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960 terms · page 33 of 40
Relationship between K and Rate Constants
The equilibrium constant of an elementary reaction equals the ratio of its forward and reverse rate constants.
Acids, Bases & SaltsRelationship between Ka and Kb
The reciprocal link between the strengths of an acid and its conjugate base.
Chemical EquilibriumRelationship between Kp and Kc
The conversion linking the pressure and concentration forms of the equilibrium constant for a gaseous reaction.
Foundations of ChemistryRelative Atomic Mass
The weighted average mass of the atoms of an element, expressed relative to one twelfth the mass of a carbon-12 atom.
Solutions & Colligative PropertiesRelative Lowering of Vapour Pressure
The fractional reduction in a solvent's vapour pressure caused by dissolving a non-volatile solute.
Chemical Bonding & Molecular StructureResonance
The description of a molecule whose true structure is a weighted average of two or more valid Lewis structures.
Organic ChemistryResonance Effect
The delocalisation of pi or lone pair electrons through a conjugated system, altering electron density at distant atoms.
Chemical Bonding & Molecular StructureResonance Energy
The extra stability a molecule gains from electron delocalisation, measured against the most stable single Lewis structure.
Analytical Chemistry & SpectroscopyRetention Factor
The ratio of the distance travelled by a component to the distance travelled by the solvent front.
Solutions & Colligative PropertiesReverse Osmosis
The forced flow of solvent from a concentrated to a dilute solution by applying pressure greater than the osmotic pressure.
Thermochemistry & ThermodynamicsReversible Process
An idealised process carried out through a continuous series of equilibrium states, so it can be reversed by an infinitesimal change.
Stoichiometry & Chemical ReactionsReversible Reaction
A reaction that can proceed in both the forward and reverse directions under the same conditions.
Biochemistry & Polymer ChemistryRNA
A generally single-stranded nucleic acid that carries out the expression of genetic information.
Stoichiometry & Chemical ReactionsRoasting
The heating of a sulfide ore strongly in a plentiful supply of air to convert it into the oxide.
States of Matter & Gas LawsRoot Mean Square Speed
The square root of the average of the squared molecular speeds in a gas sample.
Electrochemistry & RedoxRusting
The corrosion of iron in the presence of both oxygen and water to form hydrated iron(III) oxide.
Atomic Structure & PeriodicityRutherford Model
The nuclear model of the atom, in which a tiny dense positive nucleus is surrounded by orbiting electrons in mostly empty space.
Atomic Structure & PeriodicityRydberg Formula
The empirical equation predicting the wavelengths of the spectral lines emitted by a hydrogen-like atom.
Atomic Structure & Periodicitys-Block Elements
The elements of groups 1 and 2, plus helium, whose outermost electrons occupy an s orbital.
Electrochemistry & RedoxSacrificial Anode
A block of reactive metal attached to a structure so that it corrodes preferentially and protects the structure.
Acids, Bases & SaltsSalt
An ionic compound formed when the hydrogen of an acid is replaced by a metal or other cation.
Electrochemistry & RedoxSalt Bridge
A conducting connection between the two half-cells of a galvanic cell that completes the circuit and maintains electrical neutrality.
Acids, Bases & SaltsSalt Hydrolysis
The reaction of a salt's ions with water to produce an acidic or alkaline solution.
Analytical Chemistry & SpectroscopySampling
The process of selecting a small portion of material that genuinely represents the bulk being analysed.