![]() The metal can be identified in the composition of compounds by the undissolved sediments of some salts of the element (fluoride, calcium carbonate, sulfate, silicate, phosphate, sulfite) The reaction of water with calciumĬalcium is stored in container under a layer of protective liquid. Flame test: brick-red color originates from calcium The qualitative reaction to the calcium ion is that a flame turns a bright, rich brick-red color. Owing to its high activity in an ordinary state, calcium is stored in the laboratory in a dark glass, with a tightly closed lid and under a layer of paraffin or kerosene. For example, cave stalactites and stalagmites consist of calcium carbonate which gradually forms from water, carbon dioxide and hydrocarbonate under the influence of processes inside underground water. Calcium displays interesting properties in the composition of salts. It reacts violently with acids, sometimes bursting into flame. In open air, it immediately interacts with oxygen and carbon dioxide, so it becomes covered with a grey coating. When heated it reacts with nitrogen, hydrogen, carbon, silicon, boron, phosphorous, sulfur and other substances. Click here for learning more about calcium compounds. In normal conditions, it easily reacts with the formation of corresponding binary compounds: with oxygen and halogens. ![]() The chemical properties of calciumĬalcium is an active metal that enters into many interactions. Calcium is also extracted from its oxide with the use of aluminothermy – a method that is widespread in metallurgy. Nowadays, the electrolysis of calcium salts (mixtures of calcium and potassium chlorides, mixtures of calcium fluoride and chloride) is still the most effective method of obtaining the metal. ![]() He was the first to discover the nature of the interaction of compounds of solid metals and salts with an electric current. Calcium was first synthesized as a metal by the British scientist Humphrey Davy. The element was not discovered until the early 19th century. But when pressure is increased further, the metallic properties are restored, and it displays the properties of a super-conductor, which exceeds other elements in these parameters by several times.įor a long time, it was not possible to obtain the metal in free form – owing to its high chemical activity, this element is not encountered in nature in pure form. When pressure is applied to calcium, it begins to lose its metallic properties and capacity for conducting electricity. It boils at a temperature of 1484 degrees Celsius. The density of the element is light – it is a soft metal that can be cut with a knife. When heated, it first moves to a liquid, then to a vaporous state, and loses its metallic properties. The element is a good conductor and heat conductor, and has a shiny silver-white color. ![]() The aggregate state of calcium in ordinary conditions is solid, and the metal melts at a temperature of 842 degrees of Celsius. Physical properties of calcium and methods for obtaining the metal The type of bond in the molecule of calcium is metallic. The characteristics of calcium depend on the arrangement of its crystal structure, which exist in two types – cubic face-centered and body-centered. Pure calcium in a protective argon atmosphere We have many chemical reactions sets for kids delivered under monthly subscription. Sea water has a high concentration of calcium (400 mg/l). ![]() It is an alkaline earth element, as when it dissolves in water it forms alkalis, but in nature it is encountered in the form of numerous minerals and salts. It is widespread in the earth’s crust, with a percentage of around 1.5%. The element has importance for technical and industrial chemical syntheses. With high chemical activity, the element can form many compounds that belong to different classes. In ordinary conditions, calcium is a metal with a silvery-white color. The symbol of the element is Ca, after the first two letters of the word calcium. The formula of the highest oxide is CaO. The atomic mass of calcium, according to the periodic table, is 40.08. Calcium is found in the fourth large period, second group, main sub-group, with the atomic number 20. ![]()
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