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Alkali metals/energy

username2207531

I'm doing some Chemistry questions on entropy and energy. One question asks to state the observed trend in reactivity of alkali metals. The next part says, "When caesium reacts with water, the heat energy released (deltaH) is less that that for lithium reacting with water. State how this fact related, if at all, to the observed difference in reactivity...."

I'm a little confused since lithium barely moves around in water, whereas schools can't even go past potassium because it's too reactive and makes fire, and ceasium just causes a full on explosion. Surely ceasium and water would release a lot more heat energy.