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A compound consisting of two elements, may be ionic or covalent.

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Secondary Voltaic Cells

Voltaic cells that can be recharged, original reactanats can be regenerated be reversing the direction of the current flow.

Semiconductor

A substance that does not conduct electricity at low temperatures but does so at higher temperatures.

Gel

Colloidal suspension of a solid dispersed in a liquid, a semirigid solid.

Semipermable Membrane

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

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Electrochemistry

Study of chemical changes produced by electrical current and the production of electricity by chemical reactions.

Isoelectric

Having the same electronic configurations.

Autoionization

An ionization reaction between identical molecules.

Alkylbenzene

A compound containing an alkyl group bonded to a benzene ring.

Basic Anhydride

The oxide of a metal that reacts with water to form a base.

Atomic Orbital

Region or volume in space in which the probability of finding electrons is highest.

Reducing Agent

The substance that reduces another substance and is oxidized.

Ionic Compounds

Compounds containing predominantly ionic bonding.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Allotropes

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

Ideal Gas Law

The product of pressure and the volume of an ideal gas is directly proportional to the number of moles of the gas and the absolute temperature.

Fatty Acids

An aliphatic acid, many can obtained from animal fats.

Shielding Effect

Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus, also called screening effect.

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Explosive

A chemical or compound that causes a sudden, almost instantaneous release or pressure, gas, heat and light when subjected to sudden shock, pressure, high temperature or applied potential.