Search results for “pH”

Adenosine Triphosphate Biochemistry & Polymer Chemistry kJ/mol The nucleotide that acts as the universal energy currency of living cells. ATP + H₂O → ADP + Pᵢ

Alpha Decay Nuclear & Radiochemistry MeV Radioactive decay in which a nucleus emits a helium-4 nucleus, losing two protons and two neutrons. ᴬ_Z X → ᴬ⁻⁴_Z₋₂ Y + ⁴₂He

Amorphous Solid States of Matter & Gas Laws Dimensionless A solid whose particles lack long-range order, showing only the short-range regularity characteristic of a frozen liquid.

Amphiprotic Species Acids, Bases & Salts Dimensionless A species that can both donate and accept a proton.

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

Acidic Buffer Acids, Bases & Salts Dimensionless A buffer made from a weak acid and one of its salts, giving a pH below 7. pH = pKa + log([salt]/[acid])

Acidic Salt Acids, Bases & Salts Dimensionless A salt whose aqueous solution has a pH below 7, or one that still contains replaceable hydrogen.

Acid–Base Titration Acids, Bases & Salts mol/L A titration in which an acid is neutralised by a base, or the reverse, monitored by an indicator or a pH meter. M_aV_a / n_a = M_bV_b / n_b

Allotropy Foundations of Chemistry Dimensionless The existence of an element in two or more distinct structural forms within the same physical state.

Anisotropy States of Matter & Gas Laws Dimensionless The dependence of a physical property on the direction in which it is measured.

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

Atomic Absorption Spectroscopy Analytical Chemistry & Spectroscopy ppm A technique that measures the concentration of a metal from the light its free gaseous atoms absorb. A = εlc

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

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

Acidic Solution Acids, Bases & Salts mol/L A solution in which the hydrogen ion concentration exceeds the hydroxide ion concentration. [H⁺] > [OH⁻]

Anode Electrochemistry & Redox Dimensionless The electrode at which oxidation occurs.

Atom Foundations of Chemistry Dimensionless The smallest particle of an element that retains the chemical identity of that element.

Results for “pH”