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17 Cards in this Set
- Front
- Back
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What is the formula for limestone?
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CaCO3
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What is produced when limestone is heated strongly?
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CaCO3 ---> CaO + CO2.
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What are the chemical and everyday names of CaO and Ca(OH)2(s) and Ca(OH)2(aq)?
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CaO = calcium oxide (quicklime) Ca(OH)2 (s) = calcium hydroxide (slaked lime) Ca(OH)2 (aq) = aqueous calcium hydroxide (limewater) |
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What type of reaction is CaCO3 ---> CaO + CO2?
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Thermal decomposition (heat is used to break down a compound)
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What is limestone used for?
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Building material, statues, abrasive in toothpaste, cement, and mortar and concrete.
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Limestone is thermally decomposed inside a rotatory kiln. Explain why large amounts of CO2 are produced in this process.
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Thermal decomposition of limestone releases CO2. The fuel that is combusted to produce the high heat required (methane), releases CO2.
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How do you test for carbon dioxide?
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Bubble the gas through limewater. If carbon dioxide is present, the limewater will turn cloudy (calcium carbonate formed)
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What is produced when metal carbonates such as calcium carbonate react with acids?
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Salt + water + carbon dioxide |
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Write equations for the limestone cycle
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CaCO3(s) ---> CaO(s) + CO2(g)
CaO(s) + H2O(l) ---> Ca(OH)2(s) Ca(OH)2(s) + more water ---> Ca(OH)2(aq) Ca(OH)2(aq) + CO2(g) ---> CaCO3(s) +H2O(l) |
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Buildings made from limestone are affected by burning fossil fuels containing sulfur Explain why.
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The sulphur reacts with oxygen when the fuel is burnt.This produces sulphur dioxide which dissolves in rain water producing acid rain which reacts with limestone.
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How do you produce mortar?
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By mixing cement with water and sand.
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What are the disadvantages of mortar and cement?
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Large amounts of CO2 are produced when making cement and mortar.
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How do you make cement?
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Heat limestone with clay in a kiln.
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How do you make concrete?
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Add water, cement, sand and small stones or crushed rock.
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Give reasons for using concrete rather than limestone as a building material.
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Can be poured into shapes, weather and corrosion resistant, stronger.
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Give reasons against building with concrete.
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Ugly; production releases carbon dioxide which adds to the greenhouse effect.
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Give reasons for mining limestone.
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Many uses, especially as a building material; mining provides jobs, workers will move to local area improving the local economy.
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