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.

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.

The molecules contain like 54 of water