Question

1. classify each change as physical or chemical. a. crushing an aluminum can b. recycling used aluminum cans to make new ones c. aluminum combining with oxygen to form aluminum oxide

Explanation:

• a. Crushing an aluminum can only changes its shape, not its chemical composition, so it's a physical change.
• b. Recycling used aluminum cans to make new ones involves melting and reforming the metal. No new substances are formed chemically, so it's a physical change.
• c. Aluminum combining with oxygen to form aluminum oxide is a chemical reaction as a new substance (aluminum oxide) is formed.

Answer:

a. Physical change
b. Physical change
c. Chemical change