Apentix/AP Chemistry/Unit 6: Thermodynamics/Question
AP Chemistryeasymcq1 pt

Two metal blocks at different temperatures touch inside an insulated box. Thermal equilibrium is reached when

A.both blocks reach the same temperature and no net heat flows between them
B.both blocks end up with equal amounts of heat energy
C.both blocks acquire the same specific heat
D.all molecular motion stops in both blocks

Explanation

Core Concept

Heat flows spontaneously from the hotter block to the colder one, and the flow slows as their temperatures converge. Equilibrium is defined by equality of temperature, where the two-way exchange balances and net transfer stops. Equal temperatures do not require equal internal energies, because the blocks may differ in mass and composition. Molecular motion continues at any temperature above absolute zero; only the net transfer ceases.

Correct Answer

Aboth blocks reach the same temperature and no net heat flows between them

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