Question

matter review
identify the following as either physical changes or chemical changes, and sort them into the correct category.
dissolving burning melting rusting breaking boiling
cooking
physical changes chemical changes
slide 9 of 14 previous next
show text version

Explanation:

To determine physical and chemical changes, we use the definitions:

• Physical Changes: No new substance is formed (only state/shape changes).
• Dissolving: E.g., salt in water (no new substance, just mixing).
• Melting: Solid → liquid (state change, same substance).
• Breaking: Change in shape/size (no new substance).
• Boiling: Liquid → gas (state change, same substance).

• Chemical Changes: New substance is formed (involves reactions).
• Burning: Combustion (new substances like CO₂).
• Rusting: Iron + O₂ + H₂O → rust (new substance).
• Cooking: Chemical reactions (e.g., protein denaturation, starch gelatinization).

Answer:

Physical Changes:

Dissolving, Melting, Breaking, Boiling

Chemical Changes:

Burning, Rusting, Cooking