The History Of Carbon Essays - Chemical Elements,

The History Of Carbon The History of Carbon I. Introduction A. The History of Carbon II. Occurrences in Nature A. Diamond B. Graphite C. Coal and Charcoal D. Amorphous Carbon III. Carbon Compounds A. Inorganic B. Organic IV. The Carbon Cycle IV. Conclusion Carbon, an element discovered before history itself, is one of the most abundant elements in the universe. It can be found in the sun, the stars, comets, and the atmospheres of most planets. There are close to ten million known carbon compounds, many thousands of which are vital to the basis of life itself (WWW 1). Carbon occurs in many forms in nature. One of its purest forms is diamond. Diamond is the hardest substance known on earth. Although diamonds found in nature are colorless and transparent, when combined with other elements its color can range from pastels to black. Diamond is a poor conductor of heat and electricity. Until 1955 the only sources of diamond were found in deposits of volcanic origin. Since then scientists have found ways to make diamond from graphite and other synthetic materials. Diamonds of true gem quality are not made in this way (Beggott 3-4). Graphite is another form of carbon. It occurs as a mineral in nature, but it can be made artificially from amorphous carbon. One of the main uses for graphite is for its lubricating qualities. Another is for the lead in pencils. Graphite is used as a heat resistant material and an electricity conductor. It is also used in nuclear reactors as a lubricator (Kino*censored*a 119-127). Amorphous carbon is a deep black powder that occurs in nature as a component of coal. It may be obtained artificially from almost any organic substance by heating the substance to very high temperatures without air. Using this method, coke is produced from coal, and charcoal is produced from wood. Amorphous carbon is the most reactive form of carbon. Because amorphous carbon burns easily in air, it is used as a combustion fuel. The most important uses for amorphous carbon are as a filler for rubber and as a black pigment in paint (WWW 2). There are two kinds of carbon compounds. The first is inorganic. Inorganic compounds are binary compounds of carbon with metals or metal carbides. They have properties ranging from reactive and saltlike; found in metals such as sodium, magnesium, and aluminum, to an unreactive and metallic, such as titanium and niobium (Beggott 4). Carbon compounds containing nonmetals are usually gases or liquids with low boiling points. Carbon monoxide, a gas, is odorless, colorless, and tasteless. It forms during the incomplete combustion of carbon (Kino*censored*a 215-223). It is highly toxic to animals because it inhibits the transport of oxygen in the blood by hemoglobin (WWW 2). Carbon dioxide is a colorless, almost odorless gas that is formed by the combustion of carbon. It is a product that results from respiration in most living organisms and is used by plants as a source of carbon. Frozen carbon dioxide, known as dry ice, is used as a refrigerant. Fluorocarbons, such as Freon, are used as refrigerants (Kino*censored*a 225-226). Organic compounds are those compounds that occur in nature. The simplest organic compounds consist of only carbon and hydrogen, the hydrocarbons. The state of matter for organic compounds depends on how many carbons are contained in it. If a compound has up to four carbons it is a gas, if it has up to 20 carbons it is a liquid, and if it has more than 20 carbons it is a solid (Kino*censored*a 230-237). The carbon cycle is the system of biological and chemical processes that make carbon available to living things for use in tissue building and energy release (Kino*censored*a 242). All living cells are composed of proteins consisting of carbon, hydrogen, oxygen, and nitrogen in various combinations, and each living organism puts these elements together according to its own genetic code. To do this the organism must have these available in special compounds built around carbon. These special compounds are produced only by plants, by the process of photosynthesis. Photosynthesis is a process in which chlorophyll traps and uses energy from the sun in the form of light. Six molecules of carbon dioxide combine with six molecules of water to form one molecule of glucose (sugar). The glucose molecule consists of six atoms of carbon, twelve of hydrogen, and six of oxygen. Six oxygen molecules, consisting of two oxygen atoms each, are also produced and are discharged into the atmosphere unless the plant needs energy to live. In that case, the oxygen combines with the glucose immediately, releasing six molecules of carbon dioxide and six