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The total amount of energy in the universe is constant (also known as the Law of Conservation of Energy) energy is neither created nor destroyed in ordinary chemical reactions and physical changes.

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Bonding Pair

Pair of electrons involved in a covalent bond.

S Orbital

A spherically symmetrical atomic orbital, one per energy level.

Activity Series

A listing of metals (and hydrogen) in order of decreasing activity.

Coordination Sphere

The metal ion and its coordinating ligands but not any uncoordinated counter-ions.

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

Law of Conservation of Matter

There is no detectable change in the quantity of matter during an ordinary chemical reaction.

Ternary Acid

A ternary compound containing H, O, and another element, often a nonmetal.

Evaporation Rate

The rate at which a particular substance will vapourize (evaporate) when compared to the rate of a known substance such as ethyl ether. This term is especially useful for health and fire-hazard considerations.

Metallic Conduction

Conduction of electrical current through a metal or along a metallic surface.

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.