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Changing the rate of a reaction by changing the concentration:

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Introduction

Changing the rate of a reaction by changing the concentration: Introduction: There are three factors that affect the rate of the reaction and these are: * Concentration of the reactants: The more successful collision, the more the rate of the reaction. * Temperature: The more the temperature, more energy will be given to particles to move around so the more collision will happen. * Surface area: The more the surface area, the more rate of reaction (particles collide faster). When dilute hydrochloric acid is mixed with sodium thiosulphate solution, a fine yellow precipitate of sulphur forms. The rate can be followed like this: The following apparatus will be needed for this task: * Measuring cylinder * Conical flask * Stop clock * White paper * Marker Method: * A cross is marked on a piece of paper. ...read more.

Middle

* The clock is stopped the moment the cross can no longer can be seen from above and record the time. * Repeat the experiment several times using different concentrations (2%, 4%, 8%, 12% and 16%) of sodium thiosulphate. The temperature of each reactant is kept exactly the same each time. Only the concentration of sodium thiosulphate is changed. * Represent your results in a table. The first set of results: Concentration of sodium thiosulphate Time taken 2% 49.06 4% 47.77 8% 20.50 12% 12.38 16% 9.69 The second set of results: Concentration of sodium thiosulphate Time taken 2% 49.99 4% 43.94 8% 17.41 12% 11.99 16% 9.76 The average table: Concentration of sodium thiosulphate Time taken 2% 49.53 4% 45.86 8% 18.96 12% 12.19 16% 9.73 By looking at all of the ...read more.

Conclusion

Fair Test: To make the test fair, I did the experiment several times (as you can see I have two tables for two sets of results) and I made a separate table to find the average of the two tables which gives us clear understanding of the results and conclusion. So in this way my results are more accurate and reliable. Graphs for the results of the average table (XY Scatter): Another type of graph (line graph) for the average table: Improvement: To improve the test we can repeat the test several times. Foe example I have 2 sets of results, by repeating the test I will have more results which means I will have more clear idea about the results and the average will be more accurate and reliable. ?? ?? ?? ?? Alalea KIA 11ME Year 11 Assessment of Practical Skills ...read more.

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