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A thin partition between two solutions through which certain molecules can pass but others cannot.

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Clay

A class of silicate and aluminosilicate minerals with sheet-like structures that have enormous surface areas that can absorb large amounts of water.

Hydrocarbons

Compounds that contain only carbon and hydrogen.

Corrosion

Oxidation of metals in the presence of air and moisture.

Composition Stoichiometry

Descibes the quantitative (mass) relationships among elements in compounds.

Specific Heat

The amount of heat required to raise the temperature of one gram of substance one degree Celsius.

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.

Alpha Particles

A helium nucleus.

Endothermic

Describes processes that absorb heat energy.

London Forces

Very weak and very short-range attractive forces between short-lived temporary (induced) dipoles, also called dispersion Forces.

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.