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The aim of this coursework is to investigate how the temperature can affect the rate of reaction. I will use sodium thiosulphate and hydrochloric acid as the reactants of the experiment, and then vary the temperature to see the speed at which they react.

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Introduction

Chemistry Coursework Rate of Reaction Candidate name: YangMei (Juliana) Plant 11K Candidate number: 8087 Rates of reaction Aim: The aim of this coursework is to investigate how the temperature can affect the rate of reaction. I will use sodium thiosulphate and hydrochloric acid as the reactants of the experiment, and then vary the temperature to see the speed at which they react. Scientific Background: The rate of reaction is the speed at which a chemical reaction takes place. The rate at which the reaction takes place cannot be worked out from its chemical reactions, but by measuring how much reactant is used up in a certain time, or how much product is formed at a certain time. Whatever the matter, the amount of product formed at the end of the experiment should always equal to the amount of reactants at the start of the experiment, because all chemical equations are balanced even when the product is invisible. The product of a chemical reaction is never disappeared but transferred to another state, such as from a liquid to a gas. The rate at which a chemical reaction takes place can vary greatly, such as from extreme explosions to slow rusting. ...read more.

Middle

* Use the same volume of concentration throughout the whole experiment. Prediction: Since the rate of reaction is the speed at which a chemical reaction takes place, I predict that if I increase the temperature of the reaction, the speed at which the reaction is going to occur will also increase. This is cause by the molecules becoming thermally active, which increases the collisions between particles and so the bonds breaks more quickly. This increase of speed at which the bonds break also increases the reaction, so the speed at which the reaction takes place in a given time accelerates. On the other hand, if the temperature decreases then the rate at which the reaction takes place will also decrease because there are no movement/ collisions amongst the molecules to create enough energy to break the energy barriers to start a reaction, in other words there is not enough kinetic energy to break the existing bonds between the molecules. In this case the reaction will only take place when hydrochloric acid is added to the sodium thoisulphate, as sodium is alkaline when it mixes with the hydrochloric acid an exothermic reaction takes place. ...read more.

Conclusion

disappear sec 20 1.08 25 35 30 25 35 17 40 15 45 13 50 12 Evaluation: I have added water to the solution to make it more dilute, the readings did indeed became more spread out. Since I have diluted the solution to a half, the time taken for the cross to disappear should now double, but according to the table only a few did e.g. at 20 c. This shows that some errors have occurred in the experiment, which is why the readings don't match. It could be that the stopwatch was started late or some careless mistakes made by me. I have to take this into account when I do my final experiment. The accuracy of the results could be improved further if I have recorded the readings to 2 decimal places instead of none at all. By recording it to 2 decimal places the results are more likely to be more accurate as it involves more detailed. Final Experiment Volume of concentration: 40 ml water 10 ml sodium thoisulphate Temperature c Time for cross to disappear sec 0 8.13 5 7.22 10 5.31 15 4.21 20 3.04 25 2.31 30 1.40 35 1.05 40 0.55 45 0.37 50 0.25 ...read more.

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