Chemistry key terms some keys terms form unit 2 0.0 / 5 ? ChemistryASAQA Created by: william logueCreated on: 30-04-13 18:29 hess's law the enthalpy change for a chemical reaction is the same, whatever route is taken from reactants to products 1 of 5 enthalpy change the heat energy change at a constsnt pressure 2 of 5 enthalpy change of formation when 1 mole of a compound is formed from is elements under standard conditions, all reactants and products are in their standard states 3 of 5 enthalpy change of combustion when 1 mol of a substance in burned completly in oxygen under standard conditions, all reactants and products are in thier standard states 4 of 5 le chantilier's pricinple when any factor is applied to the equilibria, the equilibria will shift to oppose it 5 of 5
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