Chemistry C1 2.3 The 'limestone reaction cycle'

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Created by: Atlanta and Jacob
Created on: 27-04-16 19:27

What does the thermal decomposition of calcium carbonate produce?

Calcium oxide and carbon dioxide.

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Wha does calcium oxide react with water to produce?

Calcium hydroxide.

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What is calcium hydroxide and what can it be used for?

It is an alkali that can be used to neutralise acids.

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What does calcium hydroxide react with carbon dioxide to produce?

Calcium carbonate, the main compound in limestone..

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What examples are there of calcium hydroxide being used to neutralise acids?

It is used by farmers to neutralise acidic soils and in industry to neutralise acidic gases.

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How is limewater made?

Calcium hydroxide is not very soluble in water but dissolves slightly to make limewater.

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What is 'step 1' of the 'limestone cycle'?

Calcium carbonate (limestone) is strongly heated to produce calcium oxide and carbon dioxide is given off.

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What is 'step 2' of the 'limestone cycle'?

A little water is added to the calcium oxide produced in 'step 1' and calcium hydroxide is produced.

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What is 'step 3' of the 'limestone cycle'?

More water is added to the calcium hydroxide produced in 'step 2' and it is filtered to produce calcium hydroxide solution (limewater).

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What is 'step 4' of the 'limestone cycle'?

Carbon dioxide is added (this is the test for CO_(2)) to the calcium hydroxide solution (limewater) produced in 'step 3' and calcium carbonate (limestone) is produced.

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What is the word equation for the three reactions in the 'limestone cycle'?

Calcium carbonate (arrow symbol) calcium oxide + carbon dioxide then... calcium oxide + water (arrow symbol) calcium hydroxide then... calcium hydroxide + carbon dioxide (arrow symbol) calcium carbonate + water.

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**YOU NEED TO FIND AND LEARN BALANCED SYMBOL EQUATIONS FOR THE THREE REACTIONS IN THE LIMESTONE CYCLE***

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