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Investigating how changing the temperature affects the rate of reaction.

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By Danielle Choyen 11 Miranda Investigating how changing the temperature affects the rate of reaction. Aim: My aim is to investigate how the temperature of sodium thiosulphate and hydrochloric acid changes the behaviour of the solution. Hypothesis: I predict that if the temperature is heated, the reaction will take place in a faster period of time. This is because in the dilute hydrochloric acid, there aren't many particles, however, when it is heated, the particles vibrate and move around more - in other words, the particles are gaining energy. The Effect of Temperature: When particles are heated up, they have more energy meaning they move around quickly. As they travel faster, there are more collisions in the time. Therefore as we raise the temperature, reactions get faster, whereas if we lower the temperature, the reactions take place slower. This is shown in the diagram below: This diagram shows the reactions the particles undertake as the temperature rises. The collisions become greater as seem in three sets of particles. Fair Test: In order for me to make my experiment a fair test, I must ensure that a number of things are correct: I must ensure that the exact and equal amount of Sodium Thiosulphate and Hydrochloric Acid are put in the flasks at every experiment. ...read more.


For room temperature, I simply poured the Hydrochloric Acid into the Thiosulphate solution which was already on the X Card. I immediately began the stop clock and waited until I could no longer see the "X" at the bottom of the beaker. Once the "X" had disappeared completely, I stopped the stop clock and recorded my results. I then washed out all the equipment I used thoroughly ready to use it again for the next experiment. This is shown in a diagram below. For 0*C, the same method was used as room temperature, except once I put the Thiosulphate Solution into the beaker, I put it in a bucket of ice with a thermometer in it and waited until the temperature reached 0*C. I then brought the beaker back onto the "X" Card and added the Hydrochloric Acid. Again, I timed how long it took for the "X" to disappear. This is shown in the diagram below. For the heated experiments, I prepared the Hydrochloric Acid in the beaker and put in on a Bunsen Burner to heat. I had a thermometer in the beaker and once the Hydrochloric Acid had reached my desired temperature, I took it off put it on the "X" Card and added the Thiosulphate solution. ...read more.


This could have allowed the solution to slightly cool, making my experiment not as reliable as they should have been. For my coursework, in order to make my results more accurate, I could have repeated my experiments more than twice to ensure that my rule of when temperature increases rate of reaction is quicker. I also could have used different equipments in order to make my results more accurate. By using a more enhanced form of technology, my results could have been better scientifically proven. Conclusion: In conclusion, from doing the practical experiment, I have realised that my hypothesis is correct. As we increase the temperature of the solution, we increase the rate of reaction. When we raise the temperature of the solution, the heat causes the particles of solution gain more energy. This causes them to move around more vigorously, colliding with each other. The more heat that is giving these particles energy, the quicker the reaction will be as the collisions will be greater. This is shown by the obvious pattern in my results. Overall, I am very pleased with my results. Danielle Choyen 11 Miranda ...read more.

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