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Foundations of Chemistry

Standard Temperature and Pressure

A defined reference condition used to report and compare gas measurements, currently 0 °C and 100 kPa under IUPAC.

T = 273.15 K, p = 100 kPa K, kPa
Analytical Chemistry & Spectroscopy

Standardisation

The determination of the exact concentration of a solution by titrating it against a primary standard.

M₁V₁ / n₁ = M₂V₂ / n₂ mol/L
Biochemistry & Polymer Chemistry

Starch

The storage polysaccharide of plants, consisting of amylose and amylopectin.

(C₆H₁₀O₅)ₙ Dimensionless
Thermochemistry & Thermodynamics

State Function

A property whose value depends only on the current state of the system, not on how that state was reached.

ΔX = X_final − X_initial Various
Chemical Equilibrium

Static Equilibrium

A state of no change in which the opposing processes have genuinely ceased rather than balancing.

Dimensionless
Analytical Chemistry & Spectroscopy

Stationary Phase

The fixed material in a chromatographic system with which the sample components interact as they pass.

Dimensionless
Chemical Kinetics & Catalysis

Steady-State Approximation

The assumption that the concentration of a reactive intermediate stays essentially constant because it is consumed as fast as it is formed.

d[intermediate]/dt ≈ 0 mol/L
Chemical Equilibrium

Stepwise Formation Constant

The equilibrium constant for the addition of one further ligand to a partially formed complex.

K₁, K₂, K₃ … Various
Acids, Bases & Salts

Stepwise Ionisation

The successive loss of protons from a polyprotic acid, each governed by its own equilibrium constant.

Ka₁ ≫ Ka₂ ≫ Ka₃ mol/L
Organic Chemistry

Stereoisomerism

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

Dimensionless
Chemical Kinetics & Catalysis

Steric Factor

The fraction of sufficiently energetic collisions that also have the correct spatial orientation for reaction.

p = A / Z Dimensionless
Biochemistry & Polymer Chemistry

Steroid

A lipid built on a characteristic framework of three six-membered rings fused to one five-membered ring.

C₁₇ tetracyclic core Dimensionless
Solutions & Colligative Properties

Stock Solution

A concentrated solution prepared in advance and stored for later dilution to working strength.

mol/L
Stoichiometry & Chemical Reactions

Stoichiometric Coefficient

The number written before a formula in a balanced equation, giving the relative amount of that substance consumed or produced.

Dimensionless
Stoichiometry & Chemical Reactions

Stoichiometric Mixture

A mixture of reactants present in exactly the proportions required by the balanced equation, with no reactant in excess.

n_A : n_B = a : b mol
Stoichiometry & Chemical Reactions

Stoichiometry

The quantitative study of the mass and mole relationships between reactants and products in a chemical reaction.

n_A / a = n_B / b mol
Acids, Bases & Salts

Strong Acid

An acid that ionises essentially completely in aqueous solution.

HA → H⁺ + A⁻ (complete) mol/L
Acids, Bases & Salts

Strong Base

A base that dissociates or ionises completely in aqueous solution to give hydroxide ions.

BOH → B⁺ + OH⁻ mol/L
Inorganic & Coordination Chemistry

Strong Field Ligand

A ligand that produces a large crystal field splitting, favouring electron pairing over occupation of upper orbitals.

Δ > P cm⁻¹
Nuclear & Radiochemistry

Strong Nuclear Force

The short-range attractive force that binds protons and neutrons together within the nucleus.

N
Foundations of Chemistry

Structural Formula

A representation showing how the atoms in a molecule are connected and, often, how they are arranged in space.

Dimensionless
Organic Chemistry

Structural Isomerism

Isomerism in which the compounds differ in the order in which their atoms are connected.

Dimensionless
States of Matter & Gas Laws

Sublimation

The direct conversion of a solid into a vapour without passing through the liquid state.

ΔH_sub = ΔH_fus + ΔH_vap kJ/mol
Stoichiometry & Chemical Reactions

Substitution Reaction

A reaction in which one atom or group in a molecule is replaced by another.

R–X + Y → R–Y + X Dimensionless