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Combustion, oxidation and the fire triangle

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

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Date

Score/ 16

1
Question 1
Firefighters cut a firebreak (a strip with no trees) in front of a wildfire. Which side of the fire triangle does this remove?
- A. oxygen
- B. water
- C. heat
- D. fuel
Question 2
Complete the word equation: magnesium + oxygen → ?
Answer
3
Question 3
Combustion: which statement is NOT true?
- A. Combustion is a reaction with oxygen that releases energy.
- B. Combustion is an endothermic reaction.
- C. Burning fossil fuels releases carbon dioxide.
- D. Rusting is a slow oxidation reaction.
4
Question 4
A fire blanket is thrown over a burning pan. Which side of the fire triangle does it remove?
- A. none
- B. oxygen
- C. fuel
- D. heat
Question 5
Complete the word equation: zinc + oxygen → ?
Answer
6
Question 6
Combustion: which statement is NOT true?
- A. Rusting is a slow oxidation reaction.
- B. Combustion is an endothermic reaction.
- C. Combustion is a reaction with oxygen that releases energy.
- D. Burning fossil fuels releases carbon dioxide.
7
Question 7
Why is a gas boiler with a poor air supply dangerous?
- A. It produces too much oxygen
- B. It makes the water too pure
- C. Incomplete combustion produces toxic carbon monoxide
- D. It stops producing heat completely
Question 8
Complete the word equation: magnesium + oxygen → ?
Answer
9
Question 9
Combustion: which statement is NOT true?
- A. Hydrogen burns to make only water.
- B. Combustion is an endothermic reaction.
- C. Burning fossil fuels releases carbon dioxide.
- D. Rusting is a slow oxidation reaction.
10
Question 10
What are the products when methane (natural gas) burns completely?
- A. carbon monoxide and soot
- B. carbon dioxide and water
- C. methane and oxygen
- D. oxygen and hydrogen
Question 11
Complete the word equation: calcium + oxygen → ?
Answer
12
Question 12
Combustion: which statement is NOT true?
- A. Rusting is a slow oxidation reaction.
- B. Combustion is a reaction with oxygen that releases energy.
- C. Burning fossil fuels releases carbon dioxide.
- D. Water is the best way to put out an oil fire in a pan.
13
Question 13
Why is a gas boiler with a poor air supply dangerous?
- A. It stops producing heat completely
- B. Incomplete combustion produces toxic carbon monoxide
- C. It produces too much oxygen
- D. It makes the water too pure
Question 14
Complete the word equation: calcium + oxygen → ?
Answer
15
Question 15
Combustion: which statement is NOT true?
- A. A fire can burn without oxygen.
- B. Hydrogen burns to make only water.
- C. Rusting is a slow oxidation reaction.
- D. Combustion is a reaction with oxygen that releases energy.
16
Question 16
What are the products when methane (natural gas) burns completely?
- A. carbon monoxide and soot
- B. methane and oxygen
- C. carbon dioxide and water
- D. oxygen and hydrogen

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Answer key: Combustion, oxidation and the fire triangle

1. D. fuel
2. magnesium oxide
3. B. Combustion is an endothermic reaction.
4. B. oxygen
5. zinc oxide
6. B. Combustion is an endothermic reaction.
7. C. Incomplete combustion produces toxic carbon monoxide
8. magnesium oxide
9. B. Combustion is an endothermic reaction.
10. B. carbon dioxide and water
11. calcium oxide
12. D. Water is the best way to put out an oil fire in a pan.
13. B. Incomplete combustion produces toxic carbon monoxide
14. calcium oxide
15. A. A fire can burn without oxygen.
16. C. carbon dioxide and water