Final Answer:
Q.1.
A. Physical Change: A change in which the substance’s appearance or form changes, but its chemical makeup stays the same — like melting ice or tearing paper. No new stuff is made.
B. Chemical Change: A change where the substance turns into something totally new — like burning wood or rusting iron. New stuff is made, and you can’t easily get the original back.
Q.2.
1. F (False) — Physical changes don’t change what the substance is made of — just how it looks or feels.
2. T (True) — In physical changes, no new substance is created.
3. F (False) — Chemical changes are usually hard to reverse — like un-burning wood.
4. T (True) — Melting, freezing, boiling — these are all physical changes because they’re just state changes.
Q.3.
b) change in shape — This is NOT a sign of a chemical reaction. Changing shape (like cutting or bending) is usually physical. The others (temp change, color change, gas forming) often mean a chemical reaction happened.
Q.4.
Glass breaking → Physical change
Burning wood → Chemical change
Cutting meat → Physical change
Melting ice cubes → Physical change
Chopping wood → Physical change
Fireworks exploding → Chemical change
Cooking an egg → Chemical change
Boiling water → Physical change
Rusting of iron → Chemical change
Parent Tip: Review the logic above to help your child master the concept of worksheet physical and chemical changes.
