Question

when an __ reaction occurs the products have a greater enthalpy than the reactants, whereas during an __ reaction the enthalpy of the products is less than the enthalpy of the reactants.
o endothermic; exothermic
o exothermic; endothermic

Explanation:

• In an endothermic reaction, heat is absorbed. So, the products have a greater enthalpy (energy content) than the reactants as energy is taken in.
• In an exothermic reaction, heat is released. Thus, the products have a lower enthalpy than the reactants as energy is given out.

Answer:

A. endothermic; exothermic