C9 - Crude oil and fuels Flashcards
1
Q
How is crude oil separated?
A
Separated into fractions in industry using fractional distillation
2
Q
Hydrocarbons with the smallest molecules…?
A
Have the lowest boiling points
3
Q
What is it called when pure hydrocarbons are burnt completely?
A
Oxidisation to carbon dioxide and water
4
Q
Hydrocarbons with the smallest molecules…?
A
Have the lowest boiling points
5
Q
What is it called when pure hydrocarbons are burnt completely?
A
Oxidisation to carbon dioxide and water
6
Q
What is cracking?
A
Large hydrocarbon molecules being broken down into smaller molecules
7
Q
What does cracking produce?
A
Saturated hydrocarbons used as fuels. And unsaturated hydrocarbons (called alkenes)
8
Q
2 ways cracking can be done:
A
- Steam cracking. Heating a mixture of hydrocarbon vapours and steam to a very high temperature
- Catalytic cracking. Passing hydrocarbon vapours over a hot catalyst
