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The energy equivalent (E = mc^2) of the mass deficiency of an atom.  where: E = is the energy in joules, m is the mass in kilograms, and c is the speed of light in m/s^2

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Heterogeneous Mixture

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

Fluorescence

Absorption of high energy radiation by a substance and subsequent emission of visible light.

Allotropes

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

Half-Life

The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

Electrophile

Positively charged or electron-deficient.

Denaturation

A process pertaining to a change in structure of a protein form regular to irregular arrangement of the polypeptide chains.

History of fireworks

There is an assumption that the history of fireworks started in China, about 2000 years ago. It is possible that the Chinese accidentally discovered explosions by burning bamboo canes.

Photochemical Smog

A brownish smog occurring in urban areas receiving large amounts of sunlight, caused by photochemical (light-induced) reactions among nitrogen oxides, hydrocarbons and other components of polluted air that produce photochemical oxidants.

 

Raoult's Law

The vapor pressure of a solvent in an ideal solution decreases as its mole fraction decreases.

Alkylbenzene

A compound containing an alkyl group bonded to a benzene ring.