EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记:2.3.4 Carbon Dioxide from Thermal Decomposition

EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记:2.3.4 Carbon Dioxide from Thermal Decomposition

Carbon Dioxide from 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

 

 

2.3.4-Thermal-Decomposition-of-Metal-Carbonates

 

The thermal decomposition of copper(II)carbonate

 

 

 

  • 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

 

 

Exam 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.

转载自savemyexams

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