Search results for “pH”

Starch Biochemistry & Polymer Chemistry Dimensionless The storage polysaccharide of plants, consisting of amylose and amylopectin. (C₆H₁₀O₅)ₙ

Stepwise Ionisation Acids, Bases & Salts mol/L The successive loss of protons from a polyprotic acid, each governed by its own equilibrium constant. Ka₁ ≫ Ka₂ ≫ Ka₃

Stock Solution Solutions & Colligative Properties mol/L A concentrated solution prepared in advance and stored for later dilution to working strength.

Strong Acid Acids, Bases & Salts mol/L An acid that ionises essentially completely in aqueous solution. HA → H⁺ + A⁻ (complete)

Structural Isomerism Organic Chemistry Dimensionless Isomerism in which the compounds differ in the order in which their atoms are connected.

Sublimation States of Matter & Gas Laws kJ/mol The direct conversion of a solid into a vapour without passing through the liquid state. ΔH_sub = ΔH_fus + ΔH_vap

Substitution Reaction Stoichiometry & Chemical Reactions Dimensionless A reaction in which one atom or group in a molecule is replaced by another. R–X + Y → R–Y + X

Superacid Acids, Bases & Salts Dimensionless An acid stronger than pure sulfuric acid, capable of protonating species normally regarded as completely non-basic. H₀ < −12

Termolecular Reaction Chemical Kinetics & Catalysis L²/(mol²·s) An elementary step requiring the simultaneous collision of three species. rate = k[A][B][C]

Tertiary Structure Biochemistry & Polymer Chemistry Dimensionless The complete three-dimensional folded shape of a single polypeptide chain.

Thermochemical Equation Thermochemistry & Thermodynamics kJ/mol A balanced chemical equation that also states the enthalpy change for the amounts shown. aA + bB → cC, ΔH = x kJ

Unsaturated Solution Solutions & Colligative Properties mol/L A solution containing less dissolved solute than it could hold at the given temperature.

Weak Acid Acids, Bases & Salts mol/L An acid that ionises only partially in aqueous solution, establishing an equilibrium with its conjugate base. HA ⇌ H⁺ + A⁻

Werner's Theory Inorganic & Coordination Chemistry Dimensionless The 1893 theory proposing that metals exhibit two types of valence and that ligands occupy fixed positions in space around the metal.

Zwitterion Biochemistry & Polymer Chemistry Dimensionless A molecule carrying both a positive and a negative charge but no net overall charge. ⁺H₃N–CHR–COO⁻

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.

Bidentate Ligand Inorganic & Coordination Chemistry Dimensionless A ligand that binds to the same metal centre through two donor atoms, forming a ring.

Bimolecular Reaction Chemical Kinetics & Catalysis L/(mol·s) An elementary step in which two species collide and react. A + B → products, rate = k[A][B]

Biodegradable Polymer Biochemistry & Polymer Chemistry Dimensionless A polymer that can be broken down into simple substances by the action of microorganisms.

Blank Analytical Chemistry & Spectroscopy Various A sample containing everything except the analyte, measured to correct for background signal.

Body-Centred Cubic States of Matter & Gas Laws Dimensionless A cubic arrangement with particles at the eight corners plus one at the centre of the cell. 2 atoms per cell, 68% packing

Calomel Electrode Electrochemistry & Redox V A reference electrode based on the equilibrium between mercury, mercury(I) chloride and chloride ions. Hg₂Cl₂ + 2e⁻ ⇌ 2Hg + 2Cl⁻

Results for “pH”