The aim of the experiment is to find out the effect of different
concentrations of reactants on rate of reaction.
Rates of Reaction
Aim
The aim of the experiment is to find out the effect of different
concentrations of reactants on rate of reaction. I will find this out
by doing an experiment. The reaction that will be used is: Sodium
Thiosulphate + Hydrochloric Acid
Na2S2O3 + 2HCl
Equipment
The equipment I will use to do this experiment is:
· Goggles
· Test tubes
· Beakers
· Hydrochloric Acid
· Sodium Thiosulphate
· Water
· X marked paper
Background Information
The Collision Theory is when particles collide with enough energy to
break their bonds if they are to react. Collision means when two
particles hit each other. Breaking a solid exposes new surfaces, the
smaller the pieces the greater the surface area.
Safety Measures
A pair of goggles will be worn in order to protect the eyes.
Fair Test
In order for my findings to be valid the experiment must be fair. I
will use the same standard each time for judging when the X has
disappeared. I will make sure that the measuring cylinders for the
Hydrochloric acid and Sodium Thiosulphate will not be mixed up. The
amount of Hydrochloric acid will be 10cm3 each time.
Prediction
I predict that by increasing the concentration of one of the reactants
the rate of reaction will increase because they are likely to collide
quicker.
Method
I first of all start of by wearing goggles as Hydrochloric Acid is an
irritant to the eyes. After that I got all equipment out I needed to
perform this experiment.
Test Tube Beaker X marked paper
I firstly put 10cm3 of hydrochloric acid into the beaker which I
measured with the test tube. After I put the x marked paper under the
beaker. I then poured in the volume of Sodium Thiosulphate and the
concentration of it which was 50cm3. Set off the stopwatch and waited
to see when the x marked paper is not visible. I repeatedly did this 3
times for each one. Finally, I recorded the results on a results
table.
Conclusions
My results show that if you add more concentration of sodium
Thiosulphate and less water to the hydrochloric acid the particles
collide more because so the rate of reaction increases. When I
repeated my results and experiment the times were similar meaning that
I was very accurate with my experiment and judgement.
Evaluation
I only really encountered one problem which was do the experiment in
the amount of time that was given to us and Sodium Thiosulphate ran
out during the experiment but that was quickly resolved as borrowed
some of my friend who is also doing the experiment.
Half fill the ... ... middle of paper ... ... e data quality. Furthermore, using a graduated cylinder with markings below the 100 mL line would have allowed for more accurate measurements of the initial volume of air in the graduated cylinder.
The Daphnia magna species in this experiment were kept and preserved in jars of suitable water that acted as small ponds. Each Daphnia Magna was transported individually using a wide-mouthed pipette to a depression slide. The stability of the Daphnia Magna on the slide was attained by using a drop of pond water that acted as a boundary of movement for the Daphnia on the depression slide, small pieces of cotton wool were also used to act as an extra boundary to stop the Daphnia Magna from swimming in circles in the pond drop it was placed in; the stability factor was important in counting the heart beat rate more accurately. The depression slide was then placed under the stereomicroscope, over a cooling chamber that was used to slow down the
Cu (aq) + 2NO3 (aq) + 2Na+ (aq) + 2OH- (aq) → Cu(OH)2 (s) + 2Na+ (aq) + 2NO3(aq)
The purpose of the experiment is to determine the ID of an unknown diprotic acid by establishing its pKa values. The first phase is to determine the unknown diprotic acid by titration, which is a technique where a solution of known concentration is used to determine the molecular weight. While the second phase involved seeing how much NaOH needed to standardize diprotic acid.
Experiment #1: The purpose of this experiment is to investigate the effects of baking soda and light intensity on the rate of photosynthesis of green spinach leave through the observation of floating disk.
quarter of the page and is used to catch the eye of the reader. The
The 1970s was a tumultuous time in the United States. In some ways, the decade was a continuation of the 1960s. Women, African Americans, Native Americans, gays and lesbians and other marginalized people continued to fight for their freedom, while many other Americans joined in the demonstration against the ongoing war in Vietnam. Due to these movements, the 1970s saw changes in its national identity, including modifications in social values. These social changes showed up in the fashion industry as well, delivering new outlooks in the arenas of both men’s and women’s clothing.
If we didn’t have fashion then a lot of people wouldn’t have jobs because there are a whole bunch of fashion designers out there, also all of the celebrities wouldn’t have name brand clothing because there would be no way to make them because we wouldn’t have designers. Fashion of the 1920’s played a very big role in today’s fashion. Including the material our clothing is made out of also the styles of clothing we wear. Many things women wear today first came from fashion in the 1920's. Flappers, shoe styles, and accessories are a few things that we wear today have came from. Many celebrities still wear some things that people wore in the 1920's including flappers. Have you ever wondered what the amazing fashion of the 1920's was like?
The world of ethics and moral understanding of medicine was turned inside out as human rights were disregarded in an attempt to understand the anatomy of the human body, as well as its various responses to different drugs and environments. Human experimentation and subject research were of little interest to society before the 20th century (“Human Experimentation, Plutonium, and Colonel Stafford Warren”). The onset of the Holocaust heightened the popularity of that medical field. Experimentation using human subjects has drastically changed from the 20th to 21st century regarding the consent and state of the subject, the intent of the experiments, and the laws and policies passed.
To begin with, Lord of the Flies is set on an untouched, what is perceived as holy, island. This is a parallel to the Garden of Eden which was paradise to Adam and Eve. In the beginning, Adam and Eve are enjoying Eden and taking in all its pure beauty, much like the boys in the novel. Ralph perceives the island as a sort of utopia, as Golding wrote “…he sat back and looked at the water with bright, excited eyes.”. The Garden of Eden was perfect and no evil was in the world at this time, which is also how the island was at the beginning. Again relating to the perfection of the island, Golding says “They accepted the pleasures of morning, the bright sun, the whelming sea and sweet air...” It’s also important to note that Golding when speaking of Ralph says “He undid the snake-clasp of his belt …and stood there naked, looking at the dazzling beach and the water.” This could be an allusion to how Adam and Eve felt no shame in the state of bareness in their pure society. The Garden of Eden was a place of innocence, despite the evil located at its roots. When Adam and Eve were faced ...
At the beginning of the story, after the plane had crashed on the island and the boys are accounted for, Ralph feels very free and absent. He finds a lagoon to with warm water, and just like any other twelve year old boy, he goes for recreational swim. "Whizzoh! . . . Ralph inspected the whole thirty yards carefully and plunged in."(12) So far, not terribly worried yet, about being rescued and getting off the island. Along with him being fairly rel...
Egg Albumen Experiment The purpose of this investigation is to establish which is the lowest concentration of Copper (II) Sulphate solution that will denature a sample of egg albumen (egg white) at room temperature. The base of the reaction is the globular protein (albumen) being denatured by a heavy metal (Copper (II)), the copper (II) reacts with the NH3 group causing it to denature, this means the proteins' secondary and tertiary structures are being altered and refolding into different shapes, this resulting in a change from the substance being clear to turning opaque.[1] As the concentration of the denaturants increases more folding and changing of shape will occur and therefore more denaturing will occur and at a faster rate. From this I can predict that that lowest concentration of the solution is approximately at 0.03m solution.
In conclusion, Fashion will always transcend throughout the ages. Fashion is a form of expression, an art form if you will. The 1950’s will always be a foundation for the fundamentals of fashion. What someone has created will repeat itself in history, even if it unknowingly was a symbol meant for prosperity when in this day and age it stands for
Focusing on the development of a fetus, there is a lot to acknowledge. The reproduction system is detailed and pregnancy can be compromised easily. As a female who may eventually want to reproduce, the topic of pregnancy is generally interesting. There is a vast amount of information based on pregnancy and fetal development, however I would like to focus on birth defects. Birth defects can arise from several factors such as genetics, teratogens, and prenatal infections.
During prenatal development, the mother's general health and age is very important. Nutrition, anxiety, and stress are a big part of the physical development during the prenatal stages. Referenced by Eysenck & Schoenthaler (1997) in our text, “A rapidly growing body of evidence reveals that when food sources are short on protein or essential vitamins and minerals during prenatal and early postnatal development, an infant’s physical, socio-emotional, and intellectual development can be compromised” (as cited by Broderick & Blewitt, 2010, p. 56).Genetic and chromosomal problems can begin at conception. Many disorders can be transmitted through the operation of dominant and recessive genes. Most recessive disorders are diagnosed in early childhood. Some genetic disorders include the following: sickle cell disease, hemophilia, night blindness, cystic fibrosis, extra fingers, high blood pressure, and huntington's disease. Chromosomal errors also effect the prenatal development stage. The most common is Down syndrome, in which a child has 3 copies of chromosome 21. The risk of bearing a child with this condition depends on the age of the mother.