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22 Cards in this Set
- Front
- Back
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What type of rock is limestone? |
Sedimentary |
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When and how did it form? |
over millions of years, animals and plants died and sank to the bottom of the sea. these deposits were covered in other marine deposits. it was then compressed to form limestone. |
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How do we get limestone? |
Dig out of the ground by quarries |
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What are blocks of limestone used for? |
Building houses
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What is crushed limestone used for? |
to build roads |
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What is mixed with limestone to make cement? |
Clay |
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What is mixed with limestone to make glass? |
Sand and sodium carbonate |
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How is mortar made?
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By mixing cement powder with water and sand.
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What is mortar used for? |
Used to join bricks together. |
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How is concrete formed? |
Cement is mixed with water, sand and crushed rock |
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What is concrete used for? |
Used in many ways in buildings |
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What is the formula for limestone? |
CaCO3 |
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How is limestone changed into quicklime? What gas is produced? |
is heated in a lime kiln producing carbon dioxide |
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What type of reaction is heating limestone to form calcium oxide and carbon dioxide? |
thermal decomposition |
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What would you see as limestone is heated? |
Would glow brightly with a white light |
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What is the chemical name for quicklime? What is its formula? |
Calcium oxide CaO |
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What happens when fresh quicklime reacts with water? |
a lot of heat is given off forms slaked lime |
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Slaked lime is not very soluble but a little bit can be dissolved in water to make... |
Limewater |
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What is the formula for limewater? What is it otherwise known as? |
Ca(OH)2 Calcium hydroxide |
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Why does limewater go cloudy when carbon dioxide is bubbled through it? |
Because the carbon dioxide reacts with the calcium hydroxide to form the insoluble substance, calcium carbonate |
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Calcium hydroxide + carbon dioxide > |
calcium carbonate + water |
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Give two examples as to how calcium oxide is used in everyday life. |
1. in water and sewage treatment to reduce acidity 2. In agriculture to improve acidic soils by making them more alkaline 3. In the extraction of iron, to help remove impurities from iron ore in the blast furnace |
