Question

1. which of the following is a chemical change? (1pts) water evaporates a penny tarnishes ice melts rock is ground into sand

Explanation:

A chemical change forms a new substance, while physical changes only alter state/shape without new matter. Water evaporating, ice melting, and rock grinding to sand are physical changes (no new substance forms). A penny tarnishing involves copper reacting with oxygen/sulfur to form new compounds (tarnish), which is a chemical change.

Answer:

□ a penny tarnishes