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Equilibria involving only one species in a single phase. For example, all gases, all liquids or all solids.

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Shielding Effect

Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus, also called screening effect.

Heterogeneous Catalyst

A catalyst that exists in a different phase (solid, liquid or gas) from the reactants, a contact catalyst.

Mass Number

The sum of the numbers of protons and neutrons in an atom, an integer.

Coefficient of expansion

The ratio of the change in length or volumen of a body to the original lengthor volume for a unit change in temperature.

Geometrical Isomers

Compounds with different arrangements of groups on either side of a bond with restricted rotation, such as a double bond or a single bond in a ring, for example cis-trans isomers of certain alkenes. Stereoisomers that are not mirror images of each other, also known as position isomers.

Chemical Hygiene Officer (CHO)

A person or employee who is qualified by training or experience to provide technical guidance in the development and implementations of the provisions of a Chemical Hygiene Plan (CHP)

Partial Pressure

The pressure exerted by one gas in a mixture of gases.

Specific Gravity

The ratio of the density of a substance to the density of water.

Electrical Conductivity

Ability to conduct electricity.

Linkage Isomers

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