Question

What will be the reaction when Sodium metal is dropped into water?

Answer 1

Exothermic reaction:

• "The reaction in which heat energy is evolved is called an exothermic reaction."
• This reaction produces a heating effect.

Reaction when Sodium is dropped into water:

• The reaction of Sodium ($\mathrm{Na}$) with water $\left({\mathrm{H}}_2\mathrm{O}\right)$ is a violent reaction in which Sodium hydroxide ($\mathrm{NaOH}$) and Hydrogen (${\mathrm{H}}_2$) are formed.
• It is an exothermic reaction.
• The reaction is as follows:

$\underset{\left(\mathrm{Sodium}\right)}{2\mathrm{Na}\left(\mathrm{s}\right)}+\underset{\left(\mathrm{Water}\right)}{2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\left(\mathrm{Sodium}\mathrm{hydroxide}\right)}{2\mathrm{NaOH}\left(\mathrm{l}\right)}+\underset{\left(\mathrm{Hydrogen}\mathrm{gas}\right)}{{\mathrm{H}}_2\left(\mathrm{g}\right)}$