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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

    Sugar dissolves in tea and seems to disappear. What kind of change is this?

    • A. physical, because the sugar is still there and could be recovered
    • B. chemical, because the tea gets sweeter
    • C. the sugar turns into water
    • D. chemical, because the sugar is destroyed

  2. Question 2

    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)

  3. Question 3

    Chemical reactions: which statement is NOT true?

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

  4. Question 4

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

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

  5. Question 5

    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)

  6. Question 6

    Chemical reactions: which statement is NOT true?

    • A. Dissolving salt in water is a physical change.
    • B. Rusting is a chemical change.
    • C. In a chemical reaction, new substances are made.
    • D. Every colour change proves a chemical reaction.

  7. Question 7

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

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

  8. Question 8

    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)

  9. Question 9

    Chemical reactions: which statement is NOT true?

    • A. Dissolving salt in water is a physical change.
    • B. In a chemical reaction, new substances are made.
    • C. Rusting is a chemical change.
    • D. Every colour change proves a chemical reaction.

  10. Question 10

    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. no change at all
    • D. physical, because it is only heated

  11. Question 11

    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)

  12. Question 12

    Chemical reactions: which statement is NOT true?

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

  13. Question 13

    Sugar dissolves in tea and seems to disappear. What kind of change is this?

    • A. chemical, because the sugar is destroyed
    • B. chemical, because the tea gets sweeter
    • C. physical, because the sugar is still there and could be recovered
    • D. the sugar turns into water

  14. Question 14

    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)

  15. Question 15

    Chemical reactions: which statement is NOT true?

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

  16. Question 16

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

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

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  1. physical, because the sugar is still there and could be recovered
  2. a gas is given off
  3. Boiling water is a chemical reaction because bubbles form.
  4. No new substance forms: it is still water, so it is a physical change
  5. a colour change
  6. Every colour change proves a chemical reaction.
  7. No new substance forms: it is still water, so it is a physical change
  8. a colour change
  9. Every colour change proves a chemical reaction.
  10. chemical, because new substances form that cannot be turned back into bread
  11. a colour change
  12. Boiling water is a chemical reaction because bubbles form.
  13. physical, because the sugar is still there and could be recovered
  14. a colour change
  15. Boiling water is a chemical reaction because bubbles form.
  16. No new substance forms: it is still water, so it is a physical change