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

When quicklime (calcium oxide) is added to water filled in a bucket, it reacts with water chemically to form slaked lime (calcium hydroxide) and produce heat energy. So, water in the bucket becomes hot as it is an exothermic reaction.

    $\ CaO\ ( s) +H_{2} O\ ( l)\rightarrow Ca( OH)_{2\ }( aq) \ +Heat$

   Calcium oxide + Water →  Calcium hydroxide + Heat