OCR AS Chemistry F322 Hydrocarbons Quiz

Hydrocarbons quiz

?
  • Created by: Natasha
  • Created on: 09-04-12 16:55
What is the general fromula of an alkene?
CnH2n
1 of 7
In combustion, the longer the chain...
the more oxygen that will be needed
2 of 7
Why are cyclic hydrocarbons added to petrol?
To improve combustion
3 of 7
In the initiation step of free radical substitution what type of fission takes place?
Homolytic
4 of 7
In alkanes, as branching increases...
the boiling point decreases.
5 of 7
In alkanes, as the chain becomes longer why does the boiling point increase?
There are stonger Van der Waals forces
6 of 7
What type of E/Z isomerism has identical atoms on the same side of the molecule?
Cis (Z)
7 of 7

Other cards in this set

Card 2

Front

In combustion, the longer the chain...

Back

the more oxygen that will be needed

Card 3

Front

Why are cyclic hydrocarbons added to petrol?

Back

Preview of the front of card 3

Card 4

Front

In the initiation step of free radical substitution what type of fission takes place?

Back

Preview of the front of card 4

Card 5

Front

In alkanes, as branching increases...

Back

Preview of the front of card 5
View more cards

Comments

Liam Crawford

Report

For question 6, there are no lone pairs so there is no hydrogen bonding; there is if its an alcohol due to the OH group but alkanes have only van der Waals. as you increase the chain length you have more points of contact so the van der Waals forces increases. Also cyclic alkenes do improve combustion because they are weaker so easier to break for somplete combustion. however this also reduces the harmful fumes aka Carbon monoxide- which is produced when incomplete combustion happens often with aliphatic alkenes.

ELectrica!

Report

i agree, cyclic alkenes do improve combustion because they are smaller/weaker so easier to break for complete combustion

Similar Chemistry resources:

See all Chemistry resources »See all Functional Groups resources »