, one of the most infamous and controversial wars in the history of mankind, with a legacy that, through groundbreaking revolutions in chemical warfare, completely altered the way ethics and morals, as they relate to warfare, are perceived in modern society. The many countries involved in WW1 were the first to employ brutal weapons such as machine guns, torpedoes, tanks and zeppelins, weapons which had never been supplied to armies ever before. However, the greatest developments in weaponry of that time period, and arguably the most disputatious in regards to ethics and morals, were the momentous innovations that took place in the field of chemi...   [tags: War, Chemistry]
:: 3 Works Cited
1563 words
(4.5 pages)
Powerful Essays [preview]
alladium Catalyzed Suzuki Cross-Coupling Reactions and Their Uses in Organic Synthesis - Palladium Catalyzed Suzuki Cross-Coupling Reactions and Their Uses in Organic Synthesis Palladium catalyzed cross-coupling reactions are a useful way to create a new carbon-carbon bond in near quantitative yields and relatively moderate conditions.1,2 This makes them very useful tools in both organic and inorganic synthesis as well as materials research. The reaction itself was first discovered and researched almost simultaneously in the 1970’s by Dr. Akira Suzuki of Hokkaido University, Japan, Dr....   [tags: Sinthesis, Chemistry]
:: 6 Works Cited
1507 words
(4.3 pages)
Powerful Essays [preview]
The Life of Linus Pauling - The 20th century was filled with advancements in science and technology as chemists rapidly began introducing new techniques and discoveries into the world. Linus Carl Pauling is one of the most well recognized scientists of the 1900’s as his assortment of knowledge spread across many topics of science. Pauling was born in Portland, Oregon where he was forced to begin working at a young age of twelve due to his father’s death when he was merely nine. Although Pauling was often preoccupied with family responsibilities, he quickly realized his interest in the field of science....   [tags: biography, chemistry]
:: 3 Works Cited
1081 words
(3.1 pages)
Strong Essays [preview]
History and Uses of Aspirin - Topic Definition Aspirin was invented in late 1890s. More than a hundred years later, due to its fever-reducing and anti-inflammatory effects, it has become one of the world’s most extensively used medicines. Interestingly, this famous medicine, at the beginning, was invented by a German scientist in order to find out an effective remedy to cure his father’s pain. History Innovated by the fact that ancient people use willow bark to ease pain, the first chemically pure and stable acetylsalicylic acid was synthesized by a German chemist called Felix Hoffmann, in 1897 (Bayer AG, 2011)....   [tags: Chemistry, Prostaglandins]
:: 3 Works Cited
495 words
(1.4 pages)
Strong Essays [preview]
Biography of Dmitri Mendeleev - ... “He even predicted the likely properties of three of the potential elements. The subsequent proof of many of his predictions within his lifetime brought fame to Mendeleyev as the founder of the periodic law.”(Bensuade). The Periodic Law is the generic rule of the recurring pattern of elements found in the table due to their atomic number and weight. Dmitri’s education contributed to his discoveries towards the elements and the periodic table. Studying at the St Petersburg Institute of Pedagogy, Dmitri received his master’s degree in Organic Chemistry at the age of 22....   [tags: contributions to chemistry]
:: 4 Works Cited
615 words
(1.8 pages)
Better Essays [preview]
The Chemistry and Effects of Benzodiazepines (BZD) - ... temazepam as well as by oxidative N-dealkylation of alkyl group of the ring as in diazepam. Other metabolic pathway is the reductive reaction of the nitro group of benzodiazepine ring as in clonazepam. Generally, the oxidized metabolites underwent phase II conjugation with glucuronic acid to more polar compounds that are excreted in the urine as β-glucuronide metabolites. The triazolo- and imidazo- benzodiazepines such as triazolam showed different metabolic pathway in which a hydroxylation reaction occurs at CH3-group of the imidazole ring (figure 6)....   [tags: psychochemical properties]
:: 22 Works Cited
2649 words
(7.6 pages)
Research Papers [preview]


Your search returned over 400 essays for "Chemistry"
<< Previous  1  2  3  4  5    Next >>