and having a valency
4. Name two elements that have variable valency. Give the formulae and names of two compour
formed by each of these elements.
5. What is a balanced chemical equation? Why chould
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4. For example, copper, tin, iron and mercury exhibit variable valency. Copper combines with oxygen to form cuprous oxide (Cu2O) and cupric oxide (CuO). Valency of oxygen being two, combining capacity of copper in the first case is one and that in the second case is two.
5. chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side.
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