Extraction and corrosion of metal

Question 1

Ore

Answer 1

naturally occuring mineral from which a metal can be extracted

Question 2

hematite

Answer 2

major ore of iron (iron oxide)

Question 3

limestone

Answer 3

Calcium carbonate (CaCO₃)

Question 4

mineral

Answer 4

natural occuring rock that contains a particular compound

Question 5

slag

Answer 5

molten mixture of impurities (calcium silicate) formed in the blast furnace

Question 6

Carbon dioxide reacts with coke

Answer 6

CO₂ + C –> 2CO

Question 7

hot air reacts with coke

Answer 7

C+ O₂ –> CO₂

Question 8

reduction of iron ore

Answer 8

3CO + Fe₂O₃ –> 3CO₂ + 2Fe

Question 9

Decomposition of limestone forming slag

Answer 9

CaCO₃ –> CaO + CO₂
CaO + SiO₂ –> CaSiO₃

Question 10

Corrosion

Answer 10

The process that takes place when metals and alloys are chemically attacked by oxygen, water or any other substances found in their imidiate environment

Question 11

bauxite

Answer 11

the major ore of aluminium (Al₂O₃)

Question 12

Cryaolite

Answer 12

Sodium Aluminium flouride Na₃AlF₆

Question 13

Electrolytic cell

Answer 13

Cell consisting of an electrolyte and 2 electrodes

Question 14

Rusting

Answer 14

Corrosion of iron and steel to form rust

Question 15

Galvanising

Answer 15

protection of iron and steel objects by coating with a layer of zinc

Question 16

Sacrificial protection

Answer 16

method of rust protection involving attachment of blocks of more reactive metal than iron to a structure