1
Q
alkane
A
a structures hydrocarbon
2
Q
general formula for alkanes
A
CnH2n + 2
3
Q
what is a homologous series
A
- a group with the same different general formula but a different molecular formula
- an alkane is in the homologous series
4
Q
why does boiling point increase with chain length
A
- more contact points between longer chains
- greater intermolecular forces of attraction
5
Q
why does flammability decrease with chain length
A
longer chains are liquids at room temp, preventing oxygen from reacting with combustion
6
Q
why does viscosity change with chain length
A
longer chains have greater forces of attraction between hydrocarbon molecules
7
Q
formations of complete combustion
A
water and carbon dioxide
8
Q
formations of incomplete combustion
A
carbon monoxide
soot - unreacted carbon
9
Q
cracking
A
splitting up long chains of hydrocarbons into smaller ones
10
Q
conditions needed for cracking
A
- 400 to 700 degrees Celsius
- zeolite catalyst
Chemistry
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