Chemical energy ka3

what is enthalpy

measure of the chemical energy in a substance

Describe the term exothermic and say how it affects industry

Exothermic – releases heat energy to the surroundings. In industry it may require excess heat to be removed to prevent extreme temperature rises or dangerous conditions.

Describe the term endothermic and say how it affects industry

Endothermic – takes in heat energy from the surroundings. In industry there may be costs involved in supplying heat at the start of the reaction and also in maintaining the reaction rate.

enthalpy formula

Calculate enthalpy using the formula: Eh = cm∆T

Describe the term enthalpy of combustion

Enthalpy of combustion is the energy change when one mole of the substance burns completely in oxygen.

State the definition of molar bond enthalpy

the energy required to break one mole of bonds in a diatomic molecule.

State the definition of the term mean molar bond enthalpy

Mean molar bond enthalpy is the energy required to break one mole of bonds