Terms starting with R
53 terms · page 2 of 3
Reaction Rate
The change in concentration of a reactant or product per unit time.
Foundations of ChemistryReagent
A substance added to a system to bring about a chemical reaction or to test for the presence of another substance.
States of Matter & Gas LawsReal Gas
An actual gas whose behaviour deviates from the ideal gas law because its molecules occupy volume and attract one another.
Stoichiometry & Chemical ReactionsRearrangement Reaction
A reaction in which the atoms of a molecule are reorganised to give a structural isomer.
Electrochemistry & RedoxRedox Couple
The oxidised and reduced forms of the same species, considered together as a conjugate pair.
Stoichiometry & Chemical ReactionsRedox Reaction
A reaction in which electrons are transferred, so that one species is oxidised while another is reduced.
Analytical Chemistry & SpectroscopyRedox Titration
A titration in which the reaction between titrant and analyte involves electron transfer.
Electrochemistry & RedoxReducing Agent
A species that donates electrons to another substance and is itself oxidised in the process.
Biochemistry & Polymer ChemistryReducing Sugar
A sugar with a free aldehyde or ketone group that can reduce mild oxidising agents.
Electrochemistry & RedoxReduction
The gain of electrons by a species, accompanied by a decrease in its oxidation number.
Electrochemistry & RedoxReference Electrode
A half-cell with a stable, known and reproducible potential, used as a fixed point against which other potentials are measured.
Chemical EquilibriumRelationship 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.