Chemistry - Chapter 3 (P1)

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Where are metals found?
Metals are found in the Earth's curst
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Give three physical propertites of metals
Strong/ conducts heat and electricity/ hard to break/ can be bent hammered into different shapes.
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What are most metals combined with?
They are mostly combined with oxygen
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What is an ore?
An ore is a rock which contains enough metal making it economically worthwhile to extract them
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Why are some ores concentrated? Give an example.
They are concentrated before they are extracted to remove the unwanted rocky material. E.g. copper is concentrated before reduction.
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What process purifies the extracted metal?
Electrolysis
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What is a native metal? Give two examples.
A native metal is so unreactive that it is found on the Earth, as the metal themselves. E.g. gold and silver.
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What is phytomining?
Using plants to absorb metal compounds.
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What is bio-leaching?
Using bacteria to separate copper from copper sulfide
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What is electroysis?
Breaking down of a substance using electricity
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Why is electrolysis used?
Electrolysis is used to extract ores, if they are above carbon in the reactivity series.
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What is reduction?
Reduction is using carbon to extract metals
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Why is reduction used?
Reduction is used to extract metals using carbon, if they are below the reactivity series.
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What happens when an ore is extracted by reduction?
The oxygen is removed from it
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Disadvantages of electrolysis
1) It is expensive 2. Uses a lot of energy to extract the ore
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Why do we purify metals?
To make the impure metal pure
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How do we extract iron?
We extract iron using reduction
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What is the percentage of iron from a blast furnace?
96%
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Why is iron extracted from iron ore by reduction with carbon?
Iron is less reactive than carbon
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Why is aluminium extracted from aluminium ore by electrolysis?
Aluminium is more reactive than carbon
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What happens to iron oxide in a blast furnace?
It is reduced to form iron
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Other cards in this set

Card 2

Front

Give three physical propertites of metals

Back

Strong/ conducts heat and electricity/ hard to break/ can be bent hammered into different shapes.

Card 3

Front

What are most metals combined with?

Back

Preview of the front of card 3

Card 4

Front

What is an ore?

Back

Preview of the front of card 4

Card 5

Front

Why are some ores concentrated? Give an example.

Back

Preview of the front of card 5
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