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The reaction in which hydrogen adds across a double or triple bond.

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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.

 

Absolute Entropy (of a substance)

The increase in the entropy of a substance as it goes from a perfectly ordered crystalline form at 0 °K (where its entropy is zero) to the temperature in question.

Entropy is a measure of the “dilution” of thermal energy.

Molecular Geometry

The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.

Lewis Acid

Any species that can accept a share in an electron pair.

Amino Acid

Compound containing both an amino and a carboxylic acid group.The --NH2 group.

Isomers

Different substances that have the same formula.

Collision Theory

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

London Forces

Very weak and very short-range attractive forces between short-lived temporary (induced) dipoles, also called dispersion Forces.

Nonpolar Bond

Covalent bond in which electron density is symmetrically distributed.

Chemical Change

A change in which one or more new substances are formed.