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A substance such as hydrogen, deuterium, oxygen or paraffin capable of slowing fast nuetrons upon collision.

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Limiting Reactant

Substance that stoichiometrically limits the amount of product(s) that can be formed.

Standard Reaction

A reaction in which the numbers of moles of reactants shown in the balanced equation, all in their standard states, are completely converted to the numbers of moles of products shown in the balanced equation, also sall at their standard state.

Excited State

Any state other than the ground state of an atom or molecule.

Nuclides

Refers to different atomic forms of all elements in contrast to ?isotopes?, which refer only to different atomic forms of a single element.

Hydrolysis

The reaction of a substance with water or its ions.

Heterogeneous Equilibria

Equilibria involving species in more than one phase.

Concentration

Amount of solute per unit volume or mass of solvent or of solution.

Geiger counter

A gas filled tube which discharges electriaclly when ionizing radiation passes through it.

Chemical Hygiene Plan (CHP)

A written program developed and implemented by an employer designating proceedures, equipment, personal protective equipment, and work practices that are capable of protecting employees from the health hazards presented by hazardous chemicals usid in that particular workplace.

Fractional Precipitation

Removal of some ions from solution by precipitation while leaving other ions with similar properties in solution.