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Results for “Mole”

256 terms · page 11 of 11


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Biochemistry & Polymer Chemistry

Thermoplastic

A polymer that softens on heating and hardens again on cooling, reversibly and repeatedly.

°C
Chemical Bonding & Molecular Structure

Three-Centre Two-Electron Bond

A bond in which a single pair of electrons is shared between three atoms rather than two.

A···H···B kJ/mol
States of Matter & Gas Laws

Vapour Pressure

The pressure exerted by a vapour in dynamic equilibrium with its liquid or solid at a given temperature.

ln p = −ΔH_vap / RT + C Pa
Acids, Bases & Salts

Weak Acid

An acid that ionises only partially in aqueous solution, establishing an equilibrium with its conjugate base.

HA ⇌ H⁺ + A⁻ mol/L
Solutions & Colligative Properties

Colligative Properties

Solution properties that depend only on the number of dissolved solute particles, not on their chemical identity.

Various
Biochemistry & Polymer Chemistry

Degree of Polymerisation

The number of monomer units in an average polymer chain.

DP = M_polymer / M_monomer Dimensionless
Foundations of Chemistry

Dimensional Analysis

A calculation method that tracks and cancels units through a chain of conversion factors to reach the required quantity.

given quantity × (desired unit / given unit) = answer Various
Thermochemistry & Thermodynamics

Enthalpy of Reaction

The heat absorbed or released when a reaction occurs at constant pressure in the molar amounts of the balanced equation.

ΔH_rxn = ΣΔH_f(products) − ΣΔH_f(reactants) kJ/mol
Foundations of Chemistry

Extensive Property

A property whose value is directly proportional to the quantity of matter in the sample.

Various
Atomic Structure & Periodicity

Group

A vertical column of the periodic table whose members share the same valence electron configuration.

Dimensionless
States of Matter & Gas Laws

Ideal Gas Law

The equation of state relating the pressure, volume, amount and absolute temperature of an ideal gas.

pV = nRT Various
Chemical Equilibrium

Le Chatelier's Principle

When a system at equilibrium is disturbed, it responds in the direction that partially opposes the disturbance.

Dimensionless
Acids, Bases & Salts

Lewis Theory

The theory defining an acid as an electron pair acceptor and a base as an electron pair donor.

A + :B → A←B Dimensionless
Organic Chemistry

Organic Chemistry

The study of the structure, properties, composition and reactions of carbon-containing compounds.

Dimensionless
Chemical Kinetics & Catalysis

Pre-exponential Factor

The constant A in the Arrhenius equation, representing the frequency of appropriately oriented collisions.

A = pZ Various
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