Search results for “Mole”

Semipermeable Membrane Solutions & Colligative Properties Dimensionless A barrier that allows solvent molecules to pass while blocking larger solute particles.

Solution Solutions & Colligative Properties Dimensionless A homogeneous mixture in which one or more substances are dispersed uniformly at the molecular or ionic level in another.

Solvation Solutions & Colligative Properties kJ/mol The surrounding and stabilisation of a solute particle by a shell of solvent molecules.

Standard Enthalpy of Combustion Thermochemistry & Thermodynamics kJ/mol The enthalpy change when one mole of a substance burns completely in excess oxygen under standard conditions. ΔH_c°

Standard Enthalpy of Formation Thermochemistry & Thermodynamics kJ/mol The enthalpy change when one mole of a compound forms from its elements in their standard states. ΔH_f°

Standard Molar Entropy Thermochemistry & Thermodynamics J/(mol·K) The absolute entropy of one mole of a substance in its standard state at 298 K. ΔS° = ΣS°(products) − ΣS°(reactants)

Stereoisomerism Organic Chemistry Dimensionless Isomerism in which molecules have identical connectivity but differ in the spatial arrangement of their atoms.

Stoichiometry Stoichiometry & Chemical Reactions mol The quantitative study of the mass and mole relationships between reactants and products in a chemical reaction. n_A / a = n_B / b

Structural Formula Foundations of Chemistry Dimensionless A representation showing how the atoms in a molecule are connected and, often, how they are arranged in space.

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

Surface Tension States of Matter & Gas Laws N/m The energy required to increase the surface area of a liquid by unit amount, arising from unbalanced intermolecular forces at the surface. γ = F / L

Tetrahedral Geometry Chemical Bonding & Molecular Structure degrees A molecular shape with four bonded atoms directed to the corners of a regular tetrahedron at 109.5°. AX₄

Threshold Energy Chemical Kinetics & Catalysis kJ/mol The minimum total energy that colliding molecules must possess for the collision to be capable of reaction. E_threshold = Ea + E_average

Triglyceride Biochemistry & Polymer Chemistry Dimensionless An ester formed from glycerol and three fatty acid molecules, the main constituent of fats and oils. glycerol + 3 RCOOH

Trigonal Planar Geometry Chemical Bonding & Molecular Structure degrees A flat molecular shape with three bonded atoms arranged around a central atom at 120°. AX₃

Turnover Number Chemical Kinetics & Catalysis s⁻¹ The number of substrate molecules converted per catalytic site per unit time. TON = molecules converted / active sites

Ultraviolet–Visible Spectroscopy Analytical Chemistry & Spectroscopy nm A technique that measures the absorption of ultraviolet and visible light by electronic transitions within molecules. A = log(I₀/I)

Units of the Equilibrium Constant Chemical Equilibrium Various The dimensions carried by an equilibrium constant, determined by the change in the number of moles in the balanced equation. units = (mol/L)^Δn

Van der Waals Equation States of Matter & Gas Laws Various A modified equation of state that corrects the ideal gas law for molecular volume and intermolecular attraction. (p + an²/V²)(V − nb) = nRT

Van der Waals Forces Chemical Bonding & Molecular Structure kJ/mol The collective name for the weak attractive forces between molecules arising from dipole interactions. E ∝ 1 / r⁶

Viscosity States of Matter & Gas Laws Pa·s A liquid's resistance to flow, arising from internal friction between adjacent layers of molecules. F = ηA (dv/dx)

VSEPR Theory Chemical Bonding & Molecular Structure Dimensionless The model that predicts molecular shape by arranging valence electron pairs around a central atom so their mutual repulsion is minimised. AXₘEₙ notation

Water of Crystallisation Foundations of Chemistry mol per mol Water molecules chemically bound within the crystal lattice of a hydrated salt in a fixed stoichiometric ratio.

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

Results for “Mole”