Carbon Dioxide from Thermal Decomposition
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13 Terms
Thermal decomposition
Breaking down a compound using heat
Metal carbonates
Many decompose when heated
General reaction
Metal carbonate → metal oxide + carbon dioxide
Example copper carbonate
CuCO₃ → CuO + CO₂
Copper carbonate observation
Green powder turns black (CuO)
Test for CO₂
Turns limewater milky
Reason limewater turns milky
Formation of calcium carbonate
Group 1 carbonates
Do not decompose easily (except lithium)
Lithium carbonate
Decomposes to Li₂O + CO₂
Group 2 carbonates
Decompose more readily than Group 1
Thermal stability trend
Increases down the group
Reason for stability trend
Larger cations polarise carbonate ion less
Use of decomposition
Producing metal oxides and CO₂ in lab
