Question

what is an example of a physical change? having less ash than the paper that was burned to form it ice forming and then melting back into water rust having a different identity than the iron it forms on the irreversible reaction of vinegar and baking soda

Explanation:

A physical change is a change in which the substance's physical form changes, but its chemical composition remains the same. Ice forming and melting back to water is a phase - change (solid to liquid and vice - versa) without altering the chemical identity of water (H₂O). Burning paper is a chemical change as new substances are formed. Rusting of iron is a chemical reaction forming iron oxide. The reaction between vinegar and baking soda is a chemical reaction producing carbon dioxide and other products.

Answer:

ice forming and then melting back into water