Polymers Chem

Question 1

Definition polymer

Answer 1

Is a substance that has molecules made of long chains, which contain repeated groups of atoms

Question 2

Natural polymers

Answer 2

E.g. Rubber
Polymer obtained from or certain trees
(Used to make some glues)

Question 3

What can happen to the properties

Answer 3

It’s properties can be changed by vulcanisation

Question 4

Vulcanisation

Answer 4

Rubber is heated with sulphur- a reaction occurs and forms cross-links between the long molecules

Question 5

Cross-links

Answer 5

Make rubber rubber much harder and tougher thanks to the cross links, molecules can’t slid past each other which makes the rubber always go back to its original position.

Question 6

Other examples of synthetic polymers

Answer 6

DNA
Proteins
Starch
Cellulose

Question 7

Not natural polymers

Answer 7

Have been developed by scientists
Have been made using raw material from crude oil
Made in laboratories and factories by polymerisation

Question 8

Polymerisation

Answer 8

Lots of small molecules called monomers joins together in chains

Question 9

…………….._______________||||||||||||||»»»»«««

Answer 9

Poly(—–) is always made by the thing inside the brackets

E.g. Poly( ethene ) is made form ethene