Energetics Flashcards
Standard enthalpy change of reaction
The enthalpy change when molar quantities of reactants stated in the chemical equation react to form products under Standard condition.
Standard Condition
298K, 1 bar Pressure, solutions at 1moldm-3
Bond energy
The enthalpy change to break 1 mole of covalent bond between 2 gaseous atom.
Calculation of Standard enthalpy change of reaction
1) BE(Rxt) - BE(Pdt)
2) Hc(Rxt) - Hc(Pdt)
3) Hf(Pdt) - Hf(Rxt)
Standard Enthalpy change of Atomisation for elements
Enthalpy change in forming 1 mole of gaseous atom from its element in their standard state at standard condition
Standard Enthalpy change of Atomisation of compound
The enthalpy change in forming gaseous atoms from 1 mole of substance at standard condition.
Standard enthalpy change of Combustion
The enthalpy change to completely burn 1 mole of substance in excess oxygen at standard condition
Standard enthalpy change of Formation
Enthalpy change in forming 1 mole of compound from their constituent elements in their standard state at standard condition.
Standard enthalpy change of Neutralisation
The enthalpy change when an acid react with base to form 1 mole of water in dilute aqueous solution at standard condition.
Hess’ Law
The enthalpy change of a reaction is the same regardless of path taken, given initial state of reactant and final state of product are the same
Lattice Energy
The enthalpy change to form 1 mole of solid ionic compound from its constituent gaseous ions.
First Ionisation Energy
Energy required to remove 1 mole of electrons from 1 mole of gaseous atom to form 1 mole of singly charged gaseous cations.
First Electron Affinity
The enthalpy change when 1 mole of electrons is gained by 1 mole of gaseous atoms to form 1 mole of singly charged gaseous anions.
Standard enthalpy change of Hydration
The enthalpy change when 1 mole of the gaseous ions dissolve in a large amount of water to form 1 mole of aqueous ion under Standard Condition
Standard Enthalpy change of Solution
The enthalpy change when 1 mole of substance is completely dissolved in a large excess of solvent to form an infinitely dilute solution at Standard condition.
