Calces

L. calx, lime) Though lime was prepared by the Romans in the first century under the name calx, the metal was not discovered until 1808. After learning that Berzelius and Pontin prepared calcium amalgam by electrolyzing lime in mercury, Davy was able to isolate the impure metal. 

The word calcium is derived from calx, the Latin word for lime. The Romans used large quantities of calcium oxide or lime as mortar in constmction (see Lime and limestone). Because calcium compounds are very stable, elemental calcium was not produced until 1808 when a mercury amalgam resulted from electrolysis of calcium chloride in the presence of a mercury cathode. However, attempts to isolate the pure metal by distilling the mercury were only marginally successful. 

Zink-jodid, n. zinc iodide, -kalk, m. zinc calx, zinc ash. -kastea, m. zinc case zinc tank, -kiesel, m., -kieselerz, n. (siliceous) calamine. -kitt, m. zinc cement, -kohlea-batterie, /. zinc-carbon battery, -legierung, /. zinc alloy, -losung, /. zinc solution, -mehl,... 

Calcium Oxide (lime, Quicklime, Burnt Lime, Calx, Unslaked Lime, Fluxing Lime). CaO, mw 56.08, white or greyish-white lumps or powd, mp 2580°, bp 2850°, d 3.25-3.40g/cc. SI sol in w with formation of calcium hydroxide and evolution of large amts of heat sol in acids, and insol in ethanol. Coml prepn consists of heating calcium carbonate in kilns at 1000—1100° until all of the C02 is driven off. Lab prepn is by burning calcium carbonate or calcium oxalate at about 800° using a quartz crucible in an electric furnace... 

CAH Chronic active hepatitis CALLA Common lymphoblastic leukaemia antigen CALX Conjunctival associated lymphoid tissue CaM Calmodulin cAMP Cyclic adenosine monophosphate also knomt as adenosine 3, 5 -phosphate CAM CeU adhesion molecule CAP57 Cationic protein from neutrophils CAT Catalase CatG Cathepsin G... 

Petrinus, Rubellus. Laboratory Notes. The Verdet (and Calx of Venus). Alchemy J 2, no. 6 (Nov/Dec 2001). rhttp //www. alchemylab.com/AJ2-6.htm1. 

Name from calx (Latin = limestone calcium carbonate)... 

Calcium (Ca, [Ar]4s2), name and symbol from the Latin word calx (lime). Identified and isolated (1808) by H. Davy. 

This I also say, that if the spirit of common salt be joined to the spirit of wine, and distilled together with it, it becomes sweet, and loses its acidity. This prepared spirit does not dissolve gold bodily, but if it be poured on prepared calx of gold, it extracts the essence of its colour and redness. If this be rightly done, it reduces the white and pure moon to the colour of that body from which it was itself extracted. The old body may also receive back its former colour through the love of alluring Venus, from whose blood it, in the first instance, derived its origin. 

Calcium - the atomic mmiber is 20 and the chemical symbol is Ca. The name derives from the Latin calx for lime (CaO) or limestone (CaCOj) in which it was foimd. It was first isolated by the British chemist Humphry Davy in 1808 with help from the Swedish chemist Jons Jacob Berzelius and the Swedish court physician M.M. af Pontin, who had prepared calcimn amalgam. 

ORIGIN OF NAME Its modern name was derived from the word calcis or calx, which is Latin for "lime."... 

Synonyms Burnt lime calx lime quicklime... 

Oxygen had not yet been discovered at this time. Thus, to avoid confusion, I use this eighteenth-century term and also the corresponding term calx for the oxide of a metal. 

A more nearly correct theory of calcination and combustion had been proposed in the previous century. In 1630 the Frenchman Jean Rey theorized that the weight increase during calcination came about because air was incorporated into the calx. However, by the time the phlogiston theory was proposed, Rey s idea had been forgotten. It... 

He continued his experiments and discovered even more new gases sulfur dioxide, silicon fluoride, ammonia gas, and nitrogen. However, his most important discovery was oxygen. In June 1774 Priestley got a burning lens with a diameter of 12 inches and immediately began to experiment with it. In one experiment he turned the lens on mercury calx (mercuric oxide) and obtained an air in which candles burned more brightly than they did in ordinary air. At first he did not know what to make of this result, so he continued experimenting. He soon found that he could get the same gas from certain other materials, such as lead oxide. 

Experiment.—Lead, or any other metal except gold or silver, is calcined in the air the metal loses its characteristic properties, and is changed into a powdery substance, a kind of cinder or calx. When this cinder, which was said to be the result of the death of the metal, is heated in a crucible with some grains of wheat, one sees the metal revive, and resume its original form and properties. 

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