Search results for “Mole”

Mole Foundations of Chemistry mol The SI base unit for amount of substance, containing exactly 6.02214076 × 10²³ elementary entities. n = m / M

Mole Fraction Solutions & Colligative Properties Dimensionless The ratio of the moles of one component to the total moles of all components in a mixture. x_A = n_A / n_total

Mole Fraction Equilibrium Constant Chemical Equilibrium Dimensionless The equilibrium constant written in terms of the mole fractions of the reacting gases. Kx = Kp × p^(−Δn)

Mole Ratio Stoichiometry & Chemical Reactions Dimensionless The proportion between the amounts of any two substances in a reaction, taken directly from the balanced equation's coefficients. n_A : n_B = a : b

Molecular Equation Stoichiometry & Chemical Reactions Dimensionless A chemical equation in which all reactants and products are written as complete, undissociated formulae. AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq)

Molecular Formula Foundations of Chemistry Dimensionless The formula stating the actual number of atoms of each element present in one molecule of a compound. molecular formula = n × empirical formula

Molecular Geometry Chemical Bonding & Molecular Structure degrees The three-dimensional arrangement of the bonded atoms in a molecule, ignoring the positions of lone pairs.

Molecular Ion Peak Analytical Chemistry & Spectroscopy Da The peak in a mass spectrum corresponding to the intact molecule after loss of a single electron. M⁺·

Molecular Mass Foundations of Chemistry Dimensionless The sum of the relative atomic masses of all atoms shown in a molecular formula. M_r = Σ A_r (all atoms)

Molecular Orbital Theory Chemical Bonding & Molecular Structure Dimensionless The bonding model in which atomic orbitals combine to form molecular orbitals delocalised over the entire molecule. ψ_MO = c₁ψ_A ± c₂ψ_B

Molecularity Chemical Kinetics & Catalysis Dimensionless The number of reacting species that collide simultaneously in a single elementary step.

Molecule Foundations of Chemistry Dimensionless An electrically neutral group of two or more atoms held together by covalent bonds, acting as the smallest unit of a covalent substance.

Acid Strength and Molecular Structure Acids, Bases & Salts Dimensionless The structural factors that determine how readily a molecule releases a proton.

Antibonding Molecular Orbital Chemical Bonding & Molecular Structure Dimensionless A molecular orbital higher in energy than its parent atomic orbitals, whose occupation destabilises the molecule. ψ* = ψ_A − ψ_B

Bimolecular Reaction Chemical Kinetics & Catalysis L/(mol·s) An elementary step in which two species collide and react. A + B → products, rate = k[A][B]

Biomolecule Biochemistry & Polymer Chemistry Dimensionless An organic molecule produced by and essential to a living organism.

Bonding Molecular Orbital Chemical Bonding & Molecular Structure Dimensionless A molecular orbital lower in energy than the atomic orbitals from which it forms, whose occupation stabilises the molecule. ψ = ψ_A + ψ_B

Intermolecular Forces Chemical Bonding & Molecular Structure kJ/mol The comparatively weak attractions acting between separate molecules rather than within them.

Kinetic Molecular Theory States of Matter & Gas Laws Dimensionless The model that explains gas behaviour in terms of large numbers of tiny particles in constant random motion. pV = ⅓ Nmc̄²

Odd-Electron Molecule Chemical Bonding & Molecular Structure Dimensionless A species containing an unpaired electron, so that its total electron count is odd and no octet structure is possible.

Termolecular Reaction Chemical Kinetics & Catalysis L²/(mol²·s) An elementary step requiring the simultaneous collision of three species. rate = k[A][B][C]

Unimolecular Reaction Chemical Kinetics & Catalysis s⁻¹ An elementary step in which a single molecule rearranges or decomposes. A → products, rate = k[A]

Active Site Chemical Kinetics & Catalysis Dimensionless The specific region of a catalyst or enzyme at which the reacting molecules bind and are transformed.

Addition Reaction Stoichiometry & Chemical Reactions Dimensionless A reaction in which two molecules combine to form a single larger product, with no atoms left over. A + B → AB

Results for “Mole”