4. exothermic reactions - always release energy never have reverse reactions do not require any activation…

4. exothermic reactions - always release energy never have reverse reactions do not require any activation energy sometimes have a positive change in enthalpy clear all

4. exothermic reactions - always release energy never have reverse reactions do not require any activation energy sometimes have a positive change in enthalpy clear all

Answer

Brief Explanations:

Exothermic reactions are defined as reactions that release energy in the form of heat or light. They have a negative change in enthalpy. All exothermic reactions require some activation energy to start. And they can have reverse reactions (endothermic reactions).

Answer:

always release energy