Question

which is a physical change? rusting iron burning paper folding paper baking brownies

Explanation:

A physical change is a change in which the substance's chemical composition remains the same. Rusting iron is a chemical reaction between iron and oxygen forming iron - oxide. Burning paper and baking brownies involve chemical reactions that change the substances' chemical makeup. Folding paper only changes its physical shape and form, not its chemical composition.

Answer:

Folding paper