Question

Fifteen grams of a liquid plastic are frozen in a physical change that increases the volume. What can be known about the plastic after the change?

It will weigh more than 15 grams.
It will have an increased density.
It will still weigh 15 grams.
It will still have the same density.

Answer 1

I believe the correct answer from the choices listed above would be the third option. Fifteen grams of a liquid plastic are frozen in a physical change that increases the volume. After this change, we can still say that it will still weigh 15 grams. This is on the basis of the law of conservation of mass where mass cannot be destroyed nor created.

Answer 2

Answer: Option (c) is the correct answer.

Explanation:

According to law of conservation of mass, mass can neither be created nor it can be destroyed but it can be transformed from one form to another.

Therefore, when liquid plastic is frozen then then its molecules become closer to each other as a result, it changes into solid state.

But it will still weigh the same as there will be no effect on its mass.

Thus, we can conclude that plastic after the change will still weigh 15 grams.