Topic: Entropy
Update: 2025-11-12
Description
This episode defines entropy (S) as a measure of the disorder or the number of ways energy and matter can be arranged in a system. Entropy naturally increases when a substance changes phase from solid to liquid to gas, as temperature increases, or when a reaction produces more gas molecules. The change in standard entropy is calculated by subtracting reactant entropies from product entropies, and is key to determining spontaneity.
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