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Pair of electrons involved in a covalent bond.

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Formula

Combination of symbols that indicates the chemical composition of a substance.

 

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Essential Oil

A plant extract that has a distinctive odour or flavour.

Percentage Ionization

The percentage of the weak electrolyte that ionizes in a solution of given concentration.

Heat of Crystallization

The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature.

Hydrate Isomers

Isomers of crystalline complexes that differ in whether water is present inside or outside the coordination sphere.

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.

Heterocyclic Amine

Amine in which the nitrogen is part of a ring.

Nonelectrolyte

A substance whose aqueous solutions do not conduct electricity.

Dosimeter

A small, calibrated electroscope worn by laboratory personnel and designated to detect and measure incident ionizing radiation or chemical exposure.