Question

liquid plastic is frozen in a physical change that increases its volume. what can be known about the plastic after the change?
its mass will increase.
its density will increase.
its mass will remain the same.
its density will remain the same.

Explanation:

A physical change does not alter the amount of matter (mass) in a substance. Density is calculated as $\frac{\text{mass}}{\text{volume}}$. Since mass stays constant and volume increases, density will decrease. Only the option about mass remaining the same is correct.

Answer:

Its mass will remain the same.