Thermal decomposition of ionic salts

Question 1

Metal hydroxide -> metal oxide + water
Ca(OH)2(s) -> CaO(s) + H2O(g) white solid -> white solid
Mg(OH)2(s) -> MgO(s) + H2O(g) white solid -> white solid

Answer 1

Metal nitrate -> metal nitrite + oxygen

2NaNO3(s) -> 2NaNO2(s) + O2(g) only for KNO3 and NaNO3

Question 2

Metal nitrate -> metal oxide + nitrogen dioxide + oxygen
2Ca(NO3)2(s) -> 2CaO(s) + 4NO2(g) + O2(g) all other nitrates decompose in this manner white solid -> white solid brown gas
2Pb (NO3)2(s) -> 2PbO(s) + 4NO2(g) + O2(g)
2Cu(NO3)2(s) -> 2CuO(s) + 4NO2(g) + O2(g) green solid -> black solid brown gas
Hg(NO3)2(s) -> Hg(l) + 2NO2(g) + O2(g) Hg is very low in the reactivity series

Answer 2

Metal carbonate -> metal oxide + carbon dioxide
Na2CO3(s) -> no reaction
CaCO3(s) -> CaO(s) + CO2(g) only goes at 1000°C
PbCO3(s) -> PbO(s) + CO2(g)
CuCO3(s) -> CuO(s) + CO2(g) goes around 500°C
green powder -> black solid
2HgO(s) -> 2Hg(l) + O2(g)