Results for “pH”
291 terms · page 4 of 13
Melting Point
The temperature at which the solid and liquid phases of a substance coexist in equilibrium at a given pressure.
Acids, Bases & SaltsMethyl Orange
An acid–base indicator that is red in acid and yellow in alkali, changing between pH 3.1 and 4.4.
Solutions & Colligative PropertiesMicelle
A spherical aggregate of surfactant molecules that forms in solution above a characteristic concentration.
Solutions & Colligative PropertiesMiscibility
The ability of two liquids to mix in all proportions to form a single homogeneous phase.
Foundations of ChemistryMixture
A physical combination of two or more substances that keep their own chemical identities and can be present in any proportion.
Acids, Bases & SaltsNeutral Salt
A salt whose aqueous solution has a pH of 7 because neither of its ions hydrolyses appreciably.
Biochemistry & Polymer ChemistryNucleotide
The monomer of nucleic acids, consisting of a nitrogenous base, a five-carbon sugar and a phosphate group.
Chemical EquilibriumPartition Coefficient
The equilibrium ratio of a solute's concentrations in two immiscible phases.
Atomic Structure & PeriodicityPlum Pudding Model
J. J. Thomson's 1904 model picturing the atom as a sphere of diffuse positive charge with electrons embedded within it.
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.
Organic ChemistrySN1 Reaction
A two-step nucleophilic substitution proceeding through a carbocation intermediate.
Organic ChemistrySN2 Reaction
A single-step nucleophilic substitution in which bond formation and bond breaking occur simultaneously.
Chemical EquilibriumSolvent Extraction Equilibrium
The equilibrium established when a solute is transferred between two immiscible liquid phases in a separating funnel.
States of Matter & Gas LawsSupercritical Fluid
A substance held above both its critical temperature and critical pressure, where liquid and gas phases are indistinguishable.
Acids, Bases & SaltsTitration Curve
A plot of pH against the volume of titrant added during an acid–base titration.
States of Matter & Gas LawsTriple Point
The unique temperature and pressure at which the solid, liquid and vapour phases of a substance coexist in equilibrium.
Acids, Bases & SaltsAcid–Base Indicator
A weak acid or base whose conjugate forms have distinctly different colours, used to signal the end point of a titration.
Chemical Kinetics & CatalysisAdsorption
The accumulation of molecules of a gas or liquid on the surface of a solid.
Solutions & Colligative PropertiesAerosol
A colloidal system in which solid or liquid particles are dispersed in a gas.
Organic ChemistryAldehyde
A compound containing a carbonyl group bonded to at least one hydrogen atom, so it lies at the end of a chain.
Organic ChemistryAldol Condensation
The base-catalysed reaction of two carbonyl compounds to give a beta-hydroxy carbonyl, which often dehydrates to an enone.
Organic ChemistryAlkene
An unsaturated hydrocarbon containing at least one carbon–carbon double bond.
Organic ChemistryAmine
A compound derived from ammonia by replacing one or more hydrogens with alkyl or aryl groups.
Organic ChemistryArene
An aromatic hydrocarbon containing one or more benzene rings.