Search results for “Mole”

Effusion States of Matter & Gas Laws mol/s The escape of gas molecules one at a time through a hole much smaller than the mean free path. rate ∝ 1 / √M

Electron Affinity Atomic Structure & Periodicity kJ/mol The energy change when one mole of gaseous atoms each gains an electron to form gaseous negative ions. X(g) + e⁻ → X⁻(g)

Enthalpy of Atomisation Thermochemistry & Thermodynamics kJ/mol The enthalpy change when one mole of gaseous atoms is produced from an element in its standard state. ΔH_at°

Enthalpy of Fusion Thermochemistry & Thermodynamics kJ/mol The enthalpy change when one mole of a solid melts to a liquid at its melting point. ΔH_fus

Enthalpy of Neutralisation Thermochemistry & Thermodynamics kJ/mol The enthalpy change when an acid and a base react to form one mole of water under standard conditions. H⁺ + OH⁻ → H₂O, ΔH = −57.1 kJ

Enthalpy of Solution Solutions & Colligative Properties kJ/mol The heat absorbed or released when one mole of a substance dissolves completely in a large excess of solvent. ΔH_sol = ΔH_lattice + ΔH_hyd

Enthalpy of Sublimation Thermochemistry & Thermodynamics kJ/mol The enthalpy change when one mole of a solid converts directly into vapour. ΔH_sub = ΔH_fus + ΔH_vap

Enthalpy of Vaporisation Thermochemistry & Thermodynamics kJ/mol The enthalpy change when one mole of a liquid becomes vapour at its boiling point. ΔH_vap

Enzyme Catalysis Chemical Kinetics & Catalysis Dimensionless Catalysis by protein molecules that bind substrates at a specific active site and lower the activation energy dramatically.

Equivalent Weight Stoichiometry & Chemical Reactions g/equiv The mass of a substance that combines with or displaces 1.008 g of hydrogen, 8 g of oxygen or one mole of electrons. E = M / n-factor

Evaporation States of Matter & Gas Laws kJ/mol The escape of molecules from the surface of a liquid into the vapour phase below the boiling point.

Effect of an Inert Gas Chemical Equilibrium Pa The influence of adding a non-reacting gas on the position of a gaseous equilibrium.

Effect of Pressure Change Chemical Equilibrium Pa The shift in a gaseous equilibrium caused by changing the total pressure through a volume change. shift towards fewer gas moles when p rises

Electron Domain Geometry Chemical Bonding & Molecular Structure degrees The spatial arrangement of all electron domains — bonding and lone pairs alike — around a central atom.

Electrophile Organic Chemistry Dimensionless An electron-deficient species that seeks and accepts a pair of electrons from an electron-rich centre. E⁺

Electrophoresis Analytical Chemistry & Spectroscopy cm/s A separation technique in which charged species migrate through a medium under an applied electric field. v = μE

Elementary Reaction Chemical Kinetics & Catalysis Dimensionless A reaction that occurs in a single step exactly as written, with no detectable intermediate. order = molecularity

Empirical Formula Foundations of Chemistry Dimensionless The chemical formula giving the simplest whole-number ratio of atoms of each element in a compound. ratio = (mass % ÷ A_r), normalised

Entropy Thermochemistry & Thermodynamics J/(mol·K) A measure of the dispersal of energy and the number of microscopic arrangements available to a system. S = k ln W

Enthalpy of Reaction Thermochemistry & Thermodynamics kJ/mol 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)

Extensive Property Foundations of Chemistry Various A property whose value is directly proportional to the quantity of matter in the sample.

Results for “Mole”