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:

Step1: Recall the concept of mass in physical changes

Mass is conserved in physical changes. Freezing is a physical change. So, the mass of the plastic does not change.

Step2: Analyze density formula

Density formula is \(
ho=\frac{m}{V}\). Given \(V\) (volume) increases and \(m\) (mass) remains the same.
Using the formula \(
ho=\frac{m}{V}\), when \(m\) is constant and \(V\) increases, \(
ho\) (density) decreases.

Answer:

Its mass will remain the same.