Thermochemistry definitions 0.0 / 5 ? ChemistryEnthalpyASWJEC Created by: Tasha.LCreated on: 13-04-16 17:18 Standard enthalpy change of formation. The enthalpy change when one mole of a compound is formed from its elements under standard conditions. 1 of 9 The principle of conservation energy. This states that energy cannot be created or destroyed, only changed from one state to another. 2 of 9 Bond enthalpy. The enthalpy change required to break a covalent bond with all its species in the gaseous state. 3 of 9 Hess's Law This states that the enthalpy change of a reaction is always the same, whatever route is taken from reactants to products. 4 of 9 Standard enthalpy change of combustion. This is the enthalpy change when one mole of a compound is burned completely in oxygen under standard conditions. 5 of 9 Standard conditions. a). All substances in their standard states. b). Pressure of 100kPa. c). Temperature of 298K. 6 of 9 Elastic potential energy. A type of energy within a system, caused by the position of atoms relative to one another. 7 of 9 Enthalpy change. The heat change of a reaction at constant pressure. 8 of 9 Enthalpy The total energy content of a system at constant pressure. 9 of 9
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