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Investigating Rates of Reaction
Member rating: No Rating | Words: | Submitted: Thu Jul 11 2002
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Investigating Rates of Reaction Tom Lorber 11Lt Chemistry Coursework 2001 Contents Page Number 1. Planning 3 2. Method 6 3. Obtaining Evidence 9 4. Analysing Evidence 10 5. Evaluation 12 Investigating Rates of Reaction Planning I have been asked to investigate the variables that affect the rates of reaction. I will test the reaction between hydrochloric acid and sodium thiosulphate solution. This is a precipitation reaction. They react as in the below equation: sodium thiosulphate + hydrochloric acid -> sodium chloride + water + sulphur dioxide + sulphur Na2S2O3 (aq) + 2HCl (aq) -> 2NaCl (aq) + H20 (l) + SO2 (g) +S (s) The appearance of the insoluble sulphur when they react makes the mixture cloudy. The cloudiness increases as the reaction is allowed to proceed. Chemical reactions only occur when particles of the reactants meet and combine. This is known as the collision theory, which states that, the rate of any step in a reaction depends on the frequency of collisions between the particles involved in that step. It follows that where the concentration...
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