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Search results 91 - 100 of 278 matching essays
- 91: The Physics Of A Crystal
- ... of crystals. If you were to examine a lump of crystalline material very closely, you would be able to see tiny individual crystals. All crystals have a definite geometric shape, determined by the way the atoms are linked together. Mineralogists recognize 32 different classes of crystal, which are grouped into seven crystal systems. Crystal systems are described by their axis, which are imaginary lines that join the center of opposing faces ... atom and there are no planes along which the giant molecule can easily be split. This quality is what gives diamond its tremendous hardness. Graphite on the other hand, consists of flat sheets of carbon atoms arranged in adjoining rings. Each carbon atom is linked to three others by fairly strong bond that all lie in the same plane. These can easily be overcome, allowing the sheets to slide over each ...
- 92: Nuclear Energy 2
- ... happens in a nuclear reaction. Ann E. Weiss, who has written several books on the subject of nuclear energy, described what happens inside a nuclear power plant. In a nuclear reaction the nuclei of its atoms split, producing energy in the form of heat. The heat makes steam which powers a turbine. Fission takes place in a nuclear reactor. The fuel used is pellets of uranium. In a modern reactor, half ... Once this is done a single free neutron is enough to set off the reaction. As the reaction continues, a moderator slows the neutrons down enough to ensure that they will continually split more uranium atoms. At the same time, the moderator acts as a coolant. It keep the overall temperature about 300 degrees Celsius. Since the temperature at spots inside the fuel rods may be as high as 1,100 ...
- 93: Electric Charge
- ... repelled, each other. The evidence showed that electric force made matter either attract or repel other matter. Electric force is caused by electric charge. Electric charge is a property of the bits of matter within atoms. Electric force can cause matter to attract or repel because there are two kinds of charge positive and negative charge. The effects of electric force can be summarized as the law of electric charge: Pieces ... scientific law. The law of conservation of charge states all electric events occur by rearranging or moving charge. The law of conservation of charge holds true for all events, whether in objects as small as atoms or as large as stars. A scientific model is used to explain the transfer of charge between objects. I.e. when you walk across a carpeted room, your shoes scuff against the carpet and pick ...
- 94: Drug Identification With Gas Chromatography Mass Spectrometr
- ... of compounds, with the only restriction that the analyzed substance needs to have sufficient volatility. The theory behind the mass spectrometer is to use the difference in mass-to-charge ratio (m/e) of ionized atoms or molecules to separate them from each other. Mass spectrometry is therefore useful for quantitation of atoms or molecules and also for determining chemical and structural information about molecules. Molecules have distinctive fragmentation patterns that provide structural information to identify structural components. The combination of the gas chromatograph and mass spectrometer is ...
- 95: Diamonds
- ... Arkansas. Right now about 100million carats are mined each year. Today the largest cut Diamond in the world is the Cullian I at 530.2ct . The unit cell of a Diamond is cube. Five carbon atoms form tetrahedra at the cube corners , at the centers of each of the cube faces, and at four sites within the cube. The carbon atoms are located at the center of each tetrahedron . The carbon tetrahedra are covalently bonded, which explains why diamonds are extremely hard. The toughness of the Diamond comes from four planar directions of weakness , it is ...
- 96: Carbon Dioxide
- ... gas that occurs in small quantities in the earth's atmosphere naturally. The earth's ocean, soil, plants and animals release CO2. The formula of Carbon Dioxide is CO2. The CO2 molecule contains 2 oxygen atoms that each share 2 electrons with a carbon atom to form 2 carbon - oxygen double bonds. The atoms are arranged as so (OHT). This is called a 'linear molecule'. Carbon dioxide is commonly found as a gas and is never a liquid. It sublimes to a solid known as 'dry ice' which is ...
- 97: Big Bang
- ... then electrons, and finally neutrinos. After about an hour, the temperature had dropped below a billion degrees, and protons and neutrons combined and formed hydrogen, deuterium, helium. In a billion years, this cloud of energy, atoms, and neutrinos had cooled enough for galaxies to form. The expanding cloud cooled still further until today, its temperature is a couple of degrees above absolute zero. In the future, the universe may end up ... expanding infinitely into the darkness. This space will become even emptier, as the fundamental particles of matter age, and decay through time. As the years stretch on into infinity, nothing will remain. A few primitive atoms such as positrons and electrons will be orbiting each other at distances of hundreds of astronomical units.7 These particles will spiral slowly toward each other until touching, and they will vanish in the last ...
- 98: An Investigation Into Electrical Resistance
- ... a current of 1 A to pass through a resistance of 1 Ohm. In an electric circuit electrons pass through the wires. Metals, having a giant structure as a characteristic, contain free electrons in their atoms which can move almost unhindered through the metal when a potential difference is applied. Resistance is caused by obstructions in the pathways of the electrons: these obstructions are basically the nuclei of the metal atoms. The heat that is caused in resistance wires is attributable to this factor: the inelastic collisions between the electrons and nuclei causes kinetic energy to be changed into heat energy. Length of the wire If ...
- 99: Marcus Aurelius
- ... theory. However, if one examines the roles of each in Stoicism, it becomes apparent that they can coexist. God created all of the universe, and all of the universe is made up of matter and atoms. It is interesting to note that several times in Meditations, Aurelius expressed a kind of doubt in God. He repeatedly used the phrase, "if there is a god," rather than a more definitive belief in ... could affect a persons soul, so he considered the soul far superior to the body. Aurelius view on death is very much like that of Democritus. He viewed death simply as the dissolution of atoms, while Democritus believed that death was simply objects breaking apart. Aurelius also believed that the fear of death was useless, and that is was ignorant to fear something that one has never experienced before. He ...
- 100: Marcus Aurelius
- ... theory. However, if one examines the roles of each in Stoicism, it becomes apparent that they can coexist. God created all of the universe, and all of the universe is made up of matter and atoms. It is interesting to note that several times in Meditations, Aurelius expressed a kind of doubt in God. He repeatedly used the phrase, "if there is a god," rather than a more definitive belief in ... could affect a person s soul, so he considered the soul far superior to the body. Aurelius view on death is very much like that of Democritus . He viewed death simply as the dissolution of atoms, while Democritus believed that death was simply objects breaking apart. Aurelius also believed that the fear of death was useless, and that is was ignorant to fear something that one has never experienced before. He ...
Search results 91 - 100 of 278 matching essays
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