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Spot the evidence that a chemical reaction happened

6th grade (Year 7 in England) · 16 questions · Common Core: NGSS.MS-PS1-2 · England: KS3 Chemistry: Chemical reactions

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  1. Question 1

    What evidence of a chemical reaction is shown here: bubbles form when an antacid tablet is dropped in water?

    • A. a gas is given off
    • B. a colour change
    • C. a solid (precipitate) forms
    • D. an energy change (heat or light)

  2. Question 2

    Bread is toasted and goes brown and crisp. What kind of change is this?

    • A. chemical, because new substances form that cannot be turned back into bread
    • B. physical, because it is only heated
    • C. physical, because it is still bread
    • D. no change at all

  3. Question 3

    Chemical reactions: which statement is NOT true?

    • A. In a chemical reaction, new substances are made.
    • B. Rusting is a chemical change.
    • C. Atoms are destroyed in chemical reactions.
    • D. Many chemical reactions are hard to reverse.

  4. Question 4

    What evidence of a chemical reaction is shown here: a shiny iron nail slowly turns orange-brown in damp air?

    • A. a gas is given off
    • B. a colour change
    • C. a solid (precipitate) forms
    • D. an energy change (heat or light)

  5. Question 5

    Which observation is the strongest evidence that burning a candle is a chemical change?

    • A. The wax melts
    • B. The candle gets shorter
    • C. The wick is white
    • D. Carbon dioxide and water vapour are made, and energy is released as heat and light

  6. Question 6

    Chemical reactions: which statement is NOT true?

    • A. Many chemical reactions are hard to reverse.
    • B. Dissolving salt in water is a physical change.
    • C. Boiling water is a chemical reaction because bubbles form.
    • D. In a chemical reaction, new substances are made.

  7. Question 7

    What evidence of a chemical reaction is shown here: a hand warmer gets hot when opened?

    • A. a gas is given off
    • B. a colour change
    • C. a solid (precipitate) forms
    • D. an energy change (heat or light)

  8. Question 8

    Bread is toasted and goes brown and crisp. What kind of change is this?

    • A. physical, because it is still bread
    • B. chemical, because new substances form that cannot be turned back into bread
    • C. physical, because it is only heated
    • D. no change at all

  9. Question 9

    Chemical reactions: which statement is NOT true?

    • A. Every colour change proves a chemical reaction.
    • B. Rusting is a chemical change.
    • C. In a chemical reaction, new substances are made.
    • D. Many chemical reactions are hard to reverse.

  10. Question 10

    What evidence of a chemical reaction is shown here: a hand warmer gets hot when opened?

    • A. a gas is given off
    • B. a colour change
    • C. a solid (precipitate) forms
    • D. an energy change (heat or light)

  11. Question 11

    Bread is toasted and goes brown and crisp. What kind of change is this?

    • A. physical, because it is only heated
    • B. physical, because it is still bread
    • C. no change at all
    • D. chemical, because new substances form that cannot be turned back into bread

  12. Question 12

    Chemical reactions: which statement is NOT true?

    • A. Rusting is a chemical change.
    • B. Dissolving salt in water is a physical change.
    • C. Many chemical reactions are hard to reverse.
    • D. Every colour change proves a chemical reaction.

  13. Question 13

    What evidence of a chemical reaction is shown here: a shiny iron nail slowly turns orange-brown in damp air?

    • A. a gas is given off
    • B. a colour change
    • C. a solid (precipitate) forms
    • D. an energy change (heat or light)

  14. Question 14

    Ice melts into water. A student says this is a chemical reaction because it changes. Why is this wrong?

    • A. Melting releases a new gas
    • B. All changes are chemical reactions
    • C. No new substance forms: it is still water, so it is a physical change
    • D. Ice and water are different elements

  15. Question 15

    Chemical reactions: which statement is NOT true?

    • A. Dissolving salt in water is a physical change.
    • B. Many chemical reactions are hard to reverse.
    • C. Atoms are destroyed in chemical reactions.
    • D. Rusting is a chemical change.

  16. Question 16

    What evidence of a chemical reaction is shown here: a cut apple turns brown?

    • A. a gas is given off
    • B. a colour change
    • C. a solid (precipitate) forms
    • D. an energy change (heat or light)

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Answer key: Spot the evidence that a chemical reaction happened

  1. 1. A. a gas is given off

  2. 2. A. chemical, because new substances form that cannot be turned back into bread

  3. 3. C. Atoms are destroyed in chemical reactions.

  4. 4. B. a colour change

  5. 5. D. Carbon dioxide and water vapour are made, and energy is released as heat and light

  6. 6. C. Boiling water is a chemical reaction because bubbles form.

  7. 7. D. an energy change (heat or light)

  8. 8. B. chemical, because new substances form that cannot be turned back into bread

  9. 9. A. Every colour change proves a chemical reaction.

  10. 10. D. an energy change (heat or light)

  11. 11. D. chemical, because new substances form that cannot be turned back into bread

  12. 12. D. Every colour change proves a chemical reaction.

  13. 13. B. a colour change

  14. 14. C. No new substance forms: it is still water, so it is a physical change

  15. 15. C. Atoms are destroyed in chemical reactions.

  16. 16. B. a colour change