C10. Metals

Question 1

Action of heat on solid metal carbonate

Answer 1

Potassium/sodium carbonate –> no reaction

Metal carbonate –> metal oxide + carbon dioxide

Question 2

Action of heat on solid metal nitrate

Answer 2

Potassium/sodium nitrate –> potassium/sodium nitrite + oxygen
Metal nitrate –> metal oxide + nitrogen dioxide + oxygen

Question 3

Action of heat on solid metal hydroxide

Answer 3

Potassium/sodium hydroxide –> no reaction

Metal hydroxide –> metal oxide + water

Question 4

Uses of mild steel (99.7% iron + 0.3% carbon)

Answer 4

1. Car bodies

2. Machinery

Question 5

Uses of stainless steel (70% iron + 20% chromium + 10% nickel)

Answer 5

1. Cutlery

2. Pipes in chemical factories

Question 6

Uses of aluminium

Answer 6

1. Manufacture of aircraft

2. Food containers

Question 7

Uses of copper

Answer 7

1. Electrical wiring

2. Cooking utensils (saucepans & saucepan bases)

Question 8

Uses of zinc

Answer 8

1. Galvanising iron/steel

2. Making brass (70% copper + 30% zinc)