Question

identify an example of a chemical change.
cutting a steak
condensing vapor
cooking an egg
boiling water

Explanation:

• Cutting a steak: Physical change as it only changes the shape, no new substance formed.
• Condensing vapor: Physical change (phase change from gas to liquid), no new chemical substance.
• Cooking an egg: Chemical change. Proteins in the egg undergo denaturation (a chemical reaction) due to heat, forming new substances with different properties.
• Boiling water: Physical change (phase change from liquid to gas), no new chemical entity.

Answer:

C. Cooking an egg