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A colorless, crystalline compound, XeF4, prepared by heating a gaseous mixture of fluorine and xenon.

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Coordination Sphere

The metal ion and its coordinating ligands but not any uncoordinated counter-ions.

Critical Point

The combination of critical temperature and critical pressure of a substance.

Aromatic Hydrocarbons

Benzene and its derivatives.

Saccharic

of or derived from saccharin or a saccharine substance.

 

Cathode Ray Tube

Closed glass tube containing a gas under low pressure, with electrodes near the ends and a luminescent screen at the end near the positive electrode, produces cathode rays when high voltage is applied.

Chemical Equation

Description of a chemical reaction by placing the formulas of the reactants on the left and the formulas of products on the right of an arrow.

Frequency

The number of repeating corresponding points on a wave that pass a given observation point per unit time.

Exothermic

Describes processes that release heat energy.

Coulomb

Unit of electrical charge.

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.