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

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Hydrolysis Constant

An equilibrium constant for a hydrolysis reaction.

Condensed Phases

The liquid and solid phases, phases in which particles interact strongly.

Complex Ions

Ions resulting from the formation of coordinate covalent bonds between simple ions and other ions or molecules.

Covalent Compounds

Compounds containing predominantly covalent bonds.

Percent Purity

The percent of a specified compound or element in an impure sample.

Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

Endothermic

Describes processes that absorb heat energy.

Safranine

Also called "phenosafranine". A purplish-red, water-soluble dye, C18H14N4, used for textiles and as a stain in microscopy.

Mass Number

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

Hydrometer

A device used to measure the densities of liquids and solutions.