What is endothermic vs exothermic reactions?
Please not that:
Enthalpy of a reaction is defined as the heat energy change (ΔH) that takes place when reactants go to products.
If heat is absorbed during the reaction, ΔH is positive (endothermic)
if heat is released, then ΔH is negative (exothermic)
But if you mean the (Endothermic vs Exothermic) reactions it is either;
The Difference between them or Similarities between them
Rather they might also want you to compare between their two..