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To investigate the factors that affects the rate of reaction.

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To investigate the factors that affects the rate of reaction Improving your scientific knowledge I am hoping that this experiment will increase my knowledge of many things to do with reaction. I should learn things like what affects the rate of reaction and how they can be changed depending on the variables. This extra knowledge will help me in many other areas of chemistry and hopefully be able to write up a detailed investigation for every other investigation I do. The key factors There are many key factors which can alter the results in my experiment. These are called the altered variables. The factors which I will keep the same throughout the experiment are the fixed variables. The first altered variable could be the temperature of the liquids. The temperature can greatly affect the rate of reaction. An example of this is when water is heated it speeds up the boiling of the water into gas. I can also alter the volume of each liquid, which could either greatly increase the rate of reaction or do the opposite and slow it down. ...read more.


This should make the results as accurate as possible and not create any anomalous results. I will make it a fair test by making sure I keep to the stated volumes of each substance and that I do not change any of them. I will also wear safety goggles to make sure that I do not get any of the substances in my eyes. Prediction I predict that the less sodium thiosulphate you use in the experiment the slower the reaction will be and vice versa. I believe this because I found out that the volume of a substance can greatly affect the rate of reaction and usually the more of the substance you use the quicker the rate of reaction will be. Preliminary Experiment I did the experiment first to test the extreme values (the highest and lowest volume of the sodium thiosulphate). I found out that the volumes were suitable for the experiment because the highest value only had a rate of reaction of about 2 minutes 20 seconds, which is about long enough for each test. ...read more.


My results are still very reliable even though I only repeated them once. I think that I would have to research a lot more variables and do a lot more experiments to get enough evidence to back up my conclusion. To improve my results I could use far more accurate measuring cylinders and repeat the experiment a lot more times. I think that if the experiment was repeated than there would be a 75% chance that I would get the same results. This is because a lot of my results from the two experiments are very similar or even the same. I could easily find out what other factors affect the rate of reaction. If I could do one of them I would do a full experiment on how the temperature would affect the rate of reaction. To do this I would need to use heating equipment and heat the five conical flasks, with the exact same volumes of the solution in, to five different temperatures and find out which one was the longest and which on ewas the shortest. This could help me find out how to make my experiment more accurate because if the room temperature changed than it could have affected my results. ...read more.

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