Metals

Question 1

Transition metals can be hammered or…

Answer 1

bent into useful shapes.

Question 2

The strength of transition metals makes them useful…

Answer 2

building materials.

Question 3

Copper

Answer 3

• can be bent but still hard enough for plumbers to use
• it does not react with water
• conduct electricity and heat very well

Question 4

Uses of copper

Answer 4

• pipes that will carry water

- wires that will conduct electricity

Question 5

Copper alloy

Answer 5

• brass

- bronze

Question 6

Bronze

Answer 6

• Made by mixing copper with tin

- Used to make ship’s propellers, since it is tough and resistant to corrosion

Question 7

Brass

Answer 7

• copper and zinc
• much harder than copper
• can be pressed into complex shapes
• used to make musical instruments such as trumpets

Question 8

Aluminium

Answer 8

• low density for metal
• over 300 alloys of aluminium
• light-weight but strong
• to build aircraft
• other as an armour plating on tanks

Question 9

Gold alloys

Answer 9

• gold is alloyed with copper to make jewellery
• pure gold wears away more easily
• changing the proportion of two metals, different shades can be made

Question 10

Copper, aluminium and gold are alloyed with other metals to…

Answer 10

make them harder.

Question 11

Why can metals be shaped?

Answer 11

The layers of atoms in metals are able to slide over each other.

Question 12

Iron is extracted using

Answer 12

blast furnace.

Question 13

Oxidation

Answer 13

Is a gain of oxygen.

Question 14

Reduction

Answer 14

Is a loss of oxygen.

Question 15

Impurities in iron are from…

Answer 15

carbon and it makes the iron brittle, however, still hard.

Question 16

Cast iron

Answer 16

Iron coming directly from the blast furnace (around 96 percent pure). Used:

• engines
• wood-burning stoves
• manhole covers on the road

Question 17

Pure iron is…

Answer 17

too soft for most uses.

Question 18

Steel

Answer 18

An alloy of iron and carbon, sometimes some other element.

Question 19

Low carbon steel

Answer 19

-easily shaped

Question 20

High carbon steel

Answer 20

-very hard

Question 21

Stainless steel

Answer 21

Contain high percentage of chromium and nickel.

-resistant to corrosion