Question

crayons were left out in the sun and melted. what kind of change does this demonstrate? a physical change a mass change a chemical change a reactivity change

Explanation:

A physical change alters a substance's form or appearance without changing its chemical composition. Melting crayons changes their state from solid to liquid (form/appearance) but not their chemical makeup. A chemical change would form new substances. Mass change isn't a standard change type here. Reactivity change refers to how a substance reacts chemically, which isn't relevant as no new substances are formed.

Answer:

a physical change