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960 terms · page 12 of 40
Distillation
A separation technique that exploits differences in volatility by vaporising a liquid and condensing the vapour in a separate vessel.
Chemical EquilibriumDistribution Law
The principle that a solute distributes itself between two immiscible solvents in a constant ratio at fixed temperature.
Biochemistry & Polymer ChemistryDNA
The double-stranded nucleic acid that carries the hereditary information of almost all living organisms.
Stoichiometry & Chemical ReactionsDouble Displacement Reaction
A reaction in which two compounds exchange partner ions to form two new compounds.
Biochemistry & Polymer ChemistryDouble Helix
The structure of DNA, in which two antiparallel polynucleotide strands wind around a common axis.
Acids, Bases & SaltsDouble Salt
A salt containing two different cations or anions that dissociates completely into all its constituent ions in solution.
Electrochemistry & RedoxDry Cell
A primary cell using a moist paste rather than a liquid electrolyte, so it can be used in any orientation.
Chemical EquilibriumDynamic Equilibrium
An equilibrium in which opposing processes continue at the molecular level but at equal and opposite rates.
Inorganic & Coordination Chemistryd–d Transition
The promotion of an electron between split d orbitals, responsible for the characteristic colours of transition metal complexes.
Organic ChemistryE1 Reaction
A two-step elimination proceeding through a carbocation, which then loses a proton to form an alkene.
Organic ChemistryE2 Reaction
A single-step elimination in which a base removes a proton as the leaving group departs, forming a double bond.
Solutions & Colligative PropertiesEbullioscopic Constant
The boiling point elevation produced by a one-molal solution of a non-electrolyte in a given solvent.
Chemical EquilibriumEffect of a Catalyst on Equilibrium
A catalyst changes how quickly equilibrium is reached but never where that equilibrium lies.
Chemical EquilibriumEffect of an Inert Gas
The influence of adding a non-reacting gas on the position of a gaseous equilibrium.
Chemical EquilibriumEffect of Concentration Change
The shift in equilibrium position caused by adding or removing a reactant or product.
Chemical EquilibriumEffect of Pressure Change
The shift in a gaseous equilibrium caused by changing the total pressure through a volume change.
Chemical EquilibriumEffect of Temperature Change
The shift in equilibrium caused by heating or cooling, which uniquely also changes the equilibrium constant.
Inorganic & Coordination ChemistryEffective Atomic Number Rule
The observation that stable metal carbonyls tend to have a total electron count equal to that of the next noble gas.
Chemical Kinetics & CatalysisEffective Collision
A collision that actually leads to reaction because it has both sufficient energy and correct orientation.
Atomic Structure & PeriodicityEffective Nuclear Charge
The net positive charge actually experienced by a particular electron after allowing for shielding by other electrons.
Stoichiometry & Chemical ReactionsEffervescence
The rapid escape of gas bubbles from a liquid during a chemical reaction.
States of Matter & Gas LawsEffusion
The escape of gas molecules one at a time through a hole much smaller than the mean free path.
Electrochemistry & RedoxElectrochemical Cell
A device in which a redox reaction and an electric current are interconverted through two separated electrodes.
Electrochemistry & RedoxElectrochemical Equivalent
The mass of a substance liberated by the passage of one coulomb of charge.