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6th grade chemical reactions, acids and bases

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: 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)
2
Question 2
Chemical reactions: which statement is NOT true?
- A. Many chemical reactions are hard to reverse.
- B. Boiling water is a chemical reaction because bubbles form.
- C. Dissolving salt in water is a physical change.
- D. Rusting is a chemical change.
3
Question 3
Which observation is the strongest evidence that burning a candle is a chemical change?
- A. The wick is white
- B. Carbon dioxide and water vapour are made, and energy is released as heat and light
- C. The wax melts
- D. The candle gets shorter
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
Chemical reactions: which statement is NOT true?
- A. In a chemical reaction, new substances are made.
- B. Dissolving salt in water is a physical change.
- C. Many chemical reactions are hard to reverse.
- D. Boiling water is a chemical reaction because bubbles form.
6
Question 6
Which observation is the strongest evidence that burning a candle is a chemical change?
- A. The candle gets shorter
- B. The wick is white
- C. The wax melts
- D. Carbon dioxide and water vapour are made, and energy is released as heat and light
7
Question 7
What evidence of a chemical reaction is shown here: limewater turns cloudy?
- 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
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. Boiling water is a chemical reaction because bubbles form.
9
Question 9
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. Ice and water are different elements
- C. All changes are chemical reactions
- D. No new substance forms: it is still water, so it is a physical change
10
Question 10
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)
11
Question 11
Chemical reactions: which statement is NOT true?
- A. Every colour change proves a chemical reaction.
- B. Rusting is a chemical change.
- C. Many chemical reactions are hard to reverse.
- D. Dissolving salt in water is a physical change.
12
Question 12
Sugar dissolves in tea and seems to disappear. What kind of change is this?
- A. chemical, because the tea gets sweeter
- B. physical, because the sugar is still there and could be recovered
- C. chemical, because the sugar is destroyed
- D. the sugar turns into water
13
Question 13
What evidence of a chemical reaction is shown here: limewater turns cloudy?
- 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
Chemical reactions: which statement is NOT true?
- A. Boiling water is a chemical reaction because bubbles form.
- B. Rusting is a chemical change.
- C. Many chemical reactions are hard to reverse.
- D. Dissolving salt in water is a physical change.
15
Question 15
Sugar dissolves in tea and seems to disappear. What kind of change is this?
- A. the sugar turns into water
- B. physical, because the sugar is still there and could be recovered
- C. chemical, because the sugar is destroyed
- D. chemical, because the tea gets sweeter
16
Question 16
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)

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Answer key: 6th grade chemical reactions, acids and bases

1. D. an energy change (heat or light)
2. B. Boiling water is a chemical reaction because bubbles form.
3. B. Carbon dioxide and water vapour are made, and energy is released as heat and light
4. B. a colour change
5. D. Boiling water is a chemical reaction because bubbles form.
6. D. Carbon dioxide and water vapour are made, and energy is released as heat and light
7. C. a solid (precipitate) forms
8. D. Boiling water is a chemical reaction because bubbles form.
9. D. No new substance forms: it is still water, so it is a physical change
10. B. a colour change
11. A. Every colour change proves a chemical reaction.
12. B. physical, because the sugar is still there and could be recovered
13. C. a solid (precipitate) forms
14. A. Boiling water is a chemical reaction because bubbles form.
15. B. physical, because the sugar is still there and could be recovered
16. B. a colour change