Liquid plastic is frozen in a physical change that increases its volume. What can be known about the plastic after the change?

Question

Its mass will increase.
Its density will increase.
Its mass will remain the same.
Its density will remain the same.

Answer 1

The mass of the plastic will remain the same, as there is no change in the amount of matter present. However, its density will increase because the volume has increased while the mass has remained constant.