Aluminum Oxide

Question 1

Aluminium properties

Answer 1

• Very light

- Melting point is 2000 degrees.

Question 2

Aluminium is produced from

Answer 2

aluminium oxide, produced by electrolysis.

Question 3

Cryolite

Answer 3

Added to lower the melting point. This takes less energy and safes money.

Question 4

Reduction

Answer 4

is a gain of electrons.

Question 5

Oxidation

Answer 5

is loss of electrons.

Question 6

Positive aluminium ions moves to…

Answer 6

negative electrode, gain 3 electrons, forming aluminium metal.

Question 7

Negative oxygen ions move to…

Answer 7

positive electrode, loss 2 electrons forming oxygen gas.

Question 8

Oxygen gas reacts with….

Answer 8

carbon anode forming CO2, so electrode needs to be replaced.

Question 9

Half equations for Al

Answer 9

Al3+ + 3e- → Al This is called reduction.

Question 10

Half equations for O

Answer 10

2O2- → O2 + 4e- This is called oxidation.

Question 11

What is the name of aluminium ore?

Answer 11

Bauxite, which contains an aluminium oxide and iron impurities.

Question 12

First, bauxite is…

Answer 12

separated from the iron impurities to form pure aluminium oxide.

Question 13

Order of discharge

Answer 13

Halide ions>hydroxide ions>all other negatively charged ions