3.3.2 Alkanes Flashcards
(10 cards)
1
Q
why is thermal cracking reactions carried out in industry?
A
to make products much are in greater demand
2
Q
what are the essential features of fractional distillation?
A
- fractions have different boiling points
- boiling points depend on chain length
- cooler at the top
- longer chain hydrocarbons found at the bottom
3
Q
what’s the catalyst used in catalytic cracking?
A
zeolite
4
Q
what is cracking?
A
breaking a long chain hydrocarbon into smaller molecules
5
Q
what is the equation to show what happens in a catalytic converter?
A
2CO + 2NO —> 2CO2 + N2
6
Q
what are the features of thermal cracking?
A
- high temp and high pressure used
- produces high proportion of alkenes
7
Q
what are the features of catalytic cracking?
A
- produces aromatic compounds with carbon rings
- lower temp and normal pressure used
- zeolite catalyst used
8
Q
what catalyst does a catalytic converter use?
A
rhodium
9
Q
why does a branched chain isomer have a lower boiling point?
A
- lower SA
- less vdw
10
Q
what’s a substance that can remove sulfur dioxide and why?
A
- limestone
- neutralises the gas
