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Reactants, products and word equations

7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-PS1-2, NGSS.MS-PS1-5 · England: KS3 Chemistry: Chemical reactions

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Score/ 16

1
Question 1
Word equations: which statement is NOT true?
- A. Products are the substances you start with.
- B. Combustion is a reaction with oxygen.
- C. Reactants are written on the left of the arrow.
- D. Incomplete combustion can produce carbon monoxide, a poisonous gas.
2
Question 2
Calcium carbonate is heated strongly: calcium carbonate → calcium oxide + ___
- A. oxygen
- B. water
- C. carbon dioxide
- D. hydrogen
3
Question 3
Complete the word equation: iron + oxygen → ___
- A. iron chloride
- B. iron carbonate
- C. copper oxide
- D. iron oxide
4
Question 4
Word equations: which statement is NOT true?
- A. Combustion is a reaction with oxygen.
- B. Burning metal makes it lighter because mass is lost.
- C. Incomplete combustion can produce carbon monoxide, a poisonous gas.
- D. Thermal decomposition breaks a substance down using heat.
5
Question 5
Why does a candle under a glass jar go out?
- A. The wax turns into water
- B. Glass puts out flames
- C. The oxygen inside is used up
- D. The jar gets too heavy
6
Question 6
Complete the word equation: copper + oxygen → ___
- A. carbon dioxide
- B. zinc oxide
- C. copper oxide
- D. copper carbonate
7
Question 7
Word equations: which statement is NOT true?
- A. Thermal decomposition breaks a substance down using heat.
- B. Combustion is a reaction with oxygen.
- C. Burning metal makes it lighter because mass is lost.
- D. Reactants are written on the left of the arrow.
8
Question 8
In the reaction "iron + sulfur → iron sulfide", what are the reactants?
- A. iron and sulfur
- B. iron sulfide
- C. iron only
- D. sulfur and iron sulfide
9
Question 9
Complete the word equation: magnesium + oxygen → ___
- A. magnesium carbonate
- B. magnesium chloride
- C. carbon dioxide
- D. magnesium oxide
10
Question 10
Word equations: which statement is NOT true?
- A. Incomplete combustion can produce carbon monoxide, a poisonous gas.
- B. Reactants are written on the left of the arrow.
- C. The arrow in a word equation means "equals".
- D. Combustion is a reaction with oxygen.
11
Question 11
Methane burns completely in air: methane + oxygen → carbon dioxide + ___
- A. hydrogen
- B. nitrogen
- C. water
- D. carbon monoxide
12
Question 12
Complete the word equation: copper + oxygen → ___
- A. copper carbonate
- B. copper chloride
- C. copper oxide
- D. carbon dioxide
13
Question 13
Word equations: which statement is NOT true?
- A. Reactants are written on the left of the arrow.
- B. Combustion is a reaction with oxygen.
- C. Products are the substances you start with.
- D. Incomplete combustion can produce carbon monoxide, a poisonous gas.
14
Question 14
What is needed for fuels to burn?
- A. nitrogen only
- B. carbon dioxide
- C. oxygen and enough heat
- D. water and light
15
Question 15
Complete the word equation: copper + oxygen → ___
- A. iron oxide
- B. copper oxide
- C. copper carbonate
- D. copper chloride
16
Question 16
Word equations: which statement is NOT true?
- A. Reactants are written on the left of the arrow.
- B. Incomplete combustion can produce carbon monoxide, a poisonous gas.
- C. Combustion is a reaction with oxygen.
- D. Products are the substances you start with.

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Answer key: Reactants, products and word equations

1. A. Products are the substances you start with.
2. C. carbon dioxide
3. D. iron oxide
4. B. Burning metal makes it lighter because mass is lost.
5. C. The oxygen inside is used up
6. C. copper oxide
7. C. Burning metal makes it lighter because mass is lost.
8. A. iron and sulfur
9. D. magnesium oxide
10. C. The arrow in a word equation means "equals".
11. C. water
12. C. copper oxide
13. C. Products are the substances you start with.
14. C. oxygen and enough heat
15. B. copper oxide
16. D. Products are the substances you start with.