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Write equations for the reactions of
(i) iron with steam
(ii) calcium and potassium with water
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(i) Iron react with steam to form the metal oxide and hydrogen. 

3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g) 

(ii) The reaction of calcium with water is exothermic but the heat evolved is not sufficient for the hydrogen to catch fire. 

Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g) 

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