Metals YEAR 9

Question 1

Phytomining

Answer 1

Plants grown in lands containing copper compounds.
Plants intake copper and are burned to leave behind copper-rich ash

Question 2

Bioleaching

Answer 2

Uses bacteria to turn insoluble copper compounds into soluble ones

Question 3

Leaching

Answer 3

Use acid to react with insoluble copper compounds.
Forms leachate.
Copper extracted from Leachate via electrolysis or displacement.

Question 4

Displacement reaction

Answer 4

A less reactive metal is displaced from its compound by a more reactive metal

Question 5

Why are new methods being made to extract metals?

Answer 5

To be able to extract from low-grade ores

Question 6

What is rust

Answer 6

Iron Oxide
Fe2O3

Question 7

What is needed to form
rust

Answer 7

Oxygen and water

Question 8

Corrosion is

Answer 8

The gradual deterioration of a substance when it reacts with a substance in the environment

Question 9

Why are alloys stronger than pure metals

Answer 9

Particles are odd sizes
Prevents layers sliding over one another

Question 10

Galvanising

Answer 10

Iron or steel covered in zinc coat.
Prevents water or oxygen rusting it.
Also zinc is more reactive, so it oxidises instead of iron or steel

Question 11

Sacrificial protection

Answer 11

Iron put in CONTACT with a more reactive metal. More reactive metal oxidises rather than iron

Question 12

Four stages of Life Cycle Assessment

Answer 12

Obtain raw materials
Manufacture
Use
Disposal