Metals

Question 1

Physical properties of metals

Answer 1

• good conductors of electricity & heat
• malleable
• ductile
• lustrous
• sonorous
• high density & high tensile strength ( transition metals )
• normally have high MP & BP ( except Group I metals )

Question 2

Chemical properties of metals

Answer 2

1) form basic oxides reacting with dilute acids to form a salt & water
2) can react with dilute acids to form salts & H2
3) form ionic compounds with non-metals
4) form compounds with hydrogen

Question 3

Alloys

Answer 3

mixture of 2 / more metals and sometimes non-metals

Question 4

Uses of alloys

Answer 4

• increase resistance to corrosion
• increase tensile strength
• improve physical appearance
• lower melting point of a metal

Question 5

Iron alloys

Answer 5

• mild steel
• stainless steel

Question 6

Aluminium alloys

Answer 6

• magnalium
• duralium

Question 7

Copper alloys

Answer 7

• brass : copper + zinc
• bronze : copper + tin
• cupronickel : copper + nickel

Question 8

Lead alloy

Answer 8

• solder : lead + tin
• used in electrical parts of appliances

Question 9

Properties of H2

Answer 9

• colourless
• odourless
• insoluble in water
• highly flammable gas
• burns in air to form water
• one of the lightest gases aver known
• reducing agent