Alkenes and Ethanol

Recap from last lesson- To evaluate 2 ways in which ethanol fuel is made

To extract oil from a fruit like avocados

To describe these fats SATURATED FAT

UNSATURATED FATHYDROGENATED FAT

State how they effect health

To make a slimy polymer and investigate how it can be made to have different properties

To be able to Describe an alkene and explain how they are

made. Draw a diagram of ethene State what is meant by an unsaturated

molecule and the test for unsaturated molecules

Explain how polymers are made from alkenes Describe how polymers with different physical

properties are made and uses of plastics

Have a double bond between the carbon atoms

They are made from cracking long chain hydrocarbons eg Kerosene

Are very useful to make lots of other things

Unsaturated means they can make more bonds by opening up a double bond

Their general formula is CnH2n

Make 2 ethene molecules . These small molecules are called monomers

Break the bonds between the 2 ethene molecules and join the carbon atoms into a chain. You now have a POLYMER

Long chains of ethene molecules make POLYETHENE

Styrene forms polystyrene

Their physical properties are different because:

1. They are made from different monomers

2. The monomers can be polymerised at different temperatures and pressures.

If this is polymerised at high temperatures and pressures it is flexible and has low density- plastic bags can be made

If it is polymerised at low temperatures with a catalyst it is rigid and dense plastic cups can be made

This means it can be used for different things

Tooth filings

New plasters- the top comes off and when light gets to the layer below the sticky property disappears

What is a monomer? What is a polymer? How are polymers formed? Name some polymers and their uses. Why can they have different properties?

Ehanol is cheap to make from oil but why is this not a brilliant idea?

Why is this a better way to make ethanol?

What are the problems of making ethanol like this?

List the advantages and disadvantages of making ethanol from oil or from sugar and yeast