With this questions and plz explain

1) The answer is: a) absorbed 20 kJ.

potential energy = bond energy of the product - bond energy of the reactants.

ΔE = 60 kJ - 40 kJ.

ΔE = 20 kJ; potential energy.

2) The answer is: endothermic.

This is endothermic reaction (ΔE > 0, chemical reaction that absorbs more energy than it releases).

In endothermic reactions heat is reactant.

3) The answer is: decrease.

In a calorimeter with endothermic reaction, the heat required by the reaction is removed from the water and the temperature of the water decreases.