Which most likely indicates a chemical change has occurred?

Question

a solid substance becoming larger
a solid melting and becoming a liquid
a green liquid becoming a red liquid
a liquid freezing and becoming a solid

Answer 1

The option that most likely indicates a chemical change has occurred is:

a green liquid becoming a red liquid.

This suggests a change in the chemical composition of the substance, often associated with a chemical reaction. The other options listed (a solid substance becoming larger, a solid melting, and a liquid freezing) are physical changes, as they do not involve a change in the chemical identity of the substances involved.