metals

Question 1

copper alloys

Answer 1

bronze- made by mixing copper with tin- used to make ship propellers because of its toughness and resistance to corrosion
brass- copper with zinc-musical instruments

Question 2

aluminium alloys

Answer 2

used to build aircrafts, since its light weight but strong
army plating
tanks and other military vehicles

Question 3

gold alloys

Answer 3

usually alloyed with copper to make jewellery

Question 4

how is iron extracted from its ore?

Answer 4

by reducing it using carbon in a blast furnace, the main agent is carbon monoxide gas.

Question 5

carbon steels

Answer 5

Low carbon steels:
-easily shaped
-less likely to shatter on impact with a hard object
High carbon steels:
-very strong but brittle

Question 6

alloy steels

Answer 6

Low alloy steels:
-more expensive that carbon steels
Stainless steels:
-resistant to corrosion

Question 7

what do carbonates form when reacted with a dilute acid?

Answer 7

forms a salt, water and carbon dioxide

Question 8

testing for carbon dioxide

Answer 8

limewater turns cloudy, a precipitate of insoluble carbonate causes the cloudiness

Question 9

what do metal carbonates decompose on?

Answer 9

heating to form the metal oxide and carbon dioxide

Question 10

oxidation

Answer 10

loss of electrons

Question 11

reduction

Answer 11

gain electrons