thermal decomposition

• thermal decomposition = breaking down of compound by heating
• thermal decomposition reaction = heat breaks down a substance into something new -> endothermic (heat taken in )
• metal carbonate -> metal oxide + carbon dioxide
• using the apparatus , to identify reaction bubbles of carbon dioxide will be seen and the limewater will turn milky
• test for dioxide gas = bubble through limewater and limewater will turn milky
• copper ( II ) carbonate thermally decomposes into copper ( II ) oxide
• copper ( II ) carbonate = green solid
• copper ( II ) oxide = black solid
• copper ( II ) carbonate -> copper ( II ) oxide + carbon dioxide
• calcium carbonate has to be more strongly heated than copper ( II ) carbonate for thermal decomposition to occur -> more reactive than copper
• sodium carbonate will not decompose when heated
• the more reactive the metal , the more stable the carbonate -> harder to decompose
• carbon dioxide will not be produced if it doesn't decompose
• melting = change of state
• thermal decomposition = break apart to create something new
• following carbonates DO NOT thermally decompose :

  • sodium
  • potassium
  • rubidium
  • caesium