Search results for “pH”

Melting Point States of Matter & Gas Laws °C The temperature at which the solid and liquid phases of a substance coexist in equilibrium at a given pressure. ΔG = 0 at T_m

Methyl Orange Acids, Bases & Salts Dimensionless An acid–base indicator that is red in acid and yellow in alkali, changing between pH 3.1 and 4.4. C₁₄H₁₄N₃NaO₃S

Micelle Solutions & Colligative Properties mol/L A spherical aggregate of surfactant molecules that forms in solution above a characteristic concentration.

Miscibility Solutions & Colligative Properties Dimensionless The ability of two liquids to mix in all proportions to form a single homogeneous phase.

Mixture Foundations of Chemistry Dimensionless A physical combination of two or more substances that keep their own chemical identities and can be present in any proportion.

Neutral Salt Acids, Bases & Salts Dimensionless A salt whose aqueous solution has a pH of 7 because neither of its ions hydrolyses appreciably.

Nucleotide Biochemistry & Polymer Chemistry Dimensionless The monomer of nucleic acids, consisting of a nitrogenous base, a five-carbon sugar and a phosphate group.

Partition Coefficient Chemical Equilibrium Dimensionless The equilibrium ratio of a solute's concentrations in two immiscible phases. P = C₁ / C₂

Plum Pudding Model Atomic Structure & Periodicity Dimensionless J. J. Thomson's 1904 model picturing the atom as a sphere of diffuse positive charge with electrons embedded within it.

Pure Substance Foundations of Chemistry Dimensionless Matter with a fixed chemical composition and a definite set of physical properties, comprising either a single element or a single compound.

SN1 Reaction Organic Chemistry s⁻¹ A two-step nucleophilic substitution proceeding through a carbocation intermediate. rate = k[substrate]

SN2 Reaction Organic Chemistry L/(mol·s) A single-step nucleophilic substitution in which bond formation and bond breaking occur simultaneously. rate = k[substrate][nucleophile]

Solvent Extraction Equilibrium Chemical Equilibrium Dimensionless The equilibrium established when a solute is transferred between two immiscible liquid phases in a separating funnel. efficiency = P V₁ / (P V₁ + V₂)

Supercritical Fluid States of Matter & Gas Laws K, Pa A substance held above both its critical temperature and critical pressure, where liquid and gas phases are indistinguishable. T > T_c and p > p_c

Titration Curve Acids, Bases & Salts Dimensionless A plot of pH against the volume of titrant added during an acid–base titration.

Triple Point States of Matter & Gas Laws K, Pa The unique temperature and pressure at which the solid, liquid and vapour phases of a substance coexist in equilibrium.

Acid–Base Indicator Acids, Bases & Salts Dimensionless A weak acid or base whose conjugate forms have distinctly different colours, used to signal the end point of a titration. HIn ⇌ H⁺ + In⁻

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

Aerosol Solutions & Colligative Properties nm A colloidal system in which solid or liquid particles are dispersed in a gas.

Aldehyde Organic Chemistry Dimensionless A compound containing a carbonyl group bonded to at least one hydrogen atom, so it lies at the end of a chain. R–CHO

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

Alkene Organic Chemistry Dimensionless An unsaturated hydrocarbon containing at least one carbon–carbon double bond. CₙH₂ₙ

Amine Organic Chemistry Dimensionless A compound derived from ammonia by replacing one or more hydrogens with alkyl or aryl groups. R–NH₂, R₂NH, R₃N

Arene Organic Chemistry Dimensionless An aromatic hydrocarbon containing one or more benzene rings. CₙH₂ₙ₋₆

Results for “pH”