Question 1Multiple choice · 1 markA* challenge
Which changes are chemical changes?
1 condensing steam
2 cooking an egg
3 burning magnesium
- A 1, 2 and 3
- B 2 and 3 only
- C 2 only
- D 3 only
Show answer
Answer: B
Free Physical & chemical changes questions for IGCSE Chemistry (0620), part of Chemical reactions. Each question has the answer and the marking points an examiner would look for.
Generate a full Physical & Chemical Changes worksheet →All Chemical reactions questionsWhich changes are chemical changes?
1 condensing steam
2 cooking an egg
3 burning magnesium
Answer: B
Which term is described by this statement?
“A change in which no new substance is formed, such as a change of state.”
Answer: D
Which changes are chemical changes?
1 burning magnesium
2 rusting of iron
3 melting ice
Answer: B
When a candle burns, both physical and chemical changes take place.
Identify one physical change and one chemical change.
Give two signs that a chemical change has occurred.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | wax melts; wax burns physical: wax melts (or wax vapour condenses) B1 chemical: wax burns forming CO₂ and water B1 | 2 |
| (b) | new substance; energy change; colour change; gas Any 2 of: a new substance forms; energy change (heat/light); colour change; gas produced B2 | 2 |
Some changes are physical and some are chemical.
State two differences between a physical change and a chemical change.
Classify each change as physical or chemical: melting ice; burning wood; dissolving sugar; rusting iron.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | new substance; reversibility Any 2 of: a chemical change forms a new substance, a physical change does not; physical changes are usually easily reversed; chemical changes usually involve an energy change B2 | 2 |
| (b) | P, C, P, C melting ice and dissolving sugar are physical B1 burning wood and rusting iron are chemical (all four = 2, two or three = 1) B1 | 2 |
Dissolving salt in water and electrolysing salt solution are different changes.
Explain which is a physical change and which is a chemical change.
| Part | Answer and marking points | Marks |
|---|---|---|
| dissolving physical; electrolysis chemical dissolving is physical as the salt can be recovered by evaporation B1 electrolysis is chemical as new substances (chlorine, hydrogen) form B1 | 2 |
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