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Heat Transfer and Thermal Equilibrium

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When objects at different temperatures touch, heat flows from the warmer body to the cooler one until they reach thermal equilibrium — the same temperature. Temperature reflects average kinetic energy; heat is the energy transferred. Reaching equilibrium means equal temperature, not equal heat content.

UNIT 6 TOPIC 6.3 • HEAT TRANSFER AND THERMAL EQUILIBRIUM HEAT TRANSFER BEFORE CONTACT warmer body higher average KE CONTACT heat energy transfers by collisions from higher T → lower T AT EQUILIBRIUM same temperature same average kinetic energy CED ANCHOR Heat flows spontaneously from HIGHER to LOWER temperature via particle collisions — never because a substance is “cold.” Energy transfers until the two objects reach equal average kinetic energy. TAKEAWAY At equilibrium T and average KE are equal — but total thermal energy need not be equal. AP Chemistry · Unit 6 · Thermodynamics
Heat flows from the warmer body (higher average kinetic energy) to the cooler one until they reach thermal equilibrium at the same temperature. Equilibrium means equal temperature, not equal heat content, and heat and temperature are distinct quantities.
Thermal Mixer · Open the sandbox →

The traps confuse heat with temperature, or picture thermal equilibrium as equal energy content rather than equal temperature. Heat is the energy in transit; temperature is what equalizes.

The work

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Lesson
Heat Transfer ›

Heat flows from warm to cool until thermal equilibrium — equal temperature, not equal heat. The lesson separates heat from temperature, then closes with a ten-scenario check.

Skill check · 10 scenarios
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Diagnostic
10-item topic check ›

Ten items spanning the Topic 6.3 misconceptions: a broken model of thermal equilibrium, heat equated with temperature, and temperature change reasoned without mass and specific heat.

Not started · 10 items · ~15 min
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Targeted Practice
Drill a single misconception ›

Pick one of the failure modes you missed and drill it on its own. The round is adaptive: two correct in a row clears the misconception and moves you to the next.

Take the diagnostic to identify your misconceptions
Diagnostic first