C2 OCR

HideShow resource information
Name a material that is made of atoms of one element only
A gold bar
1 of 17
Name a material we use that comes from: a) plants b) animals
a) wood b) wool
2 of 17
What is the advantage of synthetic rubber over natural rubber?
You can control its properties making it suitable for different purposes
3 of 17
Whats the difference between strength and stiffness?
Strength - is how good a material is good at resisting a force Stiffness - good at not bending when a force is applied to it
4 of 17
The hardest material found in nature?
Diamond
5 of 17
Definition of Density
Density is a material's mass per unit volume.
6 of 17
What does crude oil contain?
Crude oil is a mixture of Hydrocarbons
7 of 17
Why do big hydrocarbon molecules have higher boiling points than small ones?
More Energy is needed to break the bonds
8 of 17
What are most of the hydrocarbons in crude oil used to produce?
Fuels
9 of 17
Briefly describe polymerisation
Carbon-based - Under high pressure many small molecules polymerise to form long chains called polymers
10 of 17
Example of a product that of a product where a polymer has replaced a natural material
Synthetic fibers replaced cotton or wool
11 of 17
How does the arrangement of polymer chains affect the density of a material?
If polymer chains packed close together = High density If polymer chains spread out = Low density
12 of 17
What would you add to a polymer to make it stiffer and stronger?
Adding crosslinks to the polymers
13 of 17
How do plasticizers work?
Plasticizers can be added to make the polymer softer. Plasticizers work by getting in between the polymer chains and reducing the forces between them
14 of 17
What are the properties of a crystalline polymer?
Chains close together, Higher density, stronger, higher meltingpoint
15 of 17
What is nanotechnology?
Nanotechnology is the branch of technology dealing with making and use of nanoparticles
16 of 17
Give two examples of uses of nanomaterials
1) Suncream 2) Surgical masks
17 of 17

Other cards in this set

Card 2

Front

Name a material we use that comes from: a) plants b) animals

Back

a) wood b) wool

Card 3

Front

What is the advantage of synthetic rubber over natural rubber?

Back

Preview of the front of card 3

Card 4

Front

Whats the difference between strength and stiffness?

Back

Preview of the front of card 4

Card 5

Front

The hardest material found in nature?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Crude oil, cracking and hydrocarbons resources »