Chemistry - Topic 8 Energetics 1 0.0 / 5 ? ChemistryEnergeticsA2/A-levelEdexcel Created by: _kate_maeCreated on: 05-01-23 19:33 The heat energy change in a reaction at a constant pressure Enthalpy change 1 of 13 Gives out heat (system temp decreases) Exothermic 2 of 13 Takes in heat (system temp increases) Endothermic 3 of 13 Higher enthalpy means … stable Less 4 of 13 298K, 100kPa etc Standard conditions 5 of 13 The enthalpy change when the reaction occurs in the molar quantities shown in the chemical equation under standard conditions Reaction 6 of 13 Enthalpy change when one mole of a compound is formed from its elements in their standard states, under std conditions Formation 7 of 13 Enthalpy change when one mole of substance is completely burnt in oxygen Combustion 8 of 13 Enthalpy change when an acid and alkali and acid react, under std conditions, to form 1mole water Neutralisation 9 of 13 The total enthalpy change is always the same, no matter the route taken Hess’ Law 10 of 13 Energy is needed to break bonds Endothermic 11 of 13 Energy is released when bonds form Exothermic 12 of 13 Amount of energy required to break 1 mole of a type of bond in a gaseous molecule Bond enthalpy 13 of 13
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