GCSE 1.2 – Limestone Cycle Limestone Cycle!!!.

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Presentation transcript:

GCSE 1.2 – Limestone Cycle Limestone Cycle!!!

Aims Limestone is mostly made of calcium carbonate CaCO3 can decompose under heat to form calcium oxide and carbon dioxide Calcium oxide can react with water to form calcium hydroxide Calcium hydroxide can react with carbon dioxide to give calcium carbonate The above reaction can be used as a test for CO2

What is Limestone? Limestone is a sedimentary rock – built up over millions of years. Cut into blocks it makes a pretty solid building material.

We are going to investigate some of the chemical reactions of limestone… H2O Add water Thermal decomposition – ‘limelight’ Filter… Blow through solution

CaCO3  CaO + CO2 CaO + H2O  Ca(OH)2 Ca(OH)2 + CO2  CaCO3 + H2O calcium carbonate calcium oxide CaO + H2O  Ca(OH)2 calcium oxide calcium hydroxide Ca(OH)2 + CO2  CaCO3 + H2O calcium hydroxide calcium carbonate Are these equations balanced?

A reaction in which a compound is broken down using heat Term Definition Limestone A sedimentary rock mostly composed of calcium carbonate which can be used as a building material Thermal decomposition A reaction in which a compound is broken down using heat Alkali A substance which neutralises acids and is water soluble (as opposed to a base which is not water soluble but can neutralise acids) Limewater A solution of calcium hydroxide used to test for carbon dioxide, if the gas is present the limewater will turn cloudy when the gas is bubbled through it