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Refers to the separation of charge between two covalently bonded atoms.

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Spectator Ions

Ions in a solution that do not participate in a chemical reaction.

Allotropes

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

Heat of Fusion

The amount of heat required to melt one gram of solid at its melting point with no change in temperature. Usually expressed in J/g. The molar heat of fusion is the amount of heat required to melt one mole of a solid at its melting point with no change in temperature and is usually expressed in kJ/mol.

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.

Extrapolate

To estimate the value of a result outside the range of a series of known values. Technique used in standard additions calibration procedure.

Hard Water

Water containing Fe3+, Ca2+, and Mg2+ ions, which forms precipates with soap.

Hydrogen-Oxygen Fuel Cell

Fuel cell in which hydrogen is the fuel (reducing agent) and oxygen is the oxidizing agent.

 

Particulate Matter

Fine divided solid particles suspended in polluted air.

Fatty Acids

An aliphatic acid, many can obtained from animal fats.

Neutron

A neutral subatomic particle having a mass of 1.0087 amu.