Question

which of these are examples of physical changes?
options: burning paper, breaking an egg, spoiled milk, freezing a popsicle, silver tarnishing

Explanation:

To determine which are physical changes, we recall: a physical change doesn't form new substances, just changes state/appearance.

• Burning paper: Chemical (new substances, combustion).
• Breaking an egg: Chemical (protein denaturation, new structure).
• Spoiled milk: Chemical (bacterial action, new substances).
• Freezing a popsicle: Physical (liquid to solid, no new substance).
• Silver tarnishing: Chemical (reaction with sulfur, new compound).

Answer:

Freezing a popsicle