A reaction is endothermic if the
-
reaction vessel feels cool during the reaction
- enthalpy change is negative
- bond forming energy exceeds bond breaking energy
- heat of formation of reactants exceeds heat of formation of products
The correct answer is: A
Explanation
Endothermic reactions absorb heat from their surroundings during the reaction process. This means that in the course of the reaction the vessel being used in the reaction will be cool in the process.