Limestone Flashcards
What is the symbol for calcium carbonate (limestone)
CaCO3
What is made when calcium carbonate is thermally decomposed?
calcium oxide and carbon dioxide (CaO + CO2 / quicklime)
What is thermal decomposition?
When one substance chemically changes into two new substances when it’s heated.
Calcium carbonate reacts with acid to create a calcium salt, carbon dioxide and water. If calcium reacts with sulphuric acid what calcium salt is made?
Calcium sulphate.
Calcium oxide reacts with water to produce ….
Calcium hydroxide (slaked lime)
What is calcium hydroxide (slaked lime) used for?
To neutralise acidic soil
Explain how calcium hydroxide is used to test for carbon dioxide.
When you bubble carbon dioxide through a solution of carbon hydroxide and water, if the solution turns cloudy the gas has carbon dioxide in it. additional information The cloudiness is caused by the formation of calcium carbonate.
How is cement made?
Powdered limestone is heated in a kiln with powdered clay.
How is mortar made?
Cement mixed with sand and water.
How is concrete made?
Cement mixed with sand and aggregate.
State two pros and two cons of quarrying.
States two of the below: 1) Scars the landscape 2) Blasting rocks causes noise pollution 3) Causes traffic on nearby roads 4) Destroys habitats \+ Two of the below: 1) Limestone is an essential building material 2) Provides jobs on quarry 3) Limestone is used to neutralise acidic soil and... 4) sulphur dioxide
State two pros and two cons of concrete
States two of the below:
1) Widely available and cheap
2) Doesn’t rot, corrode and is fire-resistant
3) Can be poured into moulds to make blocks or panels
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States two of the below:
1) Unattractive
2) Fairly low tensile strength
3) Has to be reinforced by steel bars to be made stronger
