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Compound in which a carbonyl group is bound to two alkyl or two aryl groups, or to one alkyl and one aryl group.

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Atomic Radius

Radius of an atom.

Hess' Law of Heat Summation

The enthalpy change for a reaction is the same whether it occurs in one step or a series of steps.

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Anode

In a cathode ray tube, the positive electrode. Electrode at which oxidation occurs.

Adsorption

Adhesion of a species onto the surfaces of particles.

Hydride

A binary compound of hydrogen.

 

Linkage Isomers

Isomers in which a particular ligand bonds to a metal ion through different donor atoms.

 

Evaporation Rate

The rate at which a particular substance will vapourize (evaporate) when compared to the rate of a known substance such as ethyl ether. This term is especially useful for health and fire-hazard considerations.

Law of Combining Volumes (Gay-Lussac's Law)

At constant temperature and pressure, the volumes of reacting gases (and any gaseous products) can be expressed as ratios of small whole numbers.

 

Reverse Osmosis

Forcing solvent molecules to flow through a semipermable membrane from a concentated solution into a dilute solution by the application of greater hydrostatic pressure on concentrated side than the osmotic pressure opposing it.