Search results for “Mole”

Acid Strength and Molecular Structure Acids, Bases & Salts Dimensionless The structural factors that determine how readily a molecule releases a proton.

Antibonding Molecular Orbital Chemical Bonding & Molecular Structure Dimensionless A molecular orbital higher in energy than its parent atomic orbitals, whose occupation destabilises the molecule. ψ* = ψ_A − ψ_B

Active Site Chemical Kinetics & Catalysis Dimensionless The specific region of a catalyst or enzyme at which the reacting molecules bind and are transformed.

Addition Reaction Stoichiometry & Chemical Reactions Dimensionless A reaction in which two molecules combine to form a single larger product, with no atoms left over. A + B → AB

Adsorption Chemical Kinetics & Catalysis mol/g The accumulation of molecules of a gas or liquid on the surface of a solid.

Anion Foundations of Chemistry C (charge) A negatively charged ion produced when an atom or molecule gains one or more electrons. X + n e⁻ → Xⁿ⁻

Aromaticity Organic Chemistry kJ/mol The special stability of planar cyclic molecules with a continuous, fully conjugated system of delocalised pi electrons. planar, cyclic, conjugated, 4n+2 π

Association Solutions & Colligative Properties Dimensionless The joining of solute molecules in solution into larger aggregates, reducing the effective number of particles. nA → Aₙ

Atomicity Foundations of Chemistry Dimensionless The number of atoms present in one molecule of an element.

Avogadro's Law States of Matter & Gas Laws L/mol Equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules. V ∝ n

Avogadro's Number Foundations of Chemistry mol⁻¹ The number of elementary entities in one mole of substance, fixed by definition at 6.02214076 × 10²³ mol⁻¹. N = n × N_A

Abnormal Molar Mass Solutions & Colligative Properties g/mol A molar mass value obtained from colligative measurements that differs from the true value because the solute associates or dissociates. M_normal = i × M_observed

Aldol Condensation Organic Chemistry Dimensionless The base-catalysed reaction of two carbonyl compounds to give a beta-hydroxy carbonyl, which often dehydrates to an enone. 2RCH₂CHO → RCH₂CH(OH)CHRCHO

Amphoteric Substance Acids, Bases & Salts Dimensionless A substance able to react as either an acid or a base depending on what it meets.

Association Constant Chemical Equilibrium L/mol The equilibrium constant for the combination of two species into a single associated entity, the reciprocal of the dissociation constant. Ka = 1 / Kd

Atomic Mass Unit Foundations of Chemistry u (Da) A mass unit defined as exactly one twelfth the mass of a free, unbound carbon-12 atom in its ground state. 1 u = 1.66053907 × 10⁻²⁷ kg

Atomic Orbital Atomic Structure & Periodicity Dimensionless A mathematical function describing the region around a nucleus where an electron of given energy is most likely to be found. |ψ|² = probability density

Average Kinetic Energy States of Matter & Gas Laws J The mean translational kinetic energy of the particles in a sample, dependent only on absolute temperature. KE = (3/2)kT per molecule

Results for “Mole”