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Find out how the temperature affects the rate of reaction.

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Investigation: Rates Of Reaction Aim: Our aim is to find out how the temperature affects the rate of reaction Research: Reference - Encyclopaedia 2002 Reaction, Rate of, amount of a substance that takes part in a chemical reaction in a given time. Chemical reactions happen at widely different rates. The weathering of buildings and statues caused by acid rain is very slow, but the reactions that take place when a firework explodes are very fast. Most reactions take place at a rate somewhere between that of a firework explosion, which is almost instantaneous, and that of weathering stone. Finding out how quickly reactions take place and understanding why they happen at the rate they do is very important to the chemist. Speeding up useful reactions and slowing down harmful ones can be important in industrial production processes, and in activities such as preserving buildings or foodstuffs. ...read more.


If it is cooled, it takes longer to become cloudy. The rate of a reaction can be obtained by following some measurable property that alters as the reaction occurs. Examples of such measurable properties include gas volumes, concentration of reaction mixture, and electrical conductivity. 2HCl + Na2S2O3 2NaCl + S + SO2 + H20 Prediction: I predict that as the temperature is increased the rate of reaction will increase. I also predict that as the concentration of the sodium thiosulphate increases the rate of reaction will increase. Key Factors: * Temperature * Concentration * Time Independent Variable: The temperature Dependant Variable: The time Control Variables: * The concentration * The amount of sodium-thiosulphate solution put into the flask * The amount of dilute hydrochloric acid put into the flask Collision Theory: Before we can get a chemical reaction, particles must crash together. ...read more.


20 (Room temp) 128 30 51 40 30 55 23 70 8 80 4 Graph Of Results: Evaluation: I don't think my results were reliable enough to draw an accurate conclusion to how temperature affects the rate of reaction, however they did prove my basic theory. To improve my results I could have done more preliminary work to make sure my method was as accurate as possible and that I was more familiar with doing the experiment. If I was to extend the experiment I could try seeing how different variables affect the rate of reaction, for example the concentration of acid. Before doing this, I think it would be a good idea to repeat the experiment investigating temperature to improve my results. Conclusion: From my results I can see that my prediction was correct and the time it took for the cross to disappear did decrease as the temperature was increased. I could carry on past 80� to see if the trend continued but it would eventually become too difficult to get an exact time. ...read more.

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