Question

multiple-choice question
which of the following are physical changes (check all that apply)?
□ baking cookies
□ water freezing to ice
□ chopping of wood
□ a haircut

Explanation:

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

• Baking cookies involves chemical reactions (new substances), so not physical.
• Water freezing to ice is a phase change (solid to liquid), no new substance—physical.
• Chopping wood only changes size/shape, no new substance—physical.
• A haircut changes hair length/shape, no new substance—physical.

Answer:

B. water freezing to ice, C. chopping of wood, D. a haircut