GCSE Chemistry – Cracking – Primrose Kitten

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GCSE Chemistry – Cracking

Last updated: 20/01/2021

AQA GCSE Science – Chemistry foundation Organic chemistry GCSE Chemistry – Cracking

Learning Objectives

-I can describe the reasons why we need to crack long hydrocarbon chains
-I can describe the process of cracking by steam and a catalyst

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Question 1 of 26

1. Question
What is the definition of cracking?
- Breaking larger hydrocarbons into smaller ones by heating with a catalyst
- Breaking larger alkalis into smaller ones by heating with a catalyst
- Breaking larger acids into smaller ones by heating with a catalyst
- Breaking smaller hydrocarbons into larger ones by heating with a catalyst
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Question 2 of 26

2. Question
Why are smaller hydrocarbons more useful than larger hydrocarbons?
- Larger hydrocarbons are harder to vaporise
- Smaller hydrocarbons are harder to vaporise
- Larger hydrocarbons are easier to vaporise
- Larger hydrocarbons are more expensive
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Question 3 of 26

3. Question
Why are smaller hydrocarbons more useful than larger hydrocarbons?
- Larger hydrocarbons are harder to burn
- Smaller hydrocarbons are harder to burn
- Larger hydrocarbons are easier to burn
- Larger hydrocarbons are more expensive
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Question 4 of 26

4. Question
What type of reaction is cracking?
- Thermal decomposition
- Oxidation
- Reduction
- Neutralisation
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Question 5 of 26

5. Question
What is needed to carry out cracking?
- Steam
- Transition metal
- Nitrogen gas
- Ammonia
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Question 6 of 26

6. Question
What is needed to carry out cracking?
- Catalyst
- Metal
- Alkali
- Indicator
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Question 7 of 26

7. Question
What is cracking used to break down?
- Crude oil
- Oxygen gas
- Nitrogen dioxide
- Sulfuric acid
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Question 8 of 26

8. Question
What type of compounds does cracking produce?
- Unsaturated hydrocarbons
- Acids
- Esters
- Catalysts
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Question 9 of 26

9. Question
What type of compounds does cracking produce?
- Hydrocarbons
- Acids
- Catalysts
- Explosive
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Question 10 of 26

10. Question
What type of compounds does cracking produce?
- Saturated hydrocarbons
- Acids
- Carboxylic acids
- Long chain hydrocarbons
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Question 11 of 26

11. Question
What type of compounds does cracking produce?
- Alkenes
- Carboxylic acids
- Alkalis
- Halogens
Correct

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Question 12 of 26

12. Question
What type of compounds does cracking produce?
- Alkanes
- Carboxylic acids
- Esters
- Halogens
Correct

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Question 13 of 26

13. Question
What type of compounds does cracking produce?
- Short chain hydrocarbons
- Long chain hydrocarbons
- Alkalis
- Bases
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Question 14 of 26

14. Question
What catalyst is used for catalytic cracking?
- Silica and aluminium
- No catalyst
- Tin and hydrochloric acid
- Ethanol and sulfuric acid
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Question 15 of 26

15. Question
What conditions are needed to carry out cracking?
- High temperatures
- Low temperatures
- Low pressures
- Filtration
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Question 16 of 26

16. Question
What temperature is used during cracking?
- 500 °C
- 300 °C
- 250 °C
- 50 °C
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Question 17 of 26

17. Question
Write the word equation for the cracking of decane.
- decane -> pentane + propene + ethene
- decane -> ethane + propene + ethene
- decane -> pentane + propene + propane
- decane -> hexene + butene + ethane
Correct

Incorrect
Question 18 of 26

18. Question
Write the symbol equation for the cracking of decane.
- $C_5H_{22} -> C_5H_{12} + C_3H_6 + C_2H_4$
- $C_5H_{12} -> C_8H_{16} + C_3H_6 + C_2H_4$
- $C_5H_{22} -> C_5H_{12} + C_3H_6 + C_2H_4$
- $C_5H_{22} -> C_5H_{10} + C_4H_6 + C_2H_6$
Correct

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Question 19 of 26

19. Question
Write the word equation for the cracking of decane.
- decane -> octane + ethene
- decane -> octane + propene
- decane -> nonane + ethene
- decane -> butane + ethene
Correct

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Question 20 of 26

20. Question
Write the symbol equation for the cracking of decane.
- $C_5H_{22} -> C_8H_{18} + C_2H_4$
- $C_5H_{22} -> C_8H_{18} + C_2H_6$
- $C_5H_{22} -> C_5H_{12} + C_2H_4$
- $C_5H_{22} -> C_8H_{18} + C_4H_8$
Correct

Incorrect
Question 21 of 26

21. Question
Write the word equation for the cracking of nonane.
- nonane -> hexane + propene
- nonane -> heptane + propene
- nonane -> pentane + butane
- nonane -> hexane + propane
Correct

Incorrect
Question 22 of 26

22. Question
Write the symbol equation for the cracking of nonane.
- $C_9H_{20} -> C_6H_{14} + C_3H_6$
- $C_9H_{20} -> C_5H_{10} + C_3H_6$
- $C_9H_{20} -> C_6H_{14} + C_4H_8$
- $C_9H_{20} -> C_6H_{14} + C_3H_8$
Correct

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Question 23 of 26

23. Question
Write the word equation for the cracking of hexane.
- hexane -> butane + ethene
- hexane -> butane + methane
- hexane -> propane + ethene
- hexane -> butane + ethane
Correct

Incorrect
Question 24 of 26

24. Question
Write the symbol equation for the cracking of hexane.
- $C_6H_{14} -> C_4H_{10} + C_2H_4$
- $C_6H_{14} -> C_5H_{10} + C_3H_6$
- $C_6H_{14} -> C_5H_{10} + C_2H_4$
- $C_6H_{14} -> C_4H_{10} + C_2H_6$
Correct

Incorrect
Question 25 of 26

25. Question
Write the word equation for the cracking of propane.
- propane -> ethene + methane
- propane -> ethene + pentene
- propane -> ethane + methane
- propane -> ethane + methene
Correct

Incorrect
Question 26 of 26

26. Question
Write the symbol equation for the cracking of propane.
- $C_3H_8 -> C_2H_4 + CH_4$
- $C_3H_8 -> C_2H_4$
- $C_3H_8 -> C_2H_4 + C_2H_4$
- $C_3H_8 -> C_2H_6 + CH_4$
Correct

Incorrect

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