Question

When the products of a reaction have a higher enthalpy than the reactants _____. Select all that apply. The reaction is exothermic. The reaction is endothermic. The reactants lost internal energy. The change in enthalpy is positive.

Answer 1

The heat added or lost by the system during the reaction is called enthalpy.

The process is when a chemical reaction occurs in which the system produces heat .The system has a lower enthalpy at the end of the reaction
The process is endothermic when a chemical reaction occurs in which the system absorbs heat. The system has higher enthalpy at the end of the reaction.
So, when the products of a reaction have a higher enthalpy than the reactants the reaction is exothermic and the change in enthaply is positive.