Browse the dictionary
960 terms · page 30 of 40
Polar Covalent Bond
A covalent bond in which the shared electrons are unequally distributed because the bonded atoms differ in electronegativity.
Chemical Bonding & Molecular StructurePolarisability
The ease with which the electron cloud of an atom, ion or molecule can be distorted by an external electric field.
Chemical Bonding & Molecular StructurePolarising Power
The ability of a cation to distort the electron cloud of a neighbouring anion.
Foundations of ChemistryPolyatomic Ion
A covalently bonded group of atoms that carries an overall electrical charge and behaves as a single unit in reactions.
Inorganic & Coordination ChemistryPolydentate Ligand
A ligand that binds to a single metal centre through three or more donor atoms.
Biochemistry & Polymer ChemistryPolymer
A large molecule built from many repeating structural units joined by covalent bonds.
States of Matter & Gas LawsPolymorphism
The ability of a single substance to exist in more than one crystalline form.
Acids, Bases & SaltsPolyprotic Acid
An acid capable of donating more than one proton per molecule.
Biochemistry & Polymer ChemistryPolysaccharide
A carbohydrate polymer built from many monosaccharide units linked by glycosidic bonds.
Organic ChemistryPosition 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.