Question

Which of the following is a definite indicator of a chemical change?

A.
A substance is converted from a liquid to a gas.
B.
The change in a substance is reversible.
C.
The shape of a substance is changed.
D.
A new substance is formed.

Answer 1

D. a new substance is formed. if it is chemical change then it is actually changing to something new. In this case a new substance is formed. It is a completely different substance from what you started out with.