Search results for “Mole”

Self-Ionisation of Water Acids, Bases & Salts mol/L The reaction in which two water molecules transfer a proton to give a hydronium and a hydroxide ion. 2H₂O ⇌ H₃O⁺ + OH⁻

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

Saturation and Unsaturation Organic Chemistry Dimensionless The distinction between compounds containing only single bonds and those containing multiple bonds or rings. DoU = (2C + 2 + N − H − X)/2

Schrödinger Wave Equation Atomic Structure & Periodicity J The fundamental equation of quantum mechanics whose solutions give the allowed energies and wavefunctions of a system. Ĥψ = Eψ

Second-Order Reaction Chemical Kinetics & Catalysis L/(mol·s) A reaction whose rate depends on the square of one concentration or on the product of two concentrations. 1/[A] = 1/[A]₀ + kt

Secondary Valence Inorganic & Coordination Chemistry Dimensionless In Werner's theory, the non-ionisable valence corresponding to the coordination number, satisfied by ligands in fixed spatial positions.

Selectivity Chemical Kinetics & Catalysis Dimensionless The ability of a catalyst to direct a reaction towards one particular product among several possible ones. selectivity = desired product / total product

SI Base Units Foundations of Chemistry Various The seven defined units of the International System from which every other measurement unit is derived.

Solid State States of Matter & Gas Laws Dimensionless The state of matter in which particles are held in fixed positions, giving a definite shape and volume.

Solubility of Gases Solutions & Colligative Properties mol/L The amount of a gas that dissolves in a given volume of liquid at a stated temperature and partial pressure. S ∝ p, S decreases with T

Solvent Solutions & Colligative Properties L The component of a solution present in the greater amount, which dissolves and disperses the solute.

Specific Heat Capacity Thermochemistry & Thermodynamics J/(kg·K) The heat required to raise the temperature of one kilogram of a substance by one kelvin. c = q / (mΔT)

sp³ Hybridisation Chemical Bonding & Molecular Structure degrees The mixing of one s and three p orbitals to give four hybrid orbitals directed towards the corners of a tetrahedron. 4 hybrids, 109.5°

Steric Factor Chemical Kinetics & Catalysis Dimensionless The fraction of sufficiently energetic collisions that also have the correct spatial orientation for reaction. p = A / Z

Results for “Mole”