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The pressure exerted by one gas in a mixture of gases.

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Molecular Equation

Equation for a chemical reaction in which all formulas are written as if all substances existed as molecules, only complete formulas are used.

Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.

Catalyst

A substance that speeds up a chemical reaction without being consumed itself in the reaction.
A substance that alters (usually increases) the rate at which a reaction occurs.

ytterbia

Ytterbia is a colorless compound, Yb2O3, used in certain alloys and ceramics. Also known as ytterbium oxide.

Nucleons

Particles comprising the nucleus, protons and neutrons.

Polarimeter

A device used to measure optical activity.

Acetic Acid

CA3COOH, clear, colorless liquid, pungent odor. Boiling point 140C, flash point 54C (closed cup), autoignition temperature 38OC.

Octane Number

A number that indicates how smoothly a gasoline burns.

Heterogeneous Mixture

A mixture that does not have uniform composition and properties throughout.

Water Equivalent

The amount of water that would absorb the same amount of heat as the calorimeter per degree temperature increase.