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Compound in which an oxygen atom is bonded to two alkyl or two aryl groups, or one alkyl and one aryl group.

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Heat of Vaporization

The amount of heat required to vaporize one gram of a liquid at its boiling point with no change in temperature. Usually expressed in J/g. The molar heat of vaporization is the amount of heat required to vaporize one mole of liquid at its boiling point with no change in temperature and usually expressed ion kJ/mol.

Hydrolysis Constant

An equilibrium constant for a hydrolysis reaction.

Hybridization

Mixing a set of atomic orbitals to form a new set of atomic orbitals with the same total electron capacity and with properties and energies intermediate between those of the original unhybridized orbitals.

Heat

A form of energy that flows between two samples of matter because of their differences in temperature.

Homologous Series

A series of compounds in which each member differs from the next by a specific number and kind of atoms.

DP number

The degree of polymerization, the average number of monomer units per polymer unit.

Bubbles

Have you ever noticed that soap bubbles go up in winter and fall down in summer? The reason is that warm air is lighter than cold. And in winter the difference between the air temperature in the room (especially near the windows) and the one you exhale into the bubble is enough to overcome the heaviness of its shell.

Crystal Field Theory

Theory of bonding in transition metal complexes in which ligands and metal ions are treated as point charges, a purely ionic model, ligand point charges represent the crystal (electrical) field perturbing the metal?s d orbitals containing nonbonding electrons.

Heteronuclear

Consisting of different elements.

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.