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The limestone cycle PowerPoint PPT Presentation


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The limestone cycle. Limestone. Learning Objectives. By the end of the lesson I will be able to: Carry out thermal decomposition of calcium carbonate Draw a flow diagram of the limestone cycle Write balanced chemical equations for reactions in the limestone cycle . Heating limestone.

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The limestone cycle

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The limestone cycle

Limestone


Learning Objectives

By the end of the lesson I will be able to:

  • Carry out thermal decomposition of calcium carbonate

  • Draw a flow diagram of the limestone cycle

  • Write balanced chemical equations for reactions in the limestone cycle


Heating limestone

  • When limestone (calcium carbonate) is heated, it breaks down (decomposes)

  • When something breaks down with heat we call this reaction…

    Thermal decomposition

  • Calcium carbonate breaks down into calcium oxide (quicklime) and carbon dioxide


Thermal decomposition of limestone

Calcium heat calcium carbon

Carbonateoxide dioxide

CaCO3heatCaO CO2


Reacting quicklime with water

  • Calcium oxide (quicklime) is a strong alkali

  • It reacts with water to form calcium hydroxide Ca(OH)2

  • Calcium hydroxide is also known as slaked lime


Making cement, mortar and concrete.

Decomposing rotting bodies in mass graves and reducing the smell !

Uses for quicklime


Making Slaked Lime

calcium + water calcium

oxide hydroxide

CaO + H2O Ca(OH)2


To neutralise acidic soils, and to break up the soil so that plants can grow well

To neutralise lakes which have been polluted by acid rain

Uses for slaked lime


Limewater

  • Limewater is a solution of calcium hydroxide

  • It is used to test for carbon dioxide

  • We breathe out a lot of carbon dioxide

  • If we blow through a straw into limewater it will change from clear to milky-white

  • The substance formed in this reaction is insoluble calcium carbonate


Testing for carbon dioxide

calcium + carbon calcium + water

hydroxide dioxide carbonate

Ca(OH)2 + CO2 CaCO3 + H2O


The Limestone Cycle

These reactions all make up the

limestone cycle.


Task:

Use the worksheet called ‘The Limestone

Cycle’

- fill in the gaps and complete the

equations for the reactions of limestone.

Stick into your books.


The Limestone Cycle

limestone

carbon

dioxide

heat

quicklime

limewater

more

water

water

Slaked lime


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