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What happens when
(i) Calcium carbonate is heated ?
(ii) Silver bromide is exposed to sunlight ?
(iii) Lead is added to copper (II) chloride solution ?
Write balanced chemical equations of the reactions involved in support of your answer.
(i) Calcium carbonate is heated ?
(ii) Silver bromide is exposed to sunlight ?
(iii) Lead is added to copper (II) chloride solution ?
Write balanced chemical equations of the reactions involved in support of your answer.
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(i) Calcium carbonate decomposes to calcium oxide and carbon dioxide. (½ Mark)
$\ce{CaCO3(s) ->[Heat] CaO(s) + CO2(g)}$ (½ Mark)
(ii) Silver bromide decomposes to silver and bromine by light. (½ Mark)
$\ce{2AgBr(s) ->[Sunlight] 2Ag(s) + Br2(g)}$ (½ Mark)
(iii) Lead displaces copper from copper chloride solution. (½ Mark)
$\ce{Pb(s) + CuCl2(aq) -> PbCl2(aq) + Cu(s)}$ (½ Mark)
(Note: Award full marks if balanced chemical equation is written)
$\ce{CaCO3(s) ->[Heat] CaO(s) + CO2(g)}$ (½ Mark)
(ii) Silver bromide decomposes to silver and bromine by light. (½ Mark)
$\ce{2AgBr(s) ->[Sunlight] 2Ag(s) + Br2(g)}$ (½ Mark)
(iii) Lead displaces copper from copper chloride solution. (½ Mark)
$\ce{Pb(s) + CuCl2(aq) -> PbCl2(aq) + Cu(s)}$ (½ Mark)
(Note: Award full marks if balanced chemical equation is written)