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The hydrostatic pressure produced on the surface of a semipermable membrane by osmosis.

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Intermolecular Forces

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

Half-Life

The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

Cathode

Electrode at which reduction occurs in a cathode ray tube, the negative electrode.

Law of Definite Proportions (Law of Constant Composition)

The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.

Fat

Solid triester of glycerol and (mostly) saturated fatty acids.

Moderator

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

Hybridization

Mixing a set of atomic orbitals to form a new set of atomic orbitals with the same total electron capacity and with properties and energies intermediate between those of the original unhybridized orbitals.

Equilibrium Constant

A quantity that characterizes the position of equilibrium for a reversible reaction, its magnitude is equal to the mass action expression at equilibrium. K varies with temperature.

Condensed States

The solid and liquid states.

Dispersed Phase

The solute-like species in a colloid.