In a TD reaction, a chemical breaks down into more than 1 substance when heated.
- Calcium carbonate decomposes into calcium oxide and carbon dioxide.
- Is used for making glass, cement and limewater.
Equation is: metal carbonate -> metal oxide + carbon dioxide
- The reaction between calcium oxide and water produces calcium hydroxide/slaked lime.
Calcium oxide + water -> calcium hydroxide
CaO (s) + H2O(l) -> Ca(OH2) (s)
- Limewater is calcium hydroxide solution. When limewater reacts with carbon dioxide, a cloudy precipitate of calcium carbonate forms, as it's insoluble.
Calcium hydroxide + carbon dioxide -> calcium carbonate
Ca(OH)2 (aq) + CO2 (g) -> CaCO (s)
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