Thermodynamics l Flashcards
Define Standard Enthalpy Change of reaction.
The amount of energy absorbed or released when its reactants in molar quantity in the chemical equation reacts fully under standard conditions.
Define Standard Enthalpy change of combustion.
The amount of energy released when one moles of reactants is completely burnt in EXCESS oxygen under standard conditions.
Define Standard Enthalpy change of neutralisation.
The amount of energy released when one moles of water is formed under the neutralisation of an acid alkali reaction under standard conditions.
Define Standard Enthalpy change of atomisation. (For both elements and compound)
Elements:
The amount heat energy absorbed for one moles of free gaseous atoms to be formed from its elements under standard conditions.
Compound:
The amount of heat energy absorbed when one moles of compound in standard state is broken down into gaseous atoms of its constituent elements under standard conditions.
Define Bond Energy.
The average amount of energy absorbed to break one moles of covalent bond in gaseous state.
Define Standard Enthalpy change of formation.
The amount of heat energy absorbed or released to form one moles of compound from its constituent elements, all in standard state, under standard condition.
Define Ionisation Energy.
The amount of energy absorbed when one moles of gaseous atom loses one mole of electron to form one mole of singly charged gaseous cation.
Define first electron affinity
The amount of heat energy released when one moles of gaseous atom gains one moles of electron to form one mole of singly charged gaseous anion.
Define second electron affinity
Th amount of heat energy absorbed when one mols of singly charged gaseous anion gains one moles of electron to form one moles of doubly charged gaseous anion.
Define lattice energy.
The amount of heat energy released when one moles of solid ionic compound is formed from its constituent free gaseous ions under standard conditions.
Define Standard Enthalpy change of hydration.
The amount of heat energy released when one moles of free gaseous ions are dissolved in large amount of water to form a solution at infinite dilution under standard conditions.
Define Standard Enthalpy change of solution.
The amount of heat energy absorbed or released for one moles of solute to dissolve in a large amount of water to form solution at infinite dilution under standard conditions.
