Question

What is one sign that indicates a physical change​

Answer 1

B) a substance chamges color when exposed to air

Step-by-step explanation:

I took the test

Answer 2

A - matter changes but no other substance is formed.

Step-by-step explanation:

A physical change is a type of change in which the form of matter is altered but one substance is not transformed into another. Therefore a change of matter is a physical change.