Which situation shows heat transfer?, A stationary book on a table, Ice melting in a warm room, A rock lying on the ground, A closed container with no temperature change, Which of the following best describes internal energy?, Energy from the sun, The temperature of the surroundings, Energy used to do work only, The total energy of all the particles in a system, When heat is added to a system, what usually happens to its internal energy?, It decreases, It increases, It stays the same, It disappears, If heat is removed from a system, what happens to its internal energy?, It decreases, It increases, It remains constant, It doubles, What happens to particles in a substance when heat is added?, They slow down, They stop moving, They move faster, They disappear

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