Terms starting with E
81 terms · page 4 of 4
Esterification
Stoichiometry & Chemical Reactions
Dimensionless
The acid-catalysed condensation of a carboxylic acid with an alcohol to form an ester and water.
RCOOH + R′OH ⇌ RCOOR′ + H₂O
Ether
Organic Chemistry
Dimensionless
A compound in which an oxygen atom is bonded to two carbon atoms.
R–O–R′
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.
Excess Reagent
Stoichiometry & Chemical Reactions
mol
A reactant present in a greater amount than is needed to consume the limiting reagent completely.
n_excess = n_initial − n_reacted
Exergonic Reaction
Thermochemistry & Thermodynamics
kJ/mol
A reaction with a negative Gibbs free energy change, which therefore releases usable energy and proceeds spontaneously.
ΔG < 0
Exothermic Reaction
Stoichiometry & Chemical Reactions
kJ/mol
A reaction that releases energy to the surroundings, giving a negative enthalpy change.
ΔH < 0
Expanded Octet
Chemical Bonding & Molecular Structure
Dimensionless
A bonding arrangement in which a central atom is surrounded by more than eight valence electrons.
Extensive Property
Foundations of Chemistry
Various
A property whose value is directly proportional to the quantity of matter in the sample.
Extent of Reaction
Chemical Equilibrium
mol
A single variable measuring how far a reaction has progressed from pure reactants towards products.
ξ = (n_i − n_i°) / ν_i