3.3.3: Addition polymers

Question 1

Polymers

Answer 1

Long chain molecules formed when lots of small molecules (monomers) join together

Question 2

Types of polymers

2

Answer 2

natural or synthetic

Question 3

Example of a natural polymer

Answer 3

DNA

Question 4

Example of a synthetic polymer

Answer 4

Polythene

Question 5

Addition polymers

Answer 5

The double bonds in alkenes open up and join together to make long chains called polymers.
Addition polymerisation

Question 6

What does n stand for

Answer 6

repeating units

Question 7

Substituted alkene

Answer 7

An alkene where one of the hydrogen atoms has been swapped for another atom or group

Question 8

Properties of polymers

saturated?

Answer 8

Alkenes are unsaturated but become saturated when polymers as there are only single bonds in the carbon chin and the double bonds open up

Question 9

Properties of polymers

polarity?

Answer 9

The main carbon chain in alkenes is usually non-polar

Question 10

Properties of addition polymers

reactivity?

Answer 10

v unreactive due to saturation and non-polar

Question 11

Stronger and more rigid polymers

Answer 11

Longer chains with less branches due to stronger intermolcular forces

Question 12

PVC

Answer 12

poly(chloroethene)

an addition polymer formed from chloroethene monomers

Question 13

Plasticisers

Answer 13

Chemicals that make polymers bendier

Question 14

How do plasticisers work?

Answer 14

The molecules get between the polymer chains and push them apart which reduces the strength of intermolecular forces between the chains which makes them slide around more = more flexible

Question 15

Uses of plasticised PVC

3

Answer 15

electrical cable insulation
flooring tiles
clothing