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CognitoAlkanes and crude oil
CognitoCracking of alkanes
Key facts & methods
Alkane homologous series — fill in the table
| Term | Detail |
|---|
| General formula | |
| Methane / Ethane | |
| Propane / Butane | |
| Bonding | |
| Boiling point trend | |
| Longer chains | |
Fractional distillation of crude oil — fill in the table
| Term | Detail |
|---|
| Crude oil | |
| Distillation process | |
| Top of column (short chains) | |
| Bottom of column (long chains) | |
Combustion of alkanes — fill in the table
| Term | Detail |
|---|
| Complete combustion (excess O2) | |
| Incomplete combustion (limited O2) | |
| Carbon monoxide | |
| Combustion products | |
Cracking — fill in the table
| Term | Detail |
|---|
| Why crack | |
| Cracking | |
| Products | |
| Catalytic cracking | |
| Steam cracking | |
Exam questions — 4 questions · 10 marks · AQA 8462 style
⚡ Show all working — the AI marks against the AQA mark scheme. Method marks awarded for correct working even if the final answer is wrong.
1 markAlkane formulaAQA 8462
What is the molecular formula of propane?
A C3H6
B C3H8
C C3H4
D C4H10
2 marksCombustion equationAQA 8462
Write a balanced symbol equation for the complete combustion of methane (CH4). (2 marks)
+20 XP
1 markCracking purposeAQA 8462
What is the main purpose of cracking long-chain alkanes?
A Convert alkanes into alcohols
B Break them into shorter, more useful molecules including fuels and alkenes for polymers
C Remove sulfur from crude oil
D Increase boiling point of oil fractions
3 marksFractionating columnAQA 8462
Explain how the fractionating column separates crude oil. Why are shorter-chain hydrocarbons more useful as fuels? (3 marks)
+30 XP
Quick recall flashcards
Module complete! 🎉
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