Terms starting with P
72 terms · page 3 of 3
Position Isomerism
Structural isomerism arising from a functional group occupying different positions on the same carbon skeleton.
Solutions & Colligative PropertiesPositive Deviation
Behaviour in which a solution exerts a higher vapour pressure than Raoult's law predicts.
Nuclear & RadiochemistryPositron Emission
Radioactive decay in which a proton converts into a neutron, emitting a positron and a neutrino.
Chemical Kinetics & CatalysisPre-exponential Factor
The constant A in the Arrhenius equation, representing the frequency of appropriately oriented collisions.
Stoichiometry & Chemical ReactionsPrecipitate
An insoluble solid that separates from a solution as the result of a chemical reaction.
Stoichiometry & Chemical ReactionsPrecipitation Reaction
A reaction in which two solutions combine to form an insoluble solid that separates from the mixture.
Analytical Chemistry & SpectroscopyPrecipitation Titration
A titration in which the analyte and titrant combine to form an insoluble product.
Foundations of ChemistryPrecision
The closeness of repeated measurements of the same quantity to one another, regardless of their accuracy.
Chemical EquilibriumPredicting Precipitation
The use of the ionic product and solubility product to decide whether a solid will form on mixing two solutions.
Chemical EquilibriumPressure Equilibrium Constant
The equilibrium constant for a gaseous reaction expressed in terms of partial pressures.
Electrochemistry & RedoxPrimary Cell
A cell in which the electrode reaction is irreversible, so it cannot be recharged.
Analytical Chemistry & SpectroscopyPrimary Standard
A highly pure, stable substance that can be weighed accurately and used directly to prepare a solution of known concentration.
Biochemistry & Polymer ChemistryPrimary Structure
The linear sequence of amino acids in a polypeptide chain.
Inorganic & Coordination ChemistryPrimary Valence
In Werner's theory, the ionisable valence of a metal, equal to its oxidation state and satisfied by negative ions.
Atomic Structure & PeriodicityPrincipal Quantum Number
The quantum number n that specifies the main energy level and average distance of an electron from the nucleus.
Stoichiometry & Chemical ReactionsProduct
A substance formed as a result of a chemical reaction.
Chemical Kinetics & CatalysisPromoter
A substance that has little catalytic activity itself but greatly increases the effectiveness of a catalyst.
Biochemistry & Polymer ChemistryProtein
A large biomolecule made of one or more chains of amino acids folded into a specific three-dimensional shape.
Atomic Structure & PeriodicityProton
A positively charged subatomic particle found in the atomic nucleus, carrying a charge of +1 elementary unit.
Acids, Bases & SaltsProton Affinity
The energy released when a gaseous species accepts a proton, measuring intrinsic basicity free of solvent effects.
Chemical Kinetics & CatalysisPseudo-First-Order Reaction
A higher-order reaction that behaves as first order because one reactant is present in such large excess that its concentration is…
Foundations of ChemistryPure Substance
Matter with a fixed chemical composition and a definite set of physical properties, comprising either a single element or a single compound.
Foundations of ChemistryPurity
The mass fraction of the desired substance in a sample, usually expressed as a percentage of the total mass.
Stoichiometry & Chemical ReactionsPyrolysis
The thermal decomposition of a substance at high temperature in the absence of oxygen.