Topic 8- Energetics I 0.0 / 5 ? ChemistryEnergeticsEnthalpyASEdexcel Created by: HashiiiCreated on: 30-01-22 00:09 81036521947 Across 1. Amount of energy required to break 1 mole of the stated bond in the gas phase. In terms of bond enthalpies: Enthalpy Change of reaction = Sum of bond enthalpies of reactants – Sum of bond enthalpies of products. (4, 8) 4. The total enthalpy change is independent of the reaction pathway taken. (4, 3) 7. Enthalpy change when reaction occurs in the molar quantities shown in the chemical equation under standard conditions. (8) Down 2. Enthalpy change when 1 mole of a compound is formed from its elements in their standard states under standard conditions. (9) 3. average amount of energy needed to break a specific type of bond, measured over a variety of different molecules.` (4, 4, 8) 5. Heat energy change in a reaction at constant pressure (kJmol −1). (8, 6) 6. Enthalpy change when 1 mole of a substance is completely burned in oxygen under standard conditions. (10) 8. The amount of energy needed to raise a temperature of 1 g of a substance by 1 degree. (8, 4) 9. 100 kPa, 298 K, 1 moldm −3 concentrations of ions. (10) 10. Enthalpy change when an acid and alkali react together under standard conditions to form 1 mole of water. (14)
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