أكاديميا - كولنز - معاجم الجيب العلمية - الكيمياء - انكليزي - فرنسي - عربي الحرف ٦_ s

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sulphates
sulphates mpl

sulfate. These compounds contain the SOZ2/4- ion (valency = 2). They are widespread compounds in nature, such as gypsum, CaSO4, and these compounds can be produced in the laboratory through the action of sulfuric acid in metals, oxides, or hydroxides.

like :

Zn + H₂SO₄ → ZnSO4 + H2
(gas) (aqueous) (aqueous) (solid)

CuO + H2SO4 → CuSO4 + H2O
(liquid) (aqueous) (aqueous) (solid)

Sulfates are detected by adding a solution to an acidic solution (HCI) of barium chloride. So if it is
Sulphates present form a white precipitate:

BaCl2 + SO2-/4 → BaSO4 + 2CI
(aqueous) (solid) (aqueous) (aqueous)

This precipitate is insoluble in dilute acid.


sulphides
sulfures mpl

Sulfides are compounds of sulfur with another element produced by reaction with sulfur or hydrogen sulphide:

(solid)FeS - (solid)S + (solid)Fe

CuSO4 + H2S → CuS + H2SO4
(aqueous) (solid) (gas) (aqueous)


sulphites
sulphites mpl

Sulphites. These compounds contain the ion SO2/3 and can be considered salts of sulphurous acid H2SO3.
Sulfur (IV) oxide is prepared in the laboratory by the action of acid in sulfide.


sugar
sugar m

sugar . A common generic name for sweet compounds that are monosaccharides or disaccharides in their chemical structure. Examples include: glucose, sucrose, fructose, and maltose.
See carbohydrate.


sulfur(Sa)
soufre m

matchsticks. A yellow, non-metallic element that exists in two isoforms. Rhombic sulfur is the stable formula below 96°C, while monoclinic sulfur is the stable formula above that temperature. The numbers in the following figure represent the monoclinic allotrope.

Sulfur is an element in Group VI of the periodic table, and it is reactive toward metals and oxygen. It is found free in nature and is also found in the form of mineral sulfides such as galena (PbS) and pyrite. (FeS)

Sulfur-containing is also found in petroleum and natural gas. Sulfur is an important component of some medicines, such as sulfone amide, but its main use is in the manufacture of sulfuric acid through the contact process.
See vulcanizing.

sulfur compounds
Compositions for the soufre

Sulfur compounds.

Sulfur oxide SO2 (IV)

Its common name is sulfur dioxide, and it is a colorless gas with a pungent odor. It is produced by burning sulfur or its compounds in air or oxygen. Sulfur oxide dissolves in water to form sulfurous acid, which is a weak acid. The oxide is useful as a sterilizing agent and is often added to moisturizers. Sulfur oxide is a reducing agent, and this property is used in chemical testing of gas. The oxide converts the dichromate (VI) moiety (orange) into a chromium (III) moiety (green). Sulfur dioxide is one of the most important air pollutants and causes of acid rain resulting from the burning of fossil fuels.

Sulfur oxide (VI) SO3

A solid, volatile substance with a pungent odor. It is produced in the contact process by combining sulfur dioxide and oxygen above
catalyst (vanadium pentoxide). This oxide is acidic, and when added to water
Sulfuric acid is formed:

H2O+ SO3 → H2 SO4
(aqueous) (solid) (liquid)

It is thus an anhydrous sulfuric acid.