Example when alkali metals and water go together?

Answer 1

If you drop sodium metal into water, two reactions happen:

first 2Na + H2O -> 2NaOH + H2

then 2H2 + O2 -> 2H2O

The second reaction causes the huge explosion that makes this either an "exciting" experiment (if you drop the sodium into water from thirty or forty feet up) or a dangerous one (if you do it in the classroom).

Answer 2

When alkali metals such as sodium or potassium react with water, they form metal hydroxides and release hydrogen gas. This reaction is highly exothermic, often leading to the evolution of heat and formation of a strongly alkaline solution. The reaction between alkali metals and water is generally violent and can even result in the ignition or explosion of the hydrogen gas produced.