Making our resources

Question 1

What is corrosion

Answer 1

corrosion is the destruction of materials by chemical reactions with substances in the environment.
Rusting is an example of corrosion. It is caused by iron reacting with oxygen and WATER from the environment.
It can be prevented in 2 ways: physical barriers, sacrificial protection

Question 2

What physical barriers can be used to protect against corrosion

Answer 2

grease, paint, a thin layer of metal

Question 3

what is sacrificial protection

Answer 3

adding a more reactive metal to the surface of a material
the more reactive substance will react with the environment and not the main material.
for example iron is galvanised with zinc. the zinc then reacts with oxygen and water in the place of iron.

Question 4

what are two alloys of copper

Answer 4

brass

bronze

Question 5

what are steel alloys made from

Answer 5

iron, carbon and other metals

Question 6

what is a property of aluminium alloys

Answer 6

low densities

Question 7

give two examples of clay ceramics

Answer 7

pottery and bricks

Question 8

what is a composite

Answer 8

a mixture of a main material (called a matrix) with fragments/ fibres of other materials (called reinforcements) that are added

Question 9

name 2 composites

Answer 9

plywood and reinforced concrete

Question 10

What is the chemical name for rust?

Answer 10

Hydrated iron(III) oxide