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The Chemical Glossary currently has 651 chemical entries. You may search the Chemical Glossary by entering the keyword in the search box or by browsing the entire chemical glossary by letter in alphabetical order.

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Lewis Acid

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

Miscibility

The ability of one liquid to mix with (dissolve in) another liquid.

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.

 

Heat of Crystallization

The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature.

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.

Hydrogen-Oxygen Fuel Cell

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

 

Percent Purity

The percent of a specified compound or element in an impure sample.

Bronsted-Lowry Acid

A proton donor.

Polymerization

The combination of many small molecules to form large molecules.

Faraday's Law of Electrolysis

One equivalent weight of a substance is produced at each electrode during the passage of 96,487 coulombs of charge through an electrolytic cell.

Endothermicity

The absorption of heat by a system as the process occurs.

Mole Fraction

The number of moles of a component of a mixture divided by the total number of moles in the mixture.

 

Eluant or eluent

The solvent used in the process of elution, as in liquid chromatography.

 

Law of Partial Pressures (Dalton's Law)

The total pressure exerted by a mixture of gases is the sum of the partial pressures of the individual gases.

Adhesive Forces

Forces of attraction between a liquid and another surface.

Cis-Trans Isomerism

A type of geometrical isomerism related to the angles between like ligands.

Boiling Point Elevation

The increase in the boiling point of a solvent caused by the dissolution of a nonvolatile solute.

xylan

The pentosan occurring in woody tissue that hydrolyzes to xylose: used as a source of furfural.

Nitrogenases

A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

Homogeneous Catalyst

A catalyst that exists in the same phase (solid, liquid or gas) as the reactants. The process is called Homogeneous Catalysis.