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GCSE Chemistry 1.2 Rocks and Building Materials > End Of Unit Questions > Flashcards

Flashcards in End Of Unit Questions Deck (8)
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1

Name the 4 substances used to create concrete

•sand
•water
•aggregate
•cement

2

Name the products formed when calcium carbonate is heated strongly

•calcium oxide
•carbon dioxide

3

Write a word equation for the reaction of calcium oxide with water

Calcium oxide + water --> calcium hydroxide

4

Limewater goes cloudy when mixed with carbon dioxide, explain why using an equation in your answer

Calcium carbonate is formed and is insoluble

Calcium hydroxide + carbon dioxide --> calcium carbonate + water

5

Explain as fully as you can why acids damage limestone

Acids react with calcium carbonate producing carbon dioxide and a salt, the salt dissolves in water so the amount of limestone decreases

6

Farmers spread calcium hydroxide on fields with acidic soils, explain why, naming the type of reaction that takes place and the property of calcium hydroxide on which this reaction takes place

Calcium hydroxide reacts with acids because it is an alkali so the reaction is neutralisation

7

Balance this symbol equation:
K2CO3 + HCl --> KCl + H2O + CO2

K2CO3 + 2HCl --> 2KCl + H2O + CO2

8

How is cement made?

Mix limestone and clay in a lime kiln at very hot temps and then grind into a powder