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

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Aromatic Hydrocarbons

Benzene and its derivatives.

Vapor

A gas formed by boiling or evaporating a liquid.

Covalent Compounds

Compounds containing predominantly covalent bonds.

Law of Combining Volumes (Gay-Lussac's Law)

At constant temperature and pressure, the volumes of reacting gases (and any gaseous products) can be expressed as ratios of small whole numbers.

 

Alkyl Group

A group of atoms derived from an alkane by the removal of one hydrogen atom.

Sublimation

The direct vaporization of a sold by heating without passing through the liquid state.

Nuclear Fission

The process in which a heavy nucleus splits into nuclei of intermediate masses and one or more protons are emitted.

Le Chatelier's Principle

States that a system at equilibrium, or striving to attain equilibrium, responds in such a way as to counteract any stress placed upon it.
If a stress (change of conditions) is applied to a system at equilibrium, the system shifts in the direction that reduces stress.

Equilibrium or Chemical Equilibrium

A state of dynamic balance in which the rates of forward and reverse reactions are equal, the state of a system when neither forward or reverse reaction is thermodynamically favored.

Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.