Химия
Абитуриентам и школьникам
Презентация
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  • добавлен 20 мая 2012 г.
Сера (на английском)
ПГФА Россия Сопина 10 слайдов 2012г.
In the free state sulphur occurs in nature in the form of transparent golden yellow crystals. Sulphur is a yellow solid substance. Sulphur in the free state possesses all the characteristics of a non-metal. Intense heating tus it into a brown vapour.
Sulphur does not dissolve in water; not it is wetted by water.
The sulphur combines with elements, such as the metals and hydrogen. The compounds of sulphur with metals are called sulphides.
Sulphur is used in the vulcanization of rubber, in the manufacture of matches, gunpowder, sulphuric acid and other sulphur compounds.
Sulphur occurs in nature in the free state and in combination with other elements. In Russia deposits of native sulphur are situated along the Volga. Sulphur also occurs in nature in the form of salts of sulphuric acid or sulphates - gypsum CaSO4 4H2O and sodium sulphate Na2SO
Also coal usually contains sulphur.
Sulphur is one of the elements without which plants and animals cannot develop, because sulfur is a constituent of proteins.
Gypsum is a good material for bandages.
Barium sulphate (BaSO4) is used in stomach Х-ray
screening.