Question

1. Underline the correct words to complete the sentences: When a glass of milk cools down, its constituent particles (speeds up/slows down). This means that the kinetic energy of each particle (increases/decreases), such that the total kinetic energy of the milk (increases/decreases). When the milk freezes, the constituent particles become (closer together/farther apart), so the strength of the intermolecular forces (increases/ decreases) and the total potential energy (increases/decreases). Hence, the internal energy of the milk (increases/decreases).

Answer 1

When a glass of milk cools down , it's constituent particles slows down . This means that the kinetic energy of each particle decreases . When the milk freezes , the constituent particles become closer together , so the strength of the intermolecular forces decreases and the total potential energy decreases . Hence the internal energy of the milk decreases .