SSC MTS EXAM

Detailed explanation-1: -Thermochemistry is the study of chemical reactions and the energy changes that involve heat.

Detailed explanation-2: -heat of reaction, also called enthalpy of reaction, the amount of heat that must be added or removed during a chemical reaction in order to keep all of the substances present at the same temperature.

Detailed explanation-3: -Thermochemistry: Study of the heat released or absorbed by chemical reactions. Rearrangements of atoms that occur during chemical reactions involve both bond breaking and bond formation. Bond breaking results in absorption of heat from the surroundings and bond formation in release of heat to the surroundings.