That means the enthalpy changing routeChestermiller said:
Enthalpy change is the difference in energy between the reactants and the products in a chemical reaction. It is also known as heat of reaction.
Enthalpy change is measured in units of joules (J) or kilojoules (kJ). It can be measured using a calorimeter, which is a device that measures the temperature change of a reaction.
The factors that affect enthalpy change include the type of reaction, the temperature, the concentration of reactants, and the pressure. The physical state of the reactants and products can also have an impact.
Enthalpy change is related to bond energies because breaking and forming chemical bonds requires energy. When bonds are broken, energy is absorbed, resulting in a positive enthalpy change. When bonds are formed, energy is released, resulting in a negative enthalpy change.
Yes, enthalpy change can be negative. A negative enthalpy change indicates that energy is released during the reaction, resulting in a decrease in enthalpy. This often occurs in exothermic reactions, where heat is given off.