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AP Physics 2/Unit 9 – Thermodynamics
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Entropy and Irreversible Processes

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Equal masses of water, initially at 20°C and 80°C, are mixed within an insulated container. Which of the following best explains why this process is considered irreversible?

A

Total energy is not conserved in the mixing process

B

The specific heat capacity of water decreases

C

The energy becomes more dispersed with higher entropy

D

Water molecules are permanently changed by heating

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