Question

check all examples that are physical changes.
water freezing to make ice
bicycle chain rusted
paper cut to make a snowflake
peanuts turned into peanut butter

Explanation:

To determine physical changes, we identify processes where no new substance is formed.

• Water freezing to make ice: This is a phase change (liquid to solid) of water, and the substance remains H₂O. No new substance is formed, so it's a physical change.
• Bicycle chain rusted: Rusting involves iron reacting with oxygen to form iron oxide (a new substance), so it's a chemical change.
• Paper cut to make a snowflake: Cutting paper only changes its shape; the paper remains paper (no new substance), so it's a physical change.
• Peanuts turned into peanut butter: Grinding peanuts into peanut butter changes the form but not the chemical identity of the peanuts (assuming no chemical reactions like cooking, just mechanical grinding), so it's a physical change.

Answer:

• water freezing to make ice
• paper cut to make a snowflake
• peanuts turned into peanut butter