Results for “pH”
291 terms · page 1 of 13
pH
The negative logarithm to base ten of the hydrogen ion concentration, measuring the acidity of a solution.
Acids, Bases & SaltspH Scale
The conventional scale, usually running from 0 to 14, on which the acidity or alkalinity of aqueous solutions is expressed.
States of Matter & Gas LawsPhase Diagram
A pressure–temperature plot showing which phase of a substance is thermodynamically stable under any given conditions.
Chemical EquilibriumPhase Equilibrium
The condition in which two or more phases of a substance coexist with no net transfer between them.
Organic ChemistryPhenol
A compound in which a hydroxyl group is bonded directly to an aromatic ring.
Acids, Bases & SaltsPhenolphthalein
An acid–base indicator that is colourless in acid and pink in alkaline solution, changing between pH 8.3 and 10.0.
Biochemistry & Polymer ChemistryPhospholipid
A lipid in which one fatty acid of a triglyceride is replaced by a phosphate-containing group.
Chemical Kinetics & CatalysisPhotochemical Quantum Yield
The number of molecules reacting for each photon of light absorbed by the system.
Stoichiometry & Chemical ReactionsPhotochemical Reaction
A reaction initiated by the absorption of light, which promotes a molecule to an electronically excited state.
Biochemistry & Polymer ChemistryPhotosynthesis
The process by which plants use light energy to convert carbon dioxide and water into carbohydrate and oxygen.
Foundations of ChemistryPhysical Change
A change that alters the form or state of a substance while leaving its chemical composition intact.
Chemical EquilibriumPhysical Equilibrium
An equilibrium between two physical states or phases of the same substance.
Foundations of ChemistryPhysical Property
A characteristic of a substance that can be observed or measured without altering its chemical identity.
Chemical Kinetics & CatalysisPhysisorption
Weak adsorption in which molecules are held to a surface by van der Waals forces alone.
Biochemistry & Polymer ChemistryAdenosine Triphosphate
The nucleotide that acts as the universal energy currency of living cells.
Nuclear & RadiochemistryAlpha Decay
Radioactive decay in which a nucleus emits a helium-4 nucleus, losing two protons and two neutrons.
States of Matter & Gas LawsAmorphous Solid
A solid whose particles lack long-range order, showing only the short-range regularity characteristic of a frozen liquid.
Acids, Bases & SaltsAmphiprotic Species
A species that can both donate and accept a proton.
Acids, Bases & SaltsAmphoteric Substance
A substance able to react as either an acid or a base depending on what it meets.
Analytical Chemistry & SpectroscopyChromatography
A family of separation techniques that partition components between a stationary and a mobile phase.
Analytical Chemistry & SpectroscopyChromophore
The part of a molecule responsible for absorbing light at a particular wavelength.
Analytical Chemistry & SpectroscopyColumn Chromatography
A preparative technique in which a mixture is separated by passing it down a vertical column packed with stationary phase.
Inorganic & Coordination ChemistryCoordination Sphere
The central metal together with the ligands directly attached to it, written inside square brackets.
Organic ChemistryElectrophile
An electron-deficient species that seeks and accepts a pair of electrons from an electron-rich centre.