AskDefine | Define halide

Dictionary Definition

halide n : a salt of any halogen acid

User Contributed Dictionary

English

Etymology

See halogen.

Noun

  1. A salt of any halogen acid.
    Potassium iodide is a halide.

Derived terms

Translations

halogen salt

Extensive Definition

A halide is a binary compound, of which one part is a halogen atom and the other part is an element or radical that is less electronegative than the halogen, to make a fluoride, chloride, bromide, iodide, or astatide compound. Many salts are halides. All Group 1 metals form halides with the halogens and they are white solids.
A halide ion is a halogen atom bearing a negative charge. The halide anions are fluoride (F−), chloride (Cl−), bromide (Br−), iodide (I−) and astatide (At−). Such ions are present in all ionic halide salts.

Halides in organic chemistry

In organic chemistry halides represent a functional group. Any organic compound that contains a halogen atom can be considered a halide. Alkyl halides are organic compounds of the type R-X, containing an alkyl group R covalently bonded to a halogen X.
Pseudohalides resemble halides in their charge and reactivity; common examples are azides NNN-, isocyanate -NCO, Isocyanide, CN-, etc.
A chemical test for the detection of halogen in chemical substances is the Carius halogen method.
Dihalides are commonly used in the synthesis of cyclic alkanes.

Test for Halide ions

Halide compounds such as KCl, KBr and KI can be tested with silver nitrate solution, AgNO3. The halogen will react with Ag+ and form a precipitate, with colour as follow: AgF - Yellowish Brown AgCl - White AgBr - Creamy (Pale Yellow) AgI - Yellow

Halides in lighting

Metal halides are used in high-intensity discharge lamps called metal halide lamps, such as those used in modern street lights. These are more energy-efficient than mercury-vapor lamps, and have much better colour rendition than orange high-pressure sodium lamps. Metal halide lamps are also commonly used in greenhouses or in rainy climates to supplement natural sunlight.
HID (High-intensity discharge) lamps however, contribute highly to light pollution. Sodium-vapor are favored for this reason.

Halide compounds

Examples of halide compounds are:

References

halide in Bosnian: Halidi
halide in Catalan: Halur
halide in Danish: Halogenid
halide in German: Halogenide
halide in Spanish: Haluro
halide in Esperanto: Halogenido
halide in Basque: Haluro
halide in French: Halogénure
halide in Italian: Alogenuro
halide in Macedonian: Халид
halide in Dutch: Halogeniden
halide in Japanese: ハロゲン化合物
halide in Polish: Halogenki
halide in Russian: Галогенид
halide in Slovak: Halogenid
halide in Finnish: Halidi
halide in Swedish: Halogenider
halide in Chinese: 卤化物
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