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Decomposition by heating a substance in the presence of a catalyst and in the absence of air.

 

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Condensed States

The solid and liquid states.

Chemical Kinetics

The study of rates and mechanisms of chemical reactions and of the factors on which they depend.

Derivative

A compound that can be imagined to arise from a partent compound by replacement of one atom with another atom or group of atoms. Used extensively in orgainic chemistry to assist in identifying compounds.

Collision Theory

Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.

Explosive limits

The range of concentrations over which a flammable vapour mixed with proper ratios of air will ignite or explode if a source of ignitions is provided.

Radiation

High energy particles or rays emitted during the nuclear decay processes.

Valence Shell Electron Pair Repulsion Theory

Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.

 

Henry's Law

The pressure of the gas above a solution is proportional to the concentration of the gas in the solution.

Metal

An element below and to the left of the stepwise division (metalloids) in the upper right corner of the periodic table, about 80% of the known elements are metals.

Chain Termination Step

The combination of two radicals, which removes the reactive species that propagate the change reaction.