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AP® Chemistry · Unit 6 · Topic 6.3

Heat Transfer and Thermal Equilibrium: Topic Checklist (Chemistry 6.3)

Specific “I can…” statements for heat transfer and thermal equilibrium, each linked to the guide section and practice question that shows whether you can really do it.

Work through the list without notes. If you cannot do a statement, follow its link, then come back. Guide = study guide; Practice = practice questions.

Understanding

  • I can explain that the particles of a warmer body have a greater average kinetic energy than those of a cooler body, and that the two spreads of energy overlap. (Guide: “What temperature means for particles”; Practice Q1)
  • I can explain the difference between heat (energy in transit) and temperature (a measure of average kinetic energy). (Guide: “How collisions move energy”)
  • I can describe thermal equilibrium as equal average kinetic energy and equal temperature, with collisions continuing but no net transfer. (Guide: “Reaching thermal equilibrium”; Practice Q2)
  • I can explain why particles at the same temperature have the same average kinetic energy but not the same average speed. (Guide: “Same temperature, different particles”; Practice Q3)

Skills

  • I can compare average kinetic energies at two temperatures by converting to kelvin first. (Guide: Worked example 2; Practice Q4, Q7(a))
  • I can use temperature–time data to state the direction of heat transfer. (Guide: Worked example 3; Practice Q5(a))
  • I can decide from data, using the precision of the thermometer, when thermal equilibrium is reached. (Guide: Worked example 3; Practice Q5(d))
  • I can sketch temperature–time curves for two bodies approaching thermal equilibrium. (Guide: Figure 2; Practice Q7(c))

Reasoning

  • I can explain, naming the particles, how collisions move energy from a warmer body to a cooler one, including through a wall between them. (Guide: Worked example 1; Practice Q5(b), Q7(b))
  • I can explain why the net transfer slows as the temperatures get closer. (Practice Q5(c))
  • I can evaluate a claim that confuses total energy with temperature, or says particles stop at equilibrium. (Practice Q6)
  • I can explain why the final temperature lies between the two starting temperatures in an insulated system. (Guide: “Energy is conserved during heat transfer”)

All ticked? Move on to Topic 6.4, Heat Capacity and Calorimetry, or return to the course roadmap.

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