Research Results For 'Barium'

JONS JAKOB BERZELIUS

Baron Jons Jakob Berzelius (John James Berzelius) was a Swedish chemist. He was born in 1779 and died in 1848. He studied medicine at Upsala, and after holding one or two medical appointments was appointed lecturer in chemistry in the Stockholm military academy in 1806, and the following year professor of pharmacy and medicine. In 1808 he became a member of the Academy of Sciences at Stockholm, in 1810 director, and in 1818 its perpetual secretary. In 1818 the king made him a noble, and in 1835 a baron. He was also a deputy to the National Assembly.

He discovered selenium and thorium, first exhibited calcium, barium, strontium, tantalum, silicium, and zirconium in the elemental state, and investigated whole classes of compounds, as those of fluoric acid, the metals in the ores of platinum, tantalum, molybdenum, vanadium, sulphur salts, etc, and introduced a new nomenclature and classification of chemical compounds. In short, there was no branch of chemistry to which he did not render essential service. His writings comprise an important Text-book of Chemistry, View of the Composition of Animal Fluids, New System of Mineralogy, Essay on the Theory of Chemical Proportions, etc. He was the founder of electrochemical theory and designed the system of chemical symbols still in use.
Research Jons Jakob Berzelius

UPPER GI SERIES

The upper GI series are X-rays of the oesophagus, stomach, and duodenum. The patient swallows barium first that makes the organs show up on x-rays.
Research Upper GI Series

TONITE

Tonite was a series of explosives prepared by the Cotton Powder Company. The tonite explosives were distinct in all containing barium nitrate as the oxidiser. Many of the tonite explosives included guncotton in their ingredients. One particular form of tonite detonated with a very loud noise and was used in the heads of sound signal rockets.
Research Tonite

ALKALI

Alkali is a term first used to designate the soluble parts of the ashes of plants, especially of sea-weed. Now the term is applied to various classes of bodies having the following properties in common: (1) solubility in water; (2) the power of neutralizing acids, and forming salts with them; (3) the property of corroding animal and vegetable substances; (4) the property of altering the tint of many colouring matters thus, they turn litmus, reddened by an acid, into blue; turmeric, brown; and syrup of violets and infusion of red cabbages, green. The alkalis may be regarded as water in which part of the hydrogen is replaced by a metallic radicle. The caustic alkalis are strong alkalis which have a powerful corrosive action on the skin, and the common ones are potassium hydroxide or caustic potash, sodium hydroxide or caustic soda, and lithic hydroxide. A solution of ammonia in water is termed ammonia hydroxide or volatile alkali. It is a much feebler alkali than the others, and when the solution is heated all the ammonia is driven off. Other alkalis are calcium hydroxide or slaked lime, a solution of which in water is known as lime water; barium hydroxide and strontium hydroxide, derived from the metals barium and strontium.
Research Alkali

BARIUM

Barium is a silver-white, malleable, toxic, bivalent metallic element of the alkaline-earth group that occurs only in combination - it is strongly reactive to air and has to be stored under mineral oil. It has the symbol Ba. Barium dissolves in water, but does not dissolve in sulphuric acid, rather the sulphuric acid causes a protective layer of barium sulphate to form around the barium.
Research Barium

CARBONATE

A carbonate is a salt formed by the union of carbon dioxide with a base element, such as calcium carbonate; sodium carbonate; barium carbonate; sodium bi-carbonate. Many of the carbonates are extensively used in the arts and in medicine.
Research Carbonate

EARTH METAL

The Earth Metals are the metals which in combination with oxygen form alkaline earths. They are calcium, strontium and barium and are never found in an uncombined condition, but oxidise rapidly into lime, strontia and baryta, the alkaline earths.
Research Earth Metal

FLUORESCENCE

Fluorescence is the process of emission of electromagnetic radiation resulting from the absorption of certain types of energy. Fluorescent paints are usually the sulphides of calcium, barium and strontium which glow in the dark after having been exposed to light for a while.
Research Fluorescence

LEMON YELLOW

Lemon yellow is a very pale yellow pigment used primarily as an artists's colour, made by precipitating barium chloride with sodium bichromate.
Research Lemon Yellow

LITHOPONE

Lithopone is a mixture of zinc sulphide and barium sulphate used as a white pigment in paints. It is a very pure white with a high degree of opacity, ranking next to titanium white in opacity. Lithopone disintegrates rapidly when exposed, and as such is only used for interior paints.
Research Lithopone

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