Question

What happens chemically when quicklime is added to water filled in a bucket?

Answer 1

When quicklime (calcium oxide) is added to water in a bucket, they react chemically to form slaked lime (calcium hydroxide) and produces heat energy. So, the water in the bucket becomes hot.

\[\ce{\underset{Calcium oxide}{CaO_{(s)}} + \underset{Water}{H2O_{(l)}} -> \underset{Calcium hydroxide}{Ca(OH)2_{(aq)}} + Heat}\]