Question

which of these is an example of a chemical change? a leaf turning green in the fall crumpling a piece of paper an ice cube melting filling a balloon with air

Explanation:

A chemical change results in a new substance with different chemical properties. A leaf turning green involves chlorophyll - related chemical reactions. Crumpling paper, melting ice, and filling a balloon with air are physical changes as they don't create new substances.

Answer:

A. A leaf turning green in the fall