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CHEM_DEFINITION
stability constant
equilibrium constant for the formation of a complex ion in solution
partial coefficient
ratio of the concentrations of a solute in 2 solvents at equilibrium
enthalpy change of atomisation
energy change when 1 mole of gaseous atoms are formed from an element in its
standard state
lattice energy
enthalpy change when 1 mole of ionic solid is formed from its gaseous ions
under standard conditions
enthalpy change of hydration
energy change when 1 mole of gaseous ion is dissolved in water to form
hydrated ions of infinite dilute under standard conditions
enthalpy change of solution
energy change when one mole of solute is dissolved in an infinite amount of
water to form a dilute solution under standard conditions
entropy
measure of disorder, randomness and dispersal of energy of particles
standard Gibbs free energy change of reaction
measure of ability of a system to do work
standard electrode potential
potential difference when a half-cell is connected to a standard hydrogen
electrode under standard conditions
standard cell potential

CHEM_DEFINITION

1

maximum potential difference between 2 half cells when no current is flowing
under standard conditions of 25C, 1 atm pressure and in solution of 1M
concentration
buffer solution
solution that resist large pH change on addition of small amounts of acid or alkali
solubility
maximum amount that can dissolve in a fixed volume or fixed mass of solvent at
a fixed temperature
solubility product
product of conc of ions in a saturated solution of salt, raised to the appropriate
lowers
transition element
elements forming one or more stable ions with partially filled d orbital
transition metal complex
a molecule or ion formed by a central metal ion surrounded by one or more
ligands
complex ion
an ions formed by a central metal ion bonded to one or more ligands
coordination number
number of bonds bonded to an atom / metal
monodentate ligand
forms 1 dative bond to central metal ion per ligand
bidentate ligand
one ligand use 2 lone pairs to form 2 dative bond to central metal ion
polydentate ligand
one ligand use many lone pairs to form many dative bond to central metal ion
homogeneous catalysis - transitional element
variable oxidation state enable transitional element to take part in a sequence of
redox reaction with lower Ea
heterogeneous catalysis - transitional element

CHEM_DEFINITION

2

partially filled d orbital enable transition metals to form weak temporary bonds
with reactant molecules
rate-determining step
slowest step in the mechanism
order of reaction
the power to which a concentration of a reactant is raised in the rate equation
partition
separation due to the different solubilities of compound in two solvents
adsorption
separation due to the different attractions between the compounds and the
stationary phase, relative to their solubility in the solvent
Rf value
retention factor
distance moved by compound from baseline over distance travelled by solvent
front

CHEM_DEFINITION

3



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