Question

Describe what happens to the particles of a liquid, in terms of movement and kinetic energy, as it is cooled to its freezing point, including whether this is a physical or chemical change.

Answer 1

As a system is cooled to its freezing point, the kinetic energy of the particles in the system will lower so the movement are much slower. Cooling means taking out heat from the system. This process is a physical change because it is only the phase of the system is changed and it is still the substance after the process.