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One of the two mirror-image forms of an optically active molecule.

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Mole Fraction

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

 

Photon

A packet of light or electromagnetic radiation, also called quantum of light.

 

Electron Affinity

The amount of energy absorbed in the process in which an electron is added to a neutral isolated gaseous atom to form a gaseous ion with a 1- charge, has a negative value if energy is released.

Saturated Solution

Solution in which no more solute will dissolve.

Excited State

Any state other than the ground state of an atom or molecule.

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.

 

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.

Bomb Calorimeter

A device used to measure the heat transfer between system and surroundings at constant volume.

Mixture

A sample of matter composed of two or more substances, each of which retains its identity and properties.

Conduction Band

A partially filled band or a band of vacant energy levels just higher in energy than a filled band, a band within which, or into which, electrons must be promoted to allow electrical conduction to occur in a solid.