CHEMICALS IN ACTION Thermal Decomposition Reactions.
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CHEMICALS IN ACTION
Thermal Decomposition Reactions
Learning objectives
To know what is meant by a “thermal decomposition”
To recognise what happens during the thermal decomposition of limestone
Understand the thermal decomposition of limestone.
Know how limestone is made
Thermal Decomposition Reactions
A thermal decomposition occurs when a compound undergoes a reaction when it is heated.No other substance is involved in the reaction.
Thermal decomposition of copper carbonate
If heated copper carbonate will undergo a thermal decomposition.
Thermal decomposition of copper carbonate
The copper carbonate reacts when heated with no additional chemicals involved.
CuCO3(s) heat
CuO(s) + CO2(g)
Limestone
Chemistry text p46
Uses of limestone
Thermal decomposition of limestone
Carry out the practical outlined on the worksheet.
If you do not heat the limestone long enough you will not get any of the expected results
Reactions you need to know by heart!
Thermal decomposition of limestone (calcium carbonate)
calcium carbonate calcium oxide + carbon dioxide
CaCO3(s) CaO(s) + CO2(g)
Calcium oxide + water calcium hydroxide
CaO(s) + H2O(l) Ca(OH)2(aq)
Calcium hydroxide + carbon dioxide
calcium carbonate + water
Ca(OH)2(aq) + CO2(g) CaCO3(s) + H2O(l)
Information on limestone and its products
Read p48 of the Chemistry text.
Make a set of bullet points on “The manufacture of calcium hydroxide – slaked lime”.
Learning objectives
To know what is meant by a “thermal decomposition”
To recognise what happens during the thermal decomposition of limestone
Understand the thermal decomposition of limestone.
Know how limestone is made
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