Physical and chemical changes Quiz
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5 questions, one answer each
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1. Which is a chemical change?
- A. Ice melting
- B. Salt dissolving in water
- C. Iron rusting
- D. Water boiling
2. Which is NOT a sign of a chemical change?
- A. A gas is produced
- B. A colour change
- C. A new substance forms
- D. The substance changes from solid to liquid
3. What is a precipitate?
- A. A gas given off in a reaction
- B. An insoluble solid formed when solutions react
- C. A liquid that boils
- D. A substance that dissolves
4. Why can dissolving not be a chemical change?
- A. It is too slow
- B. The sugar is hot
- C. It always cools the mixture
- D. No new substance is made
5. Which statement about reversibility is correct?
- A. Most chemical changes are easy to reverse
- B. Most physical changes are easy to reverse
- C. No chemical change can be reversed
- D. Physical changes make new substances