Question

What is an example of a reversible physical change?
A. Change in odor.
B. Chopping
C. Phase change.
D. Rusting

Answer 1

Answer:

$\boxed {\boxed {\sf C. \ Phase \ change }}$

Explanation:

A physical change is one where only physical, not chemical,  properties change. Let's analyze each answer choice.

A. Change in odor

• A change in order is one of the signs of a chemical change.

B. Chopping

• Chopping is a physical change, because no new substances are produced. However, it's not reversible. It's impossible to put something chopped back together again permanently.

C. Phase change

• A phase change is another physical change, plus it is reversible. For example, you can freeze water into ice and melt it back to water.

D. Rusting

• Rusting is a chemical change, because new substances are created.

So, the best answer choice for a reversible physical change is C. phase change.