Enthalpy Changes 0.0 / 5 ? ChemistryEnthalpyASOCR Created by: amazingemilyjonesCreated on: 11-03-17 17:40 Exothermic reaction A reaction in which heat is released from the system (H of reactants is greater than H of products) 1 of 13 Endothermic reaction A reaction in which heat is gained by the system (H of products is greater than H of reactants) 2 of 13 Breaking chemical bonds and attractions is... Endothermic 3 of 13 Making chemical bonds and attractions is... Exothermic 4 of 13 Activation energy The minimum energy required by reactants in order to form products 5 of 13 Standard condition 100kPa pressure, 298K temperature, 1moldm-3 concentration 6 of 13 Enthalpy change of combustion The exothermic heat change which accompanies is the complete combustion of one mole of a substance 7 of 13 Enthalpy change of formation The heat change which accompanies the formation of one mole of a substance from its elements in their normal states 8 of 13 The value of enthalpy change of formation of any element Elements have an enthalpy change of formation of zero 9 of 13 Enthalpy change of neutralisation The exothermic heat change which accompanies the production of one mole of water when an acid reacts with an alkali or base 10 of 13 Why is experimental determination of an enthalpy change of combustion innacurate? Incomplete combustion, heat loss to surroundings 11 of 13 Average bond enthalpy The endothermic heat change to break one mole of covalent bonds in gaseous molecules averages over a range of molecules with that bond 12 of 13 Hess' law The total enthalpy change from reactants to products is the same independent of the route taken 13 of 13
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