Topic 5 - Products From Oil

These are revision notes on AQA Chemestry1, topic 5, Products from Oil.

Main Sub topics - Polymers, cracking, Ethanol.

HideShow resource information
  • Created by: Elsie_
  • Created on: 12-06-12 20:59
Preview of Topic 5 - Products From Oil

First 119 words of the document:

These are revision notes on AQA Chemestry1, topic 5, Products from
Cracking means s p l i t t i n g u p long chain hydrocarbons
To do this we use a high temperature and a catalyst.
Why is cracking useful?
Cracking produces fuels such
as petrol and paraffin. It also
produces ethene which we
use for making polymers
How do we actually crack
long chain hydrocarbons?
1. We VAPORISE long chain hydrocarbons
2. The vapour is passed over a powdered catalyst at about
400 ­ 700C
3. The long chain molecules crack on the surface of the
catalyst (usually Aluminium oxide)

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

An example of this is kerosene C10H22 there are LOTS of this
in crude oil and not enough of the shorter molecules we want.
So we crack it into Octane C8H18 (petrol) and Ethene C2H4
(used to make polymers).
The Alkene Test
Alkenes are hydrocarbons with one C=C bond. They are
unsaturated which means they will react with other things.
We test for Alkenes by adding bromine water.…read more

Page 3

Preview of page 3

Here's a taster:

Positives: It a renewable source of energy, it's cheaper to
make and it can be used as a fuel.
Negatives: It's not very concentrated so it has to be distilled
and filtered.
Alkenes are used to make polymers. We make polymers by
joining lots of little alkene molecules (monomers) to form very
large molecules called polymers.
We do this by using pressure
and a catalyst.
For example we join up lots of
little Ethene monomers to
produce Polyethene.…read more

Page 4

Preview of page 4

Here's a taster:

In the same way if you join up lots of propene molecules you get
Polypropene (just put a `Poly' in front!)
Properties of polymers
Different polymers have different properties based on the
length of the hydrocarbon it was made from.
The physical properties of polymers are affected by the
temperature and pressure of the polymerisation.
If Polyethene is made at 200C with 2000 atmospheres of
pressure it is flexible with a low density.…read more


No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all resources »