Search results for “Mole”

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

Base Peak Analytical Chemistry & Spectroscopy Dimensionless The most intense peak in a mass spectrum, assigned an arbitrary relative abundance of 100%.

Biochemistry Biochemistry & Polymer Chemistry Dimensionless The study of the chemical substances and processes that occur within living organisms.

Boiling Point States of Matter & Gas Laws °C The temperature at which the vapour pressure of a liquid equals the external pressure acting on it. p_vap = p_external

Bonding Pair Chemical Bonding & Molecular Structure Dimensionless A pair of electrons shared between two atoms and responsible for holding them together.

Boyle's Law States of Matter & Gas Laws Pa·m³ At constant temperature, the volume of a fixed mass of gas is inversely proportional to its pressure. p₁V₁ = p₂V₂

Calorific Value Thermochemistry & Thermodynamics kJ/g The heat released by the complete combustion of unit mass of a fuel. CV = ΔH_c / molar mass

Cannizzaro Reaction Organic Chemistry Dimensionless The disproportionation of an aldehyde with no alpha hydrogen under concentrated alkali into an alcohol and a carboxylate. 2RCHO + OH⁻ → RCH₂OH + RCOO⁻

Chain Isomerism Organic Chemistry Dimensionless Structural isomerism arising from different arrangements of the carbon skeleton.

Chain Reaction Chemical Kinetics & Catalysis Dimensionless A self-sustaining reaction sequence in which a reactive intermediate regenerates itself at each cycle. initiation → propagation → termination

Charles's Law States of Matter & Gas Laws m³/K At constant pressure, the volume of a fixed mass of gas is directly proportional to its absolute temperature. V₁ / T₁ = V₂ / T₂

Chelate Effect Inorganic & Coordination Chemistry kJ/mol The greater stability of a complex containing a multidentate ligand compared with one containing equivalent monodentate ligands. ΔS favourable

Chemical Formula Foundations of Chemistry Dimensionless A symbolic notation that states which elements a substance contains and in what proportions, using element symbols and subscripts.

Chemisorption Chemical Kinetics & Catalysis kJ/mol Strong adsorption in which actual chemical bonds form between the adsorbate and the surface. ΔH ≈ −80 to −400 kJ/mol

Collision Frequency Chemical Kinetics & Catalysis s⁻¹ The number of collisions occurring per unit volume per unit time in a reacting mixture. Z ∝ n²σ√T

Compressibility Factor States of Matter & Gas Laws Dimensionless The ratio of the actual molar volume of a gas to that predicted by the ideal gas law. Z = pV / nRT

Condensation States of Matter & Gas Laws kJ/mol The change of a substance from the gaseous to the liquid state, accompanied by the release of latent heat.

Covalent Bond Chemical Bonding & Molecular Structure kJ/mol A bond formed when two atoms share one or more pairs of electrons so that both achieve a stable configuration. A· + ·B → A:B

Results for “Mole”