Carbon Dioxide from Thermal Decomposition (Edexcel IGCSE Chemistry (Modular))

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Thermal decomposition

What is thermal decomposition?

  • Thermal decomposition is the term used to describe reactions where a substance breaks down due to the action of heat

  • One such reaction is the thermal decomposition of metal carbonates

  • Carbonates of metals from the lower half of the reactivity series tend to decompose on heating to produce the metal oxide and carbon dioxide gas:

metal carbonate → metal oxide + carbon dioxide

Thermal decomposition of copper(II) carbonate

Thermal Decomposition of Metal Carbonates, downloadable IGCSE & GCSE Chemistry revision notes

The thermal decomposition of copper(II)carbonate produces copper(II) oxide and carbon dioxide

  • The thermal decomposition of copper(II)carbonate occurs readily on heating

  • Copper(II) carbonate is a green powder and slowly darkens as black copper(II) oxide is produced

  • The carbon dioxide given off can be tested by passing the gas through limewater and looking for it to turn milky

  • The equation for the reaction is

CuCO3 (s) →  CuO (s)+ CO2  (g) 

copper(II) carbonate → copper(II) oxide + carbon dioxide

Examiner Tip

The release of carbon dioxide from calcium carbonate in the production of cement is a contributing source of rising atmospheric CO2 levels that contributes to the enhanced greenhouse effect.

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