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Rate Of Reaction

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G.C.S.E Practical Investigation KS4 Sc. 3 Chemistry Rate Of Reaction The aim of this investigation is to find out what controls the rate of reaction. The key factors that control this are: * Concentration * Temperature * Surface Area * Catalysts In this investigation I am going to look at the temperature factor. The effect of temperature on the rate of reaction should be that it effects the speed of the reaction. So if the temperature is 40(C, the reaction should be twice as fast as a reaction that takes place at 20(C. The reason for this is that the molecules will gain twice as much energy and will therefore move around twice as fast. The chance of the molecules colliding will be greatly increased due to this. To help me with my practical, I conducted a preliminary test. The reason for this was to help me find an appropriate temperature range and chemical combination. To test the temperature range, I listed temperatures, going up in tens, starting at 20(C and ending at 80(C. This is because I wanted a range using six temperatures but I was unsure of whether to use a high temperature or a lower temperature. So, I then took the lowest temperature and the highest temperature and tested them to see how fast they reacted. First of all I tested 20(C. ...read more.


After placing a thermometer in the beaker with the boiling tubes I began to heat them with the Bunsen burner. When the water reached 30(C, I removed the boiling tubes from the water and poured them into the conical flask. Using the stop-clock, I timed how long it took for the black cross to disappear. I recorded the time on the stop clock into my exercise book. I then washed the two boiling tubes and the conical flask. I repeated this method for each temperature, recording the results as I went along. Each time I increased the temperature by 10(C until I reached 80(C. To make results accurate I will use exactly the same chemicals and amounts. I will keep my method the same and I will wash out the conical flask and the boiling tubes after each test. By doing the above, my practical will also be a fair test. I will need to make sure that each factor is kept the same and that the only factor that will be changed is the temperature of the chemicals. To make sure that my practical is safe at all times, I will need to wear goggles throughout the practical, use test tubes holders to pick up the boiling tubes when they have been heated and I must make sure that my Bunsen burner is never left unattended. ...read more.


To improve my experiment so that this won't happen again, I could put the thermometer into the boiling tube instead of the beaker with water in it. This will help me make sure that the temperature of the chemicals is the same as the temperature of the water. This will also help me make sure that the chemicals are at the correct temperature. Even though I had an odd result, my results were good enough to form a firm conclusion. I know this because the trend in my results showed me that my prediction was correct and it can be supported with my scientific knowledge. This means that I can confidently say that my experiment helped me prove that the rate of reaction can be increased if the temperature of the substances used is increased. To make sure that my results were reliable I compared them with a similar experiment. By doing that I found that my results were reliable because they were very similar to the results of the other experiment. To back up my results I could have done some extension work. I could have done another experiment, this time using a different method or using different chemicals. For example I could have reacted hydrochloric acid with magnesium ribbon. I could have heated the hydrochloric acid and measured the amount of gas that is produced from the reaction using a gas syringe and timing how long it took for the amount of gas to be produced. ...read more.

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