UNIT 5 DEFINITIONS Flashcards
Coordinate bond
A shared pair of electrons in which the bonded pair has been provided by one of the bonding atoms only.
Coordination number
The total number of coordinate bonds formed between the central metal ion and any ligands.
First electron affinity
The enthalpy change that accompanies the addition of one electron to each atom in one mole of gaseous atoms to form one mole of gaseous 1- ions.
Second electron affinity
The enthalpy change that accompanies the addition of one electron to each ion in one mole of gaseous 1- ions to form one mole of gaseous 2- ions.
Standard enthalpy change of atomisation
The enthalpy change that takes place when one mole of gaseous atoms forms from the element in standard state.
Standard enthalpy change of hydration
The enthalpy change that takes place when one mole of isolated gaseous ions is dissolved in water, forming 1 mol of aqueous ions, under standard conditions.
Standard enthalpy change of solution
The enthalpy change that takes place when one mole of a compound is completely dissolved in water under standard conditions.
Standard entropy change of reaction
The entropy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions , all reactants and products being in their standard states.
Lattice enthalpy
The enthalpy change that accompanies the formation of one mole of an ionic compound from its gaseous ions under standard conditions.
Standard electrode potential
The e.m.f of a half cell compared with a standard hydrogen half cell , measured at 298K with solution concentrations of 1 mol dm-3 and a gas pressure of 100kPa
Complex ion
A central ion surrounded by Luganda
Rate determining step
The slowest step
Half-equation
An equation involving electrons that shows a species being oxidised or reduced
