Search results for “Mole”

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

Anion Foundations of Chemistry C (charge) A negatively charged ion produced when an atom or molecule gains one or more electrons. X + n e⁻ → Xⁿ⁻

Aromaticity Organic Chemistry kJ/mol The special stability of planar cyclic molecules with a continuous, fully conjugated system of delocalised pi electrons. planar, cyclic, conjugated, 4n+2 π

Association Solutions & Colligative Properties Dimensionless The joining of solute molecules in solution into larger aggregates, reducing the effective number of particles. nA → Aₙ

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

Avogadro's Law States of Matter & Gas Laws L/mol Equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules. V ∝ n

Avogadro's Number Foundations of Chemistry mol⁻¹ The number of elementary entities in one mole of substance, fixed by definition at 6.02214076 × 10²³ mol⁻¹. N = n × N_A

Bent Geometry Chemical Bonding & Molecular Structure degrees A molecular shape in which two bonded atoms form an angle at a central atom that also carries one or more lone pairs. AX₂E or AX₂E₂

Bond Dissociation Enthalpy Thermochemistry & Thermodynamics kJ/mol The enthalpy change when one mole of a specific bond is broken homolytically in the gas phase. A–B(g) → A·(g) + B·(g)

Bond Energy Chemical Bonding & Molecular Structure kJ/mol The energy required to break one mole of a given bond homolytically in the gaseous state. A–B(g) → A(g) + B(g)

Bond Order Chemical Bonding & Molecular Structure Dimensionless The number of chemical bonds between a pair of atoms, or in molecular orbital terms half the difference between bonding and antibonding electrons. BO = (N_b − N_a) / 2

Brownian Motion Solutions & Colligative Properties m²/s The continuous random zigzag movement of colloidal particles caused by uneven bombardment from surrounding molecules. ⟨x²⟩ = 2Dt

Carbohydrate Biochemistry & Polymer Chemistry Dimensionless A biomolecule composed of carbon, hydrogen and oxygen, usually with hydrogen and oxygen in the ratio found in water. Cₓ(H₂O)_y

Carbon-13 NMR Analytical Chemistry & Spectroscopy ppm An NMR technique that detects the carbon-13 nucleus to reveal the carbon skeleton of a molecule. δ 0–220 ppm

Cation Foundations of Chemistry C (charge) A positively charged ion produced when an atom or molecule loses one or more electrons. M → Mⁿ⁺ + n e⁻

Chirality Organic Chemistry Dimensionless The property of a molecule that makes it non-superimposable on its mirror image.

Chromophore Analytical Chemistry & Spectroscopy nm The part of a molecule responsible for absorbing light at a particular wavelength.

Coenzyme Biochemistry & Polymer Chemistry Dimensionless A small organic molecule that binds temporarily to an enzyme and is essential for its catalytic activity.

Condensation Polymerisation Biochemistry & Polymer Chemistry Dimensionless Polymerisation in which monomers join with the elimination of a small molecule, usually water. n A + n B → –(AB)ₙ– + n H₂O

Condensation Reaction Stoichiometry & Chemical Reactions Dimensionless A reaction in which two molecules join with the elimination of a small molecule, usually water. A–OH + H–B → A–B + H₂O

Conformational Isomerism Organic Chemistry kJ/mol The different spatial arrangements a molecule can adopt through rotation about single bonds.

Coordination Compound Inorganic & Coordination Chemistry Dimensionless A compound containing a central metal atom or ion bonded to surrounding molecules or ions by coordinate bonds. [M(L)ₙ]Xₘ

Degree of Ionisation Acids, Bases & Salts Dimensionless The fraction of dissolved electrolyte molecules that have broken into ions at equilibrium. α = ionised / total

Dehydration Reaction Stoichiometry & Chemical Reactions Dimensionless A reaction in which water is removed from a single molecule, generally producing an unsaturated or condensed product. R–CH₂–CH₂OH → R–CH=CH₂ + H₂O

Results for “Mole”