Measuring enthalpy changes of reactions
2 marks · NormalA student adds dilute hydrochloric acid to sodium hydroxide in a polystyrene cup. The temperature of the mixture rises.
State the name of this type of experimental method, and state the reason a polystyrene cup is used.
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Also accept: insulated cup; insulated container
Common mistakes: thermochemistry for the method; to increase heat loss
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Marking points
B1 · 1 mark · Name given as 'calorimetry' or 'calorimetric experiment'
B2 · 1 mark · Reason related to reducing heat loss (e.g. polystyrene provides insulation/reduces heat transfer to surroundings)
Worked solution
The method is called calorimetry.
A polystyrene cup is used because it acts as an insulator to reduce heat loss to the surroundings.