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GCSE
Gcse Chemistry
Limestone - Reactions Of
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Q.1
On heating, limestone breaks down into calcium oxide and carbon dioxide. What is the name of this type of reaction?
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Neutralisation
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Combustion
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Thermal decomposition
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Reduction
Q.2
In the presence of carbon dioxide, what happens to limewater?
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It turns brown
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It turns cloudy
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It decolourises
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It goes brick red
Q.3
Calcium hydroxide dissolves in water to produce what?
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Limewater
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Quicklime
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Slaked lime
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Limestone
Q.4
The chemical name for the main mineral that is found in limestone is...
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calcium carbide
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calcium carbonate
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sodium carbonate
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sodium chloride
Q.5
When calcium hydroxide is reacted with carbon dioxide, the substances produced are...
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Calcium oxide and oxygen
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Calcium sulfate and water
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Calcium carbonate and oxygen
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Calcium carbonate and water
Q.6
Limestone is badly affected by acid rain. Choose the equation below that describes this reaction.
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CaCO3 + H2SO4 → CaSO4 + CO2 + O2
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CaCO3 + H2SO4 → CaSO4 + CO2 + H2O
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CaO + H2SO4 → CaSO4 + H2O
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CaCO3 + H2SO4 → CaSO3 + CO2
Q.7
Calcium oxide reacts with what to form calcium hydroxide?
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Hydrogen
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Carbon dioxide
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Water
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Oxygen
Q.8
Which gas is given off when calcium carbonate is heated strongly?
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Carbon dioxide
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Nitrogen
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Water vapour
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Oxygen
Q.9
We can use limewater to test for the presence of which gas?
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Carbon dioxide
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Oxygen
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Methane
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Nitrogen
Q.10
Choose the correct equation for the reaction that produces slaked lime (calcium hydroxide).
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CaO + H2O → CaOH
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CaO + H2O → Ca(OH)3
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CaCO3 + O2 → CaO
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CaO + H2O → Ca(OH)2
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