What is the main rock which limestone is made from?
Calcium Carbonate
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Where were some older forms of limestone formed?
From the remains of tiny animals and plants that lived in the sea millions of years ago
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What is cement made from?
Powdered limestone heated with powdered clay
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What is concrete made from?
Cement powder, water, sand and aggragate
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How do we use limestone to make buildings?
We cut and shape the blocks which we dig up from quarries, and stack them on top of each other
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What is the chemical formula for calcium carbonate?
CaCO3
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What is thermal decomposition?
Breaking down a chemical by heating
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What gas is produced when breaking down CaCO3?
Carbon dioxide
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What do we use a lime kiln for?
To make lots of calcium oxide (CaO) when breaking down calcium carbonate
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How do we use a lime kiln?
We fill the kiln with crushed limestone and heat it up with hot air, then calcium oxide comes out the bottom of the kiln. Waste gases such as carbon dioxide leave the kiln at the top.
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Why is a rotary kiln often used to produce calcium oxide?
This makes sure that the limestone is thoroughly mixed with the steam of hot air. This helps the calcium carbonate fully decompose
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What happens when a statue made of limestone is hit by acid rain? What also happens during this reaction?
It will suffer badly, because limestone is mostly calcium carbonate and that reacts with acid. A gas is given off
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How do you test for carbon dioxide?
Use limewater, if it turns cloudy then carbon dioxide is present
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What products are made when a carbonate reacts with an acid?
A salt, water and carbon dioxide
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What causes the cloudiness in the test for carbon dioxide using limewater?
A precipitate of insoluble calcium carbonate
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What is a precipitate?
An insoluble solid formed by a reaction taking place in a solution
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When metal carbonates decompose on heating, what do they form?
The metal oxide and carbon dioxide
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Other cards in this set
Card 2
Front
Where were some older forms of limestone formed?
Back
From the remains of tiny animals and plants that lived in the sea millions of years ago
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