Metals
5.0 / 5 based on 1 rating
- Created by: nina
- Created on: 31-05-13 15:23
what does the earth's crust contain?
metals and metal compounds mixed with other substances
1 of 38
what is a metal ore?
a rock containing a metal or metal compound that is high enough in concentration to make it economic to extract
2 of 38
why are metals extracted from what they're mixed with?
to make them useful
3 of 38
what does the ease by which a metal is extracted depend on?
its reactivity
4 of 38
which metals are extracted by electrolysis?
the most reactive
5 of 38
how are unreactive metals like gold found?
in their native state
6 of 38
what are 3 advantages of mining?
provides jobs, invests in local area, metal is a useful resource
7 of 38
what are 3 adisdvantages of mining?
ruins habitats, air/noise/visual pollution, more traffic
8 of 38
when can carbon be used to extract metals from metal oxides?
if the metal is lower than carbon in the reactivity series
9 of 38
how ix oxygen removed from a metal oxide?
via reduction
10 of 38
when a metal oxide is heated with carbon, what two products are formed?
metal as an element and carbon dioxide
11 of 38
what will a less reactive metal be displaced by from its compounds?
a more reactive metal
12 of 38
where is iron extracted?
in a blast furnace
13 of 38
the common iron ore, haematite, is mainly iron mixed with what?
sand
14 of 38
when iron ore, coke and limestone are heated in a blast furnace, what products are formed?
carbon dioxide and iron oxide
15 of 38
when iron oxide reacts with carbon monoxide in the blast furnace, what two products are formed?
Iron and carbon dioxide
16 of 38
what happens to limestone in a blast furnace?
it decomposes to form calcium oxide which reacts with acidic impurities to form a ****
17 of 38
why is pure iron not that useful?
the layers of atoms can slide over each other making it too soft and easily formed
18 of 38
what happens when another element is added to a metal to make an alloy?
the properties of the metal change
19 of 38
why are alloys harder than pure metals?
the added element means the arrangement of atoms becomes distorted so the layers can't slide over each other
20 of 38
what is added to iron to make a steel alloy?
carbon
21 of 38
what are the properties of: low carbon steel, high carbon steel, stainless steel?
low carbon steel:easily shaped; high carbon steel:hard; stainless steel:hard and doesn't rust
22 of 38
blast furnace iron contains about 96% iron so the impurities make it very brittle. what is one if its limited uses?
using it as cast iron because of its strength in compression
23 of 38
copper, gold, and aluminium are too soft for many uses so what metals are added to them to make them harder?
zinc added to copper to make brass; tin added to copper to make bronze; copper added to aluminium to make duralmin; copper added to gold to make 18 carat gold
24 of 38
why are transition metals useful as structural metals?
they're good conductors of heat, electricity, and are malleable
25 of 38
why is copper used for electrical wiring and plumbing?
good conductor or electricity and heat and doesn't react with water
26 of 38
what is smelting?
extracting copper by heating copper ores in a furnace
27 of 38
what is the process the purifies impure copper?
electrolysis
28 of 38
why are new methods of extracting copper being developed?
copper rich ores are running out and mining + extraction have big environmental impacts
29 of 38
what happens in phytoming?
roots of plants absorb copper compounds. the plants are then burned to produce ash which contains the copper compounds, which can then be smelted
30 of 38
what happens in bioleaching?
bacteria is used to produce solutions called leachates which contain copper compounds
31 of 38
how can copper be obtained from copper salt solutions?
by electrolysis
32 of 38
how is scrap iron used to extract copper?
by displacement
33 of 38
what happens in electrolysis?
positive ions move towards the negative electrode, uses electricity to break up a compound
34 of 38
why are aluminium and titanium useful metals?
they have a low density and are resistant to corrosion
35 of 38
why can't aluminium and titanium by extracted by carbon?
they're more reactive than carbon
36 of 38
why are current methods to extract aluminium and titanium expensive?
require a lot of energy and there are many stages in the processes
37 of 38
give 4 reasons why metals should be recycled
extraction uses limited resources, is expensive, requires a lot of energy, overall bad effect on the environment
38 of 38
Other cards in this set
Card 2
Front
what is a metal ore?
Back
a rock containing a metal or metal compound that is high enough in concentration to make it economic to extract
Card 3
Front
why are metals extracted from what they're mixed with?
Back
Card 4
Front
what does the ease by which a metal is extracted depend on?
Back
Card 5
Front
which metals are extracted by electrolysis?
Back
Similar Chemistry resources:
0.0 / 5
0.0 / 5
0.0 / 5
0.0 / 5
0.0 / 5
0.0 / 5
4.0 / 5 based on 1 rating
0.0 / 5
0.0 / 5
0.0 / 5
Comments
No comments have yet been made