EXTRACTION AND USES OF METALS

Question 1

most metals are extracted from

Answer 1

the earths crust

Question 2

unreactive metals are found

Answer 2

in the earths crust as an uncombined element

Question 3

reactive metals are found

Answer 3

in the earths crust combined with other metals

Question 4

the tendency to be oxidised is linked to

Answer 4

how reactive a metal is

Question 5

what metals are less resistant to oxidation

Answer 5

reactive metals

Question 6

extraction of metals is determined by thier

Answer 6

position in the reactivity series

Question 7

most reactive metals are extracted by

Answer 7

electrolysis of molten chloride or oxide

Question 8

is electrolysis expensive and why

Answer 8

yes because large amounts of electricity are needed

Question 9

what metals are extracted by electrolysis (6)

Answer 9

potassium
sodium
lithium
calcium
magnesium
aluminium

Question 10

how are lesser reactive metals extracted

Answer 10

by heating with a reducing agent like carbon or carbon monoxide

Question 11

what metals are extracted by heating with a reducing agent (3)

Answer 11

zinc
iron
copper

Question 12

is heating by using a reducing agent expensive and why

Answer 12

NO
as carbon is cheap and can be a source of heat

Question 13

silver and gold are extracted as

Answer 13

pure elements

Question 14

extraction of a metal from its ore involves

Answer 14

removing oxygen from metal oxides

Question 15

If the ore contains a metal which is below carbon in the reactivity series then the metal is extracted by

Answer 15

reaction with carbon in a displacement reaction.

Question 16

The raw material iron core or hematite is used as a source of what metal

Answer 16

iron

Question 17

coke is used to

Answer 17

provide carbon

Question 18

limestone is used for

Answer 18

neutralising acidic impurities

Question 19

uses of aluminium (4)

Answer 19

aircraft bodies
saucepans
overhead electrical cables
food cans

Question 20

why is aluminium used for food cans

Answer 20

it is non toxic, and resistant to corrosion and acidic food stuffs

Question 21

why is aluminium used for electrical cables

Answer 21

very good conductor of electricity

Question 22

why is aluminium used for saucepans

Answer 22

very good conductor of heat and unreactive

Question 23

uses of copper (3)

Answer 23

electrical wiring
saucepans
water pipes

Question 24

why is copper used for electrical wiring

Answer 24

ductile and very good conductor of electricity

Question 25

why is copper used for saucepans

Answer 25

very good conductor of heat, unreactive metal

Question 26

why is copper used for water pipes

Answer 26

doesn't react with water - non toxic and malleable

Question 27

uses of iron (2)

Answer 27

building material catalyst

Question 28

why is iron used for building material

Answer 28

Good strength, malleable and ductile, relatively inexpensive

Question 29

why is iron used as a catalyst

Answer 29

Increases the rate of reaction without being used up

Question 30

3 types of steel

Answer 30

mild high carbon stainless

Question 31

what is mild steel used for and why

Answer 31

Car body panels and wiring beacuse its malleable and soft

Question 32

what is high carbon steel used for and why

Answer 32

tools because its hard

Question 33

what is stainles steel used for and why

Answer 33

cutlery, sinks, chemical plants because its Strong and resistant to corrosion

Question 34

what is an alloy

Answer 34

a mixture of 2 or more metals or a metal and a non metal

Question 35

alloy properties

Answer 35

- harder and stronger - more resistant to corrosion

Question 36

why are alloys more useful than pure metals

Answer 36

because their properties are enhanced ( will be harder and less prone to corrosion)

Question 37

are alloys mixtures or compounds

Answer 37

mixtures

Question 38

what happens if a force is applied to a pure metal

Answer 38

the layers can slide over each other meaning the metal is malleable and ductile

Question 39

in metals, the atoms are all ___ size

Answer 39

equal

Question 40

in alloys, the atoms are all ___ sizes

Answer 40

different

Question 41

what does it mean that the atoms are different sizes in alloys

Answer 41

it distorts the regular arrangement of atoms the metal so it is harder for the layer to slide over one another

Question 42

so talking about atom sizes why are alloys better to use than metals

Answer 42

as the atoms are all different sizes, it distorts the regular arrangement of atoms the metal so it is harder for the layer to slide over one another