Many reactions ______ electrical energy., give off, make up, give rise to, When an acid is placed in contact with certain metals, hydrogen is ______., made up, given off, given rise to, Iron ______ about 4 per cent of the solid rocks of the earth's crust., makes up, off, gives rise, When treated with dilute acids, sodium hypochlorite ______ chlorine., makes up, gives off, gives rise to, The molecule of hydrogen is ______ by the union of two hydrogen atoms., given off, given rise to, made up, A certain amount of mercury dissolves in sulphuric acid ______ mercurous sulphate., making up, giving rise to, giving off

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