Question

# Write equations for each of the above metal which reacts with water.

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Solution

## Being highly reactive, sodium is placed at the top of the reactivity series. It reacts violently with cold water forming sodium hydroxide and hydrogen gas; it may explode with hot water. $2\mathrm{Na}+2{\mathrm{H}}_{2}\mathrm{O}\to 2\mathrm{NaOH}+{\mathrm{H}}_{2}\phantom{\rule{0ex}{0ex}}\mathrm{Sodium}\mathrm{water}\mathrm{Sodium}\mathrm{Hydrogen}\mathrm{gas}\phantom{\rule{0ex}{0ex}}\mathrm{hydroxide}$ Calcium does not react violently with water and forms calcium hydroxide and hydrogen gas. $\mathrm{Ca}+2{\mathrm{H}}_{2}\mathrm{O}\stackrel{}{\to }\mathrm{Ca}\left(\mathrm{OH}{\right)}_{2}+{\mathrm{H}}_{2}\phantom{\rule{0ex}{0ex}}\mathrm{Calcium}\mathrm{water}\mathrm{Calcium}\mathrm{hydroxide}\mathrm{Hydrogen}\mathrm{gas}$ Magnesium reacts very slowly with cold water but red hot magnesium reacts with steam to form magnesium oxide and hydrogen gas. $\mathrm{Mg}+{\mathrm{H}}_{2}\mathrm{O}\stackrel{}{\to }\mathrm{MgO}+{\mathrm{H}}_{2}\phantom{\rule{0ex}{0ex}}\mathrm{Magnesium}\mathrm{Steam}\mathrm{Magnesium}\mathrm{oxide}\mathrm{Hydrogen}\mathrm{gas}$ Iron does not react with cold water but red hot iron reacts with steam to form tri-iron tetroxide and hydrogen. This is a reversible reaction. $3\mathrm{Fe}+4{\mathrm{H}}_{2}\mathrm{O}↔{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}+4{\mathrm{H}}_{2}\phantom{\rule{0ex}{0ex}}\mathrm{Red}\mathrm{hot}\mathrm{Iron}\mathrm{Steam}\mathrm{Tri}\mathrm{i}\mathrm{ron}\mathrm{tetroxide}\mathrm{H}\mathrm{ydrogen}\mathrm{g}\mathrm{as}\phantom{\rule{0ex}{0ex}}$

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