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How does changing the temprature effect the rate of a chemical reaction?

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Introduction

How does changing the temprature effect the rate of a chemical reaction? My experiment will involve heating a test tube of sodium thiosuulphate and hydrocloric acid. A bunsen burner and a water bath will be used to heat the two chemicals. The bunsen burner will be on a heat proof mat and we will also wear goggles for saftey. The person that looks down the flask and stops the clock each time will be the same. The same equipment for carrying each chemicals will also be used for fairness, my prediction is that the hotter the two chemicals are, the quicker the reaction will happen. With more heat the particles will move around more, causing a faster reaction. ...read more.

Middle

keep the same test tubes flask bunsen burner tripod water bath heat proof mat clock person who starts and stops clock thermometer cross on cardbooard concentration The values i am using are (temprature): 25� 30� 35� 40� 45� 50� 55� 60� Preliminary Expiement When we mixed together the hydrochloric acid with the sodium thiosulphate the water turned cloudy. The black cross was no longer visiable. The higher the concentration of thiosulplate, the quicker the reaction. Presice Results We measured the temprature to the nearest 0.5� We measured the time to 1 d.p. We did the expeiment 8 times with differnet tempratures for reliable and accurate results. Preliminary results Results I have found out that the higher the temprate of the thiosulthate and hydrocloric acid, the faster the reaction takes place. ...read more.

Conclusion

The collision theory states that if a solution is made hotter it means that the particles will move faster causing them to collide more. I did some further research and in the book Chemistry by J A Hunt and A Sykes it says that for every chemical reaction, there is a certain minimum energy needed in the collisions before a reaction can occur. This minimum energy is called the activation energy of the reaction. Improvements Possible problems with my coursework could have been the caused by human error. Firstly, there could have been error in stopping the stopwatch, although this would have been minimal. The chemicals could of also been measured incorrectly. Overall, however, I think that this experiment has been successful because my prediction has been accurate which shows that the results are accurate. I have also made sure that the test was done fairly. ...read more.

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