AP Chemistry Flashcards: Heat Transfer and Thermal Equilibrium
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
What is the role of collisions in the process of heat exchange?
Collisions between particles are the mechanism through which the transfer of energy occurs during heat exchange.
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What is the role of collisions in the process of heat exchange?
Collisions between particles are the mechanism through which the transfer of energy occurs during heat exchange.
Explain the relationship between thermal energy transfer, molecular collisions, and thermal equilibrium.
Thermal energy is transferred via molecular collisions until the particles of the bodies in contact have the same average kinetic energy, a state known as thermal equilibrium.
When two objects at different temperatures are in thermal contact, what happens to their particles' average kinetic energy over time?
Through collisions, energy is transferred until the particles of both objects have the same average kinetic energy, reaching thermal equilibrium.
Define thermal equilibrium.
Thermal equilibrium is the state reached when continuous particle collisions result in both bodies having the same average kinetic energy and temperature.
What condition is met regarding average kinetic energy when thermal equilibrium is reached?
At thermal equilibrium, the particles of the bodies in contact have the same average kinetic energy.
What is the fundamental mechanism behind the transfer of thermal energy?
The transfer of thermal energy is caused by molecular collisions between particles.
What is 'heat transfer'?
Heat transfer is the process of energy transfer that results from collisions between particles of bodies in thermal contact.
How does the average kinetic energy of particles differ between a warmer body and a cooler body?
The particles in a warmer body have a greater average kinetic energy than the particles in a cooler body.
If a warm object is placed in contact with a cool object, what is the eventual outcome for their temperatures?
The objects will eventually reach thermal equilibrium, resulting in the same temperature for both bodies.
What is another term for 'heat transfer'?
Another term for 'heat transfer' is 'heat exchange'.