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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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Dispersing Medium

The solvent-like phase in a colloid.

Band of Stability

Band containing nonradioactive nuclides in a plot of number of neutrons versus atomic number.

Isoelectric

Having the same electronic configurations.

Paramagnetism

Attraction toward a magnetic field, stronger than diamagnetism, but still weak compared to ferromagnetism.

Total Ionic Equation

Equation for a chemical reaction written to show the predominant form of all species in aqueous solution or in contact with water.

Acid

A substance that produces H+(aq) ions in aqueous solution. Strong acids ionize completely or almost completely in dilute aqueous solution. Weak acids ionize only slightly. Chemicals or substances having the property of an acid are said to be acidic.

Voltage

Potential difference between two electrodes, a measure of the chemical potential for a redox reaction to occur.

Nonbonding Orbital

A molecular orbital derived only from an atomic orbital of one atom, lends neither stability nor instability to a molecule or ion when populated with electrons.

Ion

An atom or a group of atoms that carries an electric charge.

Base

A substance that produces OH (aq) ions in aqueous solution. Strong soluable bases are soluble in water and are completely dissociated. Weak bases ionize only slightly.