Give balanced equations for the following conversions affected by heat alone on the substances:

(a) Copper carbonate to copper oxide

(b) Hydrated copper sulphate to sulphur dioxide

(c) Copper nitrate to nitrogen dioxide

(d) Ammonium dichromate to nitrogen

(e) Zinc carbonate to zinc oxide

(f) Zinc nitrate to nitrogen dioxide

(a) Copper carbonate to copper oxide

$\underset{\text{[Copper carbonate (light green)]}}{\text{CuCO}$3} \overset{\Delta}{\longrightarrow} \underset{\text{[copper oxide - black]}}{\text{CuO}} + \underset{\text{[Carbon dioxide]}}{\text{CO}2} [\text{g}]

(b) Hydrated copper sulphate to sulphur dioxide

$\underset{\text{[Copper sulphate (hydrous - blue)]}}{\text{CuSO}$4.5\text{H}2\text{O}}\longrightarrow \underset{\text{ [Copper sulphate (anhydrous - white)]}}{\text{CuSO}4} + \underset{\text{ [water vapour]}}{5\text{H}2\text{O}}

On strong heating

$2\text{CuSO}$4 \longrightarrow \underset{\text{[ Copper oxide - black] }}{2\text{CuO}} + \underset{\text{[Sulphur dioxide]}}{2{\text{SO}2}} + \underset{\text{ [oxygen]}}{\text{O}_2}

(c) Copper nitrate to nitrogen dioxide

$\underset{\text{[Copper nitrate (blue)]}}{2\text{Cu(NO}$3)2} \overset{\Delta}{\longrightarrow} \underset{\text{[copper oxide - black]}}{2\text{CuO}} + \underset{\text{[Nitrogen dioxide]}}{4\text{NO}2} + \underset{\text{[Oxygen]}}{\text{O}2}

(d) Ammonium dichromate to nitrogen

$\underset{\text{[Ammonium dichromate (orange)]}}{(\text{NH}$4)2\text{Cr}2\text{O}7} \longrightarrow \underset{\text{ [Chromic oxide(green)]}}{\text{Cr}2\text{O}3} + \text{H}2\text{O} + \text{N}2

(e) Zinc carbonate to zinc oxide

$\begin{matrix} \text{ZnCO}$3 &\xrightarrow\Delta & \text{ZnO} & + & \text{CO}2 \ \text{[Zinc} & & \text{[Zinc oxide]} & & \text{[Carbon} \ \text{carbonate]} & & \text{[yellow - hot]} & & \text{dioxide]} \ \text{[white]} & & \text{[white - cold]} \end{matrix}

(f) Zinc nitrate to nitrogen dioxide

$\underset{\text{[zinc nitrate (white)]}}{2\text{Zn(NO}$3)2} \overset{\Delta}{\longrightarrow} \underset{\text{[yellow - hot, white - cold]}}{2\text{ZnO}} + \underset{\text{[Nitrogen dioxide]}}{4\text{NO}2} + \underset{\text{[Oxygen]}}{\text{O}2}