Heat of reaction

Heat of reaction is the amount of energy absorbed or released during a chemical reaction. It reflects whether the reaction is exothermic (releasing heat) or endothermic (absorbing heat). Think of it as the reaction's energy cost or gain, similar to how burning fuel releases heat, or baking bread requires energy. This energy change is measured in units like joules or calories and helps us understand the reaction’s energy balance. It is an important concept in chemistry because it influences conditions needed for the reaction to happen and its impact on the surroundings.