Fact 1: Phase changes do not change mass.

Fact 2: Mass Amount of matter an object contains.

Given the two facts above, answer the question "What do phase changes not change?" with the following options: 
- Time and energy
 - properties of object
 - Heat energy
 - color of object
 - population movement
 - shape of object
 - amount of matter
 - Molecular kinetic energy


 

       amount of matter  