Question

A student chemist created the following model to explain a phase change they observed at home: A chocolate bar was placed in a hot pan. The chocolate began to flow, and it took the shape of the pan. Explain the changes you would make to the model in order to correctly show what changed the chocolate molecules’ freedom of movement.

Answer 1

Since the energy involved in a phase changes is used to break bonds, there is no increase in the kinetic energies of the particles, and therefore no rise in temperature.

Step-by-step explanation:

Answer 2

Since the energy involved in a phase changes is used to break bonds, there is no increase in the kinetic energies of the particles, and therefore no rise in temperature.