Question

is not necessarily the result of a chemical reaction. a hard - boiled egg a fire steam a rusted shovel

Explanation:

• A hard - boiled egg: Denaturation of proteins (a chemical change).
• A fire: Combustion (a chemical reaction).
• Steam: Physical change (water changing from liquid to gas, no new substance formed in terms of chemical composition).
• A rusted shovel: Oxidation (a chemical reaction).

Answer:

C. Steam