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The mass percent of each element in a compound.

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Hess' Law of Heat Summation

The enthalpy change for a reaction is the same whether it occurs in one step or a series of steps.

Halogens

Group VIIA elements: F, Cl, Br, I

Standard Electrode Potential

By convention, potential, Eo, of a half-reaction as a reduction relative to the standard hydrogen electrode when all species are present at unit activity.

 

Geiger counter

A gas filled tube which discharges electriaclly when ionizing radiation passes through it.

Polyprotic Acid

An Acid that can form two or more hydronium ions per molecule, often a least one step of ionization is weak.

Half-Reaction

Either the oxidation part or the reduction part of a redox reaction.

Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

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.

Contact Process

Industrial process by which sulfur trioxide and sulfuric acid are produced from sulfur dioxide.

Quantum Numbers

Numbers that describe the energies of electrons in atoms, derived from quantum mechanical treatment.