Chemistry C1 3.1 Extracting metals.

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Where are metals usually found?
In the Earth's crust.
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In what state are metals's usually found?
They are often combined chemically with other elements such as oxygen.
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What is an ore?
Rock that contains enough metal to make it worth extracting the metal.
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What does the method we use to extract a metal depend on?
It's reactivity.
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In what state are unreactive metals found in?
A few unreactive metals, such as gold, are found in the Earth as the metal.
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When can the oxides of metals be reduced using carbon?
When the oxides of metals are less reactive than carbon.
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What does mining for ores often involve?
Digging up large amounts of rock. The ore may need to be concentrated before the metal is extracted, these processes can produce large amounts of waste and may have major impacts on the environment.
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How can unreactive metals such a gold be separated from rocks?
By physical methods.
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How do most metals have to be extracted from rock?
Because most metals are found as compounds they need to be extracted by chemical reactions.
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What chemical reaction can be used to extract metals from compounds?
Displacement using a more reactive element, metals which are less reactive than carbon can be extracted from their oxides by heating with carbon.
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What is the name of the reaction which takes place when metals are extracted from their oxides by heating with carbon?
A reduction reaction as carbon removes the oxygen from the oxide to produce the metal. This method is used commercially if possible.
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What is an ore?
Rock from which metal can be extracted economically.
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What metals have oxides that can be reduced by carbon?
Examples are zinc, iron, tin, lead and copper.
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What do we call the removal of oxygen from a metal oxide?
Reduction.
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***YOU SHOULD BE ABLE TO WRITE A BALANCED SYMBOL EQUATION FOR THE REDUCTION OF A NAMED METAL OXIDE BY CARBON SO LOOK IT UP**
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Card 2

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In what state are metals's usually found?

Back

They are often combined chemically with other elements such as oxygen.

Card 3

Front

What is an ore?

Back

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Card 4

Front

What does the method we use to extract a metal depend on?

Back

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Card 5

Front

In what state are unreactive metals found in?

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