Calcium Carbonate

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Calcium Carbonate

Limestone mainly calcium carbonate

Breaks into calcium oxide and carbon dioxide when heated

Calcium oxide reacts with water producing calcium hydroxide

Limestone used to make cement, mortar and concrete

Breakdown of calcium carbonate called thermal decomposition

Sodium, magnesium, copper carbonate all decompose in the same way as calcium

Metals high in reactivity series need more energy to decompose

Metals low in reactivity series are more easy to decompose

Copper carbonate often used to shown thermal decompostion for this reason

Green cpper carbonate changes to black copper oxide --> easy to see

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Products from CaCO3

When strongly heated calcium carbonate breaks down to form calcium oxide and CO2

Calcium oxide is yellow when hot, white when cold

Calcium carbonate --> calcium oxide + carbon dioxide

Thermal decomposition reaction

Calcium oxide reacts with water to form calcium hydroxide

Calcium hydroxide is an alkali

Calcium oxide + water --> calcium hydroxide

Heat produced in reaction - can cause water to boil

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Uses of limestone

Limestone is type of rock which is quarried & used for building (cement, mortar, concrete)

Carbomates produce CO2, salt and water when react with acid

eg. calcium carbonate + HCL --> CO2 + calcium chloride + water

Limestone is damaged by acid rain

Sodium, magnesium, zinc and copper carbonate fizz when with acids

Calcium hydroxide used to neutralise excess acidity eg in soils affected by acid rain

Cement made by heating powdered limestone with clay

Mortar (for joining bricks) - mixing cement with sand and water

Condrete - mixing cement with sand, water and aggregate (crushed rock)

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Advantages & disadvantages of various building materials

Limestone/cement/mortar wear away when react with CO2 dissolved in rain

Cause gaps inbetween bricks that have to be filled

Pollution from burning fossil fuels makes rain more acidic (making above worse)

Concrete easily formed before it sets and strong when squashed 

Weak when bent or stretched and considered unattractive on bridges/buildings

Concrete can be made stronger when reinforced with steel

Effects of the limestone industry

Valuable natural resource used to make glass&concrete, provides employment supporting economy in local area

Visible from far disfiguring local environment, creates noise and heavy traffic

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