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AP Chemistry Unit 6.3: Thermal Energy Transfer

Practice AP Chemistry Unit 6.3 questions on representing thermal-energy transfer with particle motion and changes in molecular speed as systems approach equilibrium.

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Use molecular geometry and intermolecular forces to explain polarity, solubility, phase behavior, and properties.
  • Interpret structural and particle evidence to connect bonding models with observed chemical behavior.

Covered syllabus points

6.3.A—Explain the relationship between the transfer of thermal energy and molecular collisions

6.3 Heat Transfer and Thermal Equilibrium question 1

[Maximum number: 1]

A student performs an experiment to determine the specific heat capacity of a metal. The student places a cube of the metal in boiling water so its temperature will be 100.0°C. The student then places the metal cube into a calorimeter that contains water and records the highest temperature of the water. A data table and a diagram of the thermometer at the highest temperature are shown.

Figure for Question 6.3 Heat Transfer and Thermal Equilibrium question 1 — AP Chemistry

A particle-level representation of water molecules in the calorimeter before and after the metal cube was added is shown. The length of the arrows in the Before diagram represents the speed of the water molecules in the system. In the After diagram, draw an arrow for each molecule to indicate how the speed of each of the molecules changes after the metal cube is added.

Figure for Question 6.3 Heat Transfer and Thermal Equilibrium question 1 — AP Chemistry
Figure for Question 6.3 Heat Transfer and Thermal Equilibrium question 1 — AP Chemistry
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