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Flashcards in Extracting metals Deck (21)
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1

What happens to ores

They are mined and may be concentrated before the metal is extracted and purified

2

What do most metals that are found as compounds require

Chemical reactions to extract the metal

3

How can metals less reactive than carbon be extracted from their oxides

By reduction with carbon

4

Give an example of this

Iron oxide is reduced in the blast furnace to make iron

5

How are metals that are more reactive than carbon such as aluminium extracted

By electrolysis of molten compounds
Use large amounts of energy so expensive

6

How can copper be extracted from copper rich ores

By heating the ores in a furnace
Smelting
Copper purified by electrolysis

7

What is bio leaching

Used bacteria to procure leachate solutions that contain metal compounds

8

What is phitomining

Using plants to absorb metal compounds you then burn the plants to produce ash which contains metal compounds

9

How do you get copper from solutions of copper salts

By displacement using scrap iron

10

Why recycle metals?

Mining uses lots of fossil fuels

11

Current methods of extracting aluminium and titanium from their oxides are expensive why?

Many stages in process

Large amounts of energy needed

12

How much iron from the blast furnace contains iron

96%
Impurities make it brittle So it has limited uses

13

What are steels

Alloys since they are mixtures of iron with carbon

14

Properties of low carbon steel

Easily shaped
Used in carbides

15

Properties of high carbon steel

Hard and flexible
Used in things needing stability (bridge)

16

Properties of stainless steel

Corrosion resistant
Used for cutlery

17

What are things with carbon

Less flexible

18

What is an alloy

Two or more metals mixed together

19

What happens to gold

It is soft so is mixed with zinc, copperC silvery, nickel to make them harder

20

Properties of aluminium

Very low density
Strong when alloyed

21

What do ores contain

Enough metal to make it economical to extract the metal