A aluminum block at is placed in thermal contact with of water at inside an adiabatic

CHEMISTRY · Single correct · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

1\,\text{kg}

aluminum block at

500\;\text{K}

is placed in thermal contact with

2\,\text{kg}

of water at

300\;\text{K}

inside an adiabatic, rigid container. After a long time the block and the water reach a common equilibrium temperature. Consider the following two choices of system boundaries. I. The aluminum block alone. II. The aluminum block together with the water (everything inside the container). Which of the following best describes the entropy change of each system after thermal equilibrium is reached? (a)

I\text{ increases; }II\text{ increases}

(b)

I\text{ decreases; }II\text{ remains unchanged}

(c)

I\text{ decreases; }II\text{ increases}

(d)

I\text{ remains unchanged; }II\text{ increases}

Related theory

Thermodynamics
Entropy and second law
Spontaneity and Entropy

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