When an electric current is passed through liquid calcium chloride, the liquid breaks down to form calcium and chlorine. This reaction stops happening when the electricity supply is turned off. Is this an exothermic chemical reaction or an endothermic chemical reaction? Explain your answer.
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Electrolysis of water is a decomposition reaction ; a single reactant breaks down into more than one product. The breaking down of H 2 O into H 2 and O 2 by passing electricity is known as electrolysis of water.
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