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Disappearing cross - Planning Aim To investigate how temperature affects the rate of the chemical reaction: Sodium thiosulphate + hydrochloric acid › sodium chloride + water + sulphur + sulphur dioxide Na2S2O3 (aq) + 2HCl (aq) › 2NaCl (aq) + H2O (l) + S (s) +SO2 (g) Scientific Principle - Collision theory Collision theory states that molecules must collide before they react. Not only must they collide but they must also collide with enough energy in order for a reaction to occur. The energy required for a successful reaction is called the Activation Energy. There are four factors that dictate the number of collisions and therefore the amount of successful reactions: * Temperature * Surface area * Concentration * The presence of a catalyst Our experiment aims to show how temperature affects the rate of reaction while the other factors remain constant. Equipment Glass beakers (100ml and 250ml) Measuring cylinders (10, 25, 100 and 250ml) Test tubes and boiling tubes Stirring rods Thermometers Stopwatches Water baths (30°, 40°,...

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