Final answer:
Delta H (ΔH) in chemistry refers to the enthalpy change of a chemical reaction, representing the energy difference between the bond energies of reactants and products. It is a key concept for understanding whether a reaction absorbs or releases heat.
Step-by-step explanation:
Understanding Delta H (ΔH) in Chemistry
In chemistry, the term bof a reaction, indicating whether a reaction is endothermic (absorbing heat) or exothermic (releasing heat). The bond energies used in these calculations usually come from established data tables and are given in kilojoules per mole (kJ/mol). The Hess's law is also an important principle which states that the total enthalpy change for a reaction is the same regardless of the number of steps the reaction is carried out in, which allows for complex enthalpy calculations involving multiple steps.