CAIE A Level Chemistry 9701 · Chemical energetics
Entropy, , is defined as the number of possible arrangements of particles and their energy in a system.
Compare the entropy change, , for the following two processes. Predict the sign of for each process and explain your predictions, referring to the definition of entropy.
Process 1: Freezing of water at .
Process 2: The thermal decomposition of calcium carbonate:
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
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