SSC MTS EXAM

Detailed explanation-1: -Exothermic reactions are chemical reactions that produce heat. In Section II-B of Chapter 3, we defined the heat flow q as negative when heat flows from the system to the surroundings. Thus, exothermic reactions have a negative H of reaction.

Detailed explanation-2: -Where is the exothermic heat energy coming from? The heat comes from the energy stored in the chemical bonds of the reactant molecules–which is greater than the energy stored in the chemical bonds of product molecules.

Detailed explanation-3: -An exothermic process is one that gives off heat. This heat is transferred to the surroundings. An endothermic process is one in which heat has to be supplied to the system from the surroundings. A thermoneutral process is one that neither requires heat from the surroundings nor gives off energy to the surroundings.