What is the significance of using a polystyrene cup in measuring enthalpy changes during a reaction?

A polystyrene cup is used because it is a good insulator, minimizing heat loss to the surroundings. This ensures that the temperature change measured reflects the actual heat change of the reaction, leading to a more accurate calculation of the enthalpy change. This answer is anchored to AS required practical activities.

A polystyrene cup is used because it is a good insulator, minimizing heat loss to the surroundings. This ensures that the temperature change measured reflects the actual heat change of the reaction, leading to a more accurate calculation of the enthalpy change. is the best answer because it directly supports the AQA A-Level Chemistry objective to required practical 2: measure an enthalpy change. 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.