Describe how you would investigate the effect of temperature on the rate of a chemical reaction. Include the apparatus you would use.

To investigate the effect of temperature on reaction rate, I would use a water bath to control the temperature of the reactants. I would measure the time taken for a precipitate to form or for a color change to occur, using a stopwatch. The reaction could involve sodium thiosulfate and hydrochloric acid, where the time taken for the solution to turn opaque can be measured at different temperatures. This answer is anchored to AS required practical activities.

To investigate the effect of temperature on reaction rate, I would use a water bath to control the temperature of the reactants. I would measure the time taken for a precipitate to form or for a color change to occur, using a stopwatch. The reaction could involve sodium thiosulfate and hydrochloric acid, where the time taken for the solution to turn opaque can be measured at different temperatures. is the best answer because it directly supports the AQA A-Level Chemistry objective to required practical 3: investigate how rate changes with temperature. This reasoning is anchored to AS required practical activities in AS practical skills and required practical activities, and it separates required practical from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.