You are presented with the question "What do phase changes not change?" and the following answer choices: 
- Time and energy
 - properties of object
 - Heat energy
 - color of object
 - population movement
 - shape of object
 - amount of matter
 - Molecular kinetic energy

Now knowing that phase changes do not change mass and mass Amount of matter an object contains, choose the best answer.


 

       amount of matter  