Topic 4 - Obtaining And Using Metals

Question 1

Metals that react to form compounds are found naturally in

Answer 1

The earths crust

Question 2

If a compound contains enough of the metal to make it worthwhile extracting it’s called

Answer 2

A metal ore

Question 3

Metal ores are a

Answer 3

Finite resource - limited amount

Question 4

The more reactive a metal is

Answer 4

The harder it is to extract from a compound

Question 5

Metals react with oxygen to form oxides. What is this process called?

Answer 5

Oxidation

Question 6

A reaction that separates a metal from its oxide is called a

Answer 6

Reduction reaction

Question 7

Methods of extraction are linked to

Answer 7

The order of reactivity

Question 8

Only metals that are less reactive than carbon can be extracted by

Answer 8

Reduction reaction with carbon - this is done by heating the ore with carbon

Question 9

Very reactive metals form

Answer 9

Very stable ores

Question 10

Elements that are more reactive than carbon have to be extracted using

Answer 10

Electrolysis

Question 11

Electrolysis uses electricity to

Answer 11

Separate the metal from the other elements in the compound

Question 12

What are typical properties of metals

Answer 12

• strong but can be bent
• conductors of heat
• conduct electricity well

Question 13

What are the properties of aluminium

Answer 13

• low density
• corrosion resistant
• pure aluminium isn’t particularly strong but can form hard alloys
• useful structural material
• can be used for window frames, electricity cables, aircraft

Question 14

What are the properties of copper?

Answer 14

• hard/strong
• high melting point
• good conductor of electricity
• useful for electrical wires or pipes

Question 15

What are the properties of gold?

Answer 15

• shiny
• easy to shape
• used for jewellery or anything where you need a metal that won’t react with anything e.g tooth fillings Or in electrical circuits

Question 16

Corrosion in metals occurs because of

Answer 16

Metals being oxidised

Question 17

Allots are harder than pure metals because

Answer 17

• different elements have different sized atoms
• if a different element is added to a metal, the smaller atoms will upset the layers of pure metal atoms and make it more difficult for them to slide over each other

Question 18

Smart alloys have a

Answer 18

Shape memory ( they return to their original shape)

Question 19

An example of a smart alloy is

Answer 19

Nitinol (alloy of nickel and titanium)

Question 20

Metals that are Unreactive don’t tend to form

Answer 20

Compounds