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How Heat Affects the Speed of a Chemical Reaction

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HOW HEAT AFFECTS THE SPEED OF A CHEMICAL REACTION AIM My aim is to see if the change in temperature will affect the rate of reaction by carrying out a series of experiments. PREDICTION I predict that if I increase the temperature, then the rate of reaction will be faster and the lower the reaction, the slower the rate of reaction will be. I think the temperature is proportional to the rate of reaction. SCIENTIFIC KNOWLEDGE I believe that my prediction will prove accurate because I know from previous work that particles move at higher speeds when they are in higher temperatures. When the particles are introduced to a high temperature then they bump into each other more and with more force. A reaction will only occur when the particles collide. This is called the collision theory. The more often that particles with enough energy collide, the more the chemical reaction will take place. To measure rate of reaction we must measure the rate at which one or more of the products of the reaction is being formed. ...read more.


PILOT WORK The pilot work can be classed as a practise before we began to embark on the experimentation properly. I performed the experiment on only three temperatures. Here are the results: TEMPERATURE RESULTS 20 11 SECONDS 40 3 SECONDS 60 0.7 SECONDS Looking at the pilot work, I have chosen the temperatures between 20 - 70 in 10 degree intervals. I decided to stop at 70 because any rates of reaction after that would be too quick and to start before 20, then the rate of reaction would be too slow. METHOD * I filled two beakers. One containing sodium thiosulphate and the other hydrochloric acid. * Over the Bunsen burner, I separately heated the solutions to the desired temperature. * When both were at the correct temperature, I added both together into a different beaker and placed this beaker on the cross, whilst simultaneously starting the timer. * I stopped the timer once the black cross had fully disappeared because of the cloudy precipitate. RESULTS TEMPERATURE RESULT 1 RESULT 2 20 2 MINUTES 20 SECS 2 MINUTES 26 SECS 30 2 MINUTES 2 MINUTES 2 ...read more.


EVALUATION To have made my experiment better, I could have used a wider beaker. This would have made the experiment easier to witness but I do believe that if you increase the surface area, then you can increase the rate of reaction. Repeating the experiment would have also made more sure results. Another way of ensuring precision is if I had used an electronic water bath where then I could have made the temperature exact. Apart from welcome improvisations, I believe that my experiment went without difficulty and only minor problems were encountered. The main problem was that the solutions were not being cleaned well enough after one temperature. I also mixed the beakers a few times so twice a standing beaker with sodium thiosulphate or hydrochloric acid would begin to turn cloudy even before the mixing process had begun. Otherwise the experiment went according to plan, however think there would have been minor in corrections because there is no doubt I didn't pinpoint the exact moment that the black cross disappeared. I can conclude that there were no anomalous results, and I don't think there would be any outstanding variations in results, should I have repeated the experiment further. MARYAM HASSAN MRS BOWMAN CHEMISTRY ...read more.

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