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A Lewis base in a coordination compound.

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Reactants

Substances consumed in a chemical reaction.

Catalyst

A substance that speeds up a chemical reaction without being consumed itself in the reaction.
A substance that alters (usually increases) the rate at which a reaction occurs.

Dynamic Equilibrium

An equilibrium in which processes occur continuously, with no net change. When two (or more) processes occur at the same rate so that no net change occurs.

Solution

Homogeneous mixture of two or more substances.

Polarimeter

A device used to measure optical activity.

Law of Partial Pressures (Dalton's Law)

The total pressure exerted by a mixture of gases is the sum of the partial pressures of the individual gases.

Percentage Ionization

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

Alkali Metals

Metals of Group IA (Na, K, Rb).

Bronsted-Lowry Base

A proton acceptor

Amphoterism

The ability to react with both acids and bases.Ability of substance to act as either an acid or a base.