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How temperature effects the rate of reaction.

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Investigation: How temperature effects the rate of reaction. Plan: We must produce a piece of coursework investigating the rates of reaction, and the effect different changes have on them. The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. It is measured by dividing 1 by the time taken for the reaction to take place. There are five factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface are (of solid reactants), and catalysts. I have chosen to investigate the effect of the temperature on a reaction. This is because it is the most practical to investigate. It would take longer to prepare a solid in powdered and unpowdered form, and it is difficult to get accurate readings due to the inevitabilities of human errors, and as gas is mostly colourless it is difficult to gauge a reaction changing the pressure, and if a substance is added to give the gas colour, it may influence the outcome of the experiment. ...read more.


If the frequency of collisions is increased the rate of reaction will increase. However the percent of successful collisions remains the same. An increase in the frequency of collisions can be achieved by increasing the concentration, pressure, or surface area. Apparatus: 1 Hydrochloric Acid 2 Sodium Thiosulphate 3 2 measuring cylinders 4 2 test tubes 5 Thermometer 6 Stopclock 7 Conical flask 8 Lab coat 9 2 beakers 10 Piece of paper with a black cross on it 11 Ice 12 Test tube rack 13 Water bath Method: 1. Put lab coat on. 2. Retain your equipment. 3. Get 2 beakers; fill one up with Sodium Thiosulphate and fill the other one with Hydrochloric Acid. 4. Measure 103 of each of them using separate measuring cylinders. 5. Put the solution into separate test tubes. 6. Get the conical flask ready with the piece of paper, with the cross on it, at the bottom of it. 7. Put the solution in it and start the stopclock. 8. Stop the stopclock when the cross on the paper is no longer visible. 9. Record how many seconds it took. ...read more.


In the temperature experiment the time taken for a reaction to take place decreased by roughly 10 to 15 seconds for every 10�C increase in temperature, with the one anomaly being the 30�C reading. There is also a trend in the increase in rate of reaction as the temperature increases. Using the graph, with lines of best fit, I can draw a conclusion from my experiment. The graph for the temperature experiment has a steep curve meaning that the decrease in time taken for the reaction was rapid. Naturally, the above means that the graph plotting the rate against temperature has a positive correlation as the temperature is increased so does the rate of reaction. This is because when the temperature is increased the particles will have more energy and will move faster. Conclusion: My prediction was right because of the evidence on my graph and table. I had a few mishaps throughout my journey but I overcame them. This experiment took place for about two weeks and coming to the end I was getting a bit frustrated and bothered but I dealt with it. I think my experiment was successful because I have a good insight on the rates of reaction now. ...read more.

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