Question

a _____ is a change in the form or state of a substance. chemical change physical change reaction

Explanation:

A physical change is a change in the form or state of a substance. For example, melting ice (solid - liquid) or boiling water (liquid - gas) are physical changes. In a physical change, the chemical composition of the substance remains the same. A chemical change (or reaction) involves a change in the chemical composition of the substance, forming new substances.

Answer:

B. physical change