Write equations for the reactions of Calcium and Potassium with water.

Reaction of Calcium with water:

• When a metal reacts with water (cold water or hot water), metal Hydroxide and Hydrogen gas are formed.

$\mathrm{Metal}+\mathrm{Water}\left(\mathrm{Steam}\right)\to \mathrm{Metal}\mathrm{hydroxide}+\mathrm{Hydrogen}$

• Calcium hydroxide and Hydrogen gas are formed when Calcium reacts with cold water.
  $$\begin{gathered} \mathrm{Ca}\left(\mathrm{s}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to \mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{aq}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right) \\ \mathrm{Calcium}\mathrm{Water}\mathrm{Calcium}\mathrm{Hydrogen} \\ \mathrm{hydroxide} \end{gathered}$$

Reaction of Potassium with water:

• Potassium hydroxide and Hydrogen gas are formed when Potassium reacts violently with cold water.
• During the process, so much heat is generated that the Hydrogen gas produced catches fire and burns quickly.
  $$\begin{gathered} 2\mathrm{K}\left(\mathrm{s}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to 2\mathrm{KOH}\left(\mathrm{aq}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)+\mathrm{Heat} \\ \mathrm{Potassium}\mathrm{Potassium}\mathrm{Hyrdogen} \\ \mathrm{hydroxide} \end{gathered}$$