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The mass action expression under any set of conditions (not necessarily equlibrium), its magnitude relative to K determines the direction in which the reaction must occur to establish equilibrium.

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Barometer

A device for measuring pressure.

Formula Unit

The smallest repeating unit of a substance. The molecule for nonionic substances

Specific Rate Constant

An experimentally determined (proportionality) constant, which is different for different reactions and which changes only with temperature, k in the rate-law expression: Rate = k [A] x [B]v.

Electron

A subatomic particle having a mass of 0.00054858 amu and a charge of 1-.

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.

Intermolecular Forces

Forces between individual particles (atoms, molecules, ions) of a substance.

Ligand

A Lewis base in a coordination compound.

Phosphoric Acid

H3P04, Colorless liquid or rhombic crystals, decomposes before it will boil. Used mostly in the metal etchant. Used in cleaning operations to remove encrusted surface matter and mineral scale found on metal equipment such as boilers and steam producing equipment. Also used to brighten metals and remove rust.

Hydrogenation

The reaction in which hydrogen adds across a double or triple bond.

Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.