Introduction: Double displacement reactions have many applications and can be found in both nature and in a lab. Scientist often need to produce new materials using double displacement reactions. The equation for double displacement reactions is:
AB + CD -> AC + DB
A double displacement reaction results in 2 new compounds which are classified as the products. The reactants are the compounds before undergoing a chemical reaction. The cations and anions of each compound found in the reactants are being rearranged to form two entirely different compounds. The driving force that causes this and all types of chemical reactions is the collision reaction theory. The collision reaction theory states that when chemicals mix, the chemicals will collide. If the chemicals collide at the proper speed and position, the result will be a breaking of the previous bonds and formation of new bonds. Therefore in a double displacement reaction chemicals AB and CD will first split apart, and during the rearrangement they will form AC and DB.
Often times these double displacement reactions will result in the formation of a precipitate. A precipitate is defined as the creation of a solid with a solution. A solution is a homogeneous mixture of two or more substances. Solutions are commonly an ionic or molecular compound that has been dissolved/dissociated in water. In ionic compounds the water enters into the spaces within the crystal lattice structure and weakens the forces holding the molecule together. This causes the ions to completely dissociate from one another and allows for them to rejoin to other ions not found in the original solution. One is able to predict the formation of a precipitate ...
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...of chemicals only to have a large amount being wasted.
This lab determines the percentage yield of a double displacement reaction between 2.00g of strontium chloride(s) and 2.00g of copper (II) sulfate pentahydrate(s). The two chemicals were added to 40 ml of water then mixed together in order to undergo a chemical reaction. After adequate precipitate had been formed, the solution was then passed through filter paper in order to separate the solid precipitate from the original solution. Once passed through the filter paper with the solid precipitate was removed then left to dry. After it had been dried it was then weighed, and the mass of the precipitate was determined. Using stoichiometry one was able to determine the limiting reagent and the theoretical yield. Finally the percentage yield was calculated using the mass of the precipitate and the theoretical yield.
...form 〖PbCrO〗_4 and then process it through a filter. After filtering the 〖PbCrO〗_4 I had to dry the 〖PbCrO〗_4 residue in the drying oven for 30 minutes at 80℃. Then let it cool for 5 minutes and weigh it and finally make a few calculations to obtain the theoretical, actual, and percent yields of 〖PbCrO〗_4. I was able to fulfill the experiment because I obtained all the answers to the equations in an accurate amount. I believe this experiment was a success due to my hypothesis of, If physical methods are used to separate 〖 PbCrO〗_4 precipitate from the reaction mixture then I can successfully calculate the theoretical, actual, and percent yields, being correct.
Abstract: This week we experimentally determined the rate constant k for the reaction 2HCl (aq) +Na2S2O3 (aq) → S (s) + SO2 (aq) + H2O (l) + 2NaCl (aq). In order to do this the average reaction time was recorded in seconds during two trials. The data from the experiment shows this reaction is in the first order overall: rate=.47s-1 [HCl]0 [Na2S2O3]1. These findings seem to be consistent with the expected results
An elements¡¦ reaction to certain substances may be predicted by its placement on the Periodic Table of Elements. Across a period, an element on the left will react with more vigor than one on the right, of the same period. Vertically, as elements are sectioned into groups, the reaction of each element increases as you move down in the same group. With this in mind, the reactions of the substances involved in this experiment may be hypothesized, observed, and validated.
reaction is the rate of loss of a reactant or the rate of formation of
A double replacement reaction, also called a double displacement reaction, is a type of chemical reaction in which two compounds react, and the anions and cations of the two reactants switch places to form two new compounds (products). A general equation for a double replacement reaction would be: AX + BY → AY + BX, along with any states of matter subscripted after each compound. Simply put, a double replacement reaction is the exchange of positive ions, or cations, between two compounds to form two new compounds. A precipitation reaction is a double replacement reaction in which two aqueous reactants
The purpose of this lab was to to cycle solid copper through a series of chemical forms and return it to its original form. A specific quantity of copper undergo many types of reactions and went through its whole cycle, then returned to its solid copper to be weighted. We observed 5 chemical reactions involving copper which are: Redox reaction (which includes all chemical reactions in which atoms have their oxidation state changed), double displacement reaction, precipitation reaction, decomposition reaction, and single displacement reaction.
reaction is the rate of loss of a reactant or the rate of formation of
As you may know, when you mix baking soda and vinegar there is a big reaction, but have you ever wondered how this reaction happens? Well in order to find out how it happens you will need to know the elements that make up baking soda and vinegar. You will also learn why these elements are where they are on the periodic table and what is released during the baking soda and vinegar reaction.
This report discusses several different types of chemical reactions that were conducted in a lab. A chemical reaction is when two or more chemicals interact to form a new substance or rearrange the molecules within the substances. There are many signs that indicate when a chemical reaction has occurred. These changes include: a colour change, a gas being formed, a solid being formed, a change in temperature, precipitates are formed, a change in smell, light being emitted, a change in mass or volume, a change in conductivity, a change in boiling and/or melting point, and a change in taste. In the lab, thirteen different chemical reaction were conducted. Five of these reactions were single displacement reactions. A single displacement reaction is a reaction in which an element
The reaction between and KCl is a double replacement reaction because the cations Cu2+ and K+ switched places and formed two new compounds, copper (II) chloride and potassium nitrate. However, there was no observed precipitation in the resulting solution as both are soluble.
In the book, “The Element” by Ken Robinson he discusses how different education systems all over the world are but focuses on the education system in the United States. The reason being is that he believes that there are faults that need to be fixed because it doesn’t focus on the students individually and discovering their “element” but, on academics, business and state testing. Robinson claims that education itself is supposed to be a process in which it develops all resources.
The Double Helix tells a tale of fierce competition, perseverance, and scientific innovation as we follow James Watson and his cohort Francis Crick on their quest to discover the secret to life, the structure of deoxyribonucleic acid. Although already fascinated with DNA, Watson struggled with finding chemistry exciting enough to learn it in depth. He had studied birds in college and thereby managed to avoid any formal chemistry or physics courses. As he later pursued a PhD in biochemistry, he realized he could put it off no longer and attempted to learn organic chemistry at Indiana University. However, after a mishap in the lab, he was encouraged instead to study nucleic acid chemistry with Herman Kalckar in Copenhagen. There, his mind strayed from his work and he began doing unauthorized research in the lab of Ole Maaløe, studying phages. Herman stopped teaching Watson after going through a divorce with his wife, and sent Watson off to a scientific conference in Naples. Although he was bored by many of the lectures, Maurice Wilkins’s talk about X-ray diffraction fascinated Watson. He was struck by an X-ray diffraction picture of DNA that Maurice presented and was determined to study the acid. He later got to know more about Maurice’s colleague, Rosalind Franklin, who was proud, stubborn, and very difficult to work with. Watson greatly admired the lecture given by the renowned Linus Pauling, who had discovered the structure of the alpha-helix and was thought of as the leader in DNA research in the scientific world.
A precipitation reaction can occur when two ionic compounds react and produce an insoluble solid. A precipitate is the result of this reaction. This experiment demonstrates how different compounds, react with each other; specifically relating to the solubility of the compounds involved. The independent variable, will be the changing of the various chemical solutions that were mixed in order to produce different results. Conversely the dependent variable will be the result of the independent variable, these include the precipitates formed, and the changes that can be observed after the experiment has been conducted. The controlled variable will be the measurement of ten droplets per test tube.
3TiO2 (s) + 4C (s) + 6Cl2 (g) ↔ 3TiCl4 (g) + 2CO2 (g) + 2CO (g)
This form of chemical reaction is known as a single displacement reaction and is exothermic. The reaction is irreversible and is written as: