Obtaining Substances Flashcards
1
Q
Why are hydrocarbons cracked?
A
To produce smaller, more useful molecules
2
Q
What happens when hydrocarbons are heated?
A
They vaporise
3
Q
Which 2 methods can crack vaporised hydrocarbons?
A
Passing over a hot catalyst, or mixing with steam and heated to a very high temperature so that thermal decomposition will occur
4
Q
What do the products of cracking include?
A
Alkanes and alkenes
5
Q
What are alkenes?
A
Unsaturated hydrocarbons (have double bonds)
6
Q
What happens when an alkene is reacted with bromine water?
A
It turns it from orange to colourless
7
Q
What are some of the products of cracking useful as?
A
Fuels
