What You Need to Know About Entropy – AP Chem Unit 9, Topic 1

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In this video, Mr. Krug defines entropy and then shows students how to compare the entropies of different systems, based on the state of matter, temperature, and number of molecules present. Finally, he works several examples predicting the sign of ΔS of a balanced chemical equation.

00:00 What Is Entropy?
01:17 Comparing Entropy of Different Systems
07:28 Example Number 1
08:17 Predicting the Sign of ΔS – Practice