Question

What happens when energy is removed from a liquid

Answer 1

As energy is removed, the temperature of the liquid decreases.  

If you keep removing even more energy from the liquid, then eventually its temperature reaches the melting/freezing temperature, and the liquid begins to undergo a change of state, and it changes to the solid form.

Answer 2

A liquid becomes a solid when heat is removed. The energy content decreases, and the speed of the particles decrease.

When bonds form, heat energy is given off. This reaction is an exothermic reaction.