Question

1. which of the following is a physical change? (3pts)

□ kerosene burning
□ decomposition of water by electrolysis
□ salt dissolving in water
□ converting alcohol to vinegar

Explanation:

A physical change does not form new substances, only alters the state or appearance of matter. Kerosene burning, water electrolysis, and alcohol-to-vinegar conversion all produce new substances (chemical changes). Salt dissolving in water only disperses salt ions, with no new substance formed.

Answer:

salt dissolving in water