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Free research papers and essays on topics related to: atomic weight

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  • Aluminum - 1,420 words
    Aluminum Aluminum is one of a number of soft metals that scientists call poor metals. It can be shaped and twisted into any form. It can be rolled into thick plates for armored tanks or into thin foil for chewing gum wrappers. It may be drawn into a wire or made into cans. Aluminum is a generally popular metal because it does not rust and it resists wear from weather and chemicals. (Bowman, 391) Aluminum is an element. Its atomic number is thirteen and its atomic weight is usually twenty-seven. Pure aluminum melts at 660.2C and boils at 2500C. Its density is 2.7 grams per cube centimeter. Aluminum is never found uncombined in nature. (Bowman, 391) Aluminum is a very useful metal that is ligh ...
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  • Arsenic - 1,749 words
    Arsenic Element 33: Arsenic Abstract Arsenic is element 33 on the periodic table and is in Group 15. Arsenic is obviously an extremely poisonous element; however, some people have found arsenic to have a restorative effect on them. Chemically, arsenic is a metalloid. Two common forms of arsenic are gray and yellow. (see Figure 1-A) Element 33 has an atomic weight of 74.9216 and the chemical symbol of As. It boils at 613C, melts at 817C, and has a density of 5.72. (see Figure 2-A) The element has been known for centuries and can be easily obtained from ores such as arsenopyrite (FeAsS), realgar (As2S2), orpiment (As2S3), and arsenic trioxide (As2O3). There are many uses for arsenic. Among the ...
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  • Arsenic - 401 words
    Arsenic Element Arsenic may appear to be a poisonous element. This is because it is used as a poison for murder both in real life cases and in made up books. But there are a lot of chemical uses for arsenic such as it being a specimen. Arsenic is also known arsenic in French, Arsen in German, arsenico in Italian and arsenico in Spanish. The atomic number of the element arsenic is 33. The atomic weight is 74.92160(2). Its symbol on the periodic table is As and its electronic configuration is [Ar].3d10.4s2.4p3. Arsenic occurs in two solid modifications: yellow, and gray or metallic. Its color is tin- white which tarnishes to dark gray or black. Its luster is metallic but the tarnish will dull ...
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  • Calcium Element - 228 words
    Calcium Element Calcium Element symbol...CA Atomic weight...40.08 Element number...20 Number of protons...20 Number of electrons...20 Number of neutrons...20 Density at...68? F Boiling point...2,264?F Melting point...1,562?F Calcium was discovered by Sir Humphrey Davis in 1808. Calcium is a mineral found in abundance in the Earths outer crust. It is the fifth most abundant mineral in the Earth crust. Calcium is considered a major mineral because it is found in large quantity in the body. Milk also has a high amount of calcium and it is the best way to get calcium. Daily dietary requirements exceed over 100 mg. Calcium forms and maintains teeth, it helps with blood clotting, it helps build ce ...
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  • Dimitri Mendeleev - 639 words
    Dimitri Mendeleev Dimitri Mendeleev Derived by Dimitri Mendeleev, the periodic table may be one of the most informational tables contained in chemistry. By leaving gaps in the columns and rows, Mendeleev was allowing for the discovery of undiscovered elements of that time. From the properties of the elements surrounding these gaps, Mendeleev was able to predict the properties of these undiscovered elements. Finally, when other scientists discovered the tools of the periodic table, Mendeleev's achievements were recognized. Mendeleev was a versatile genius who was interested in many various fields of study, including pure and applied science. Dimitri Ivanovich Mendeleev. (1834-1907) , Dimitri ...
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  • How Chemistry Affects My Daily Life - 705 words
    How Chemistry affects my Daily Life I get up in the morning and I breath in oxygen and I breath out carbon dioxide. I get in the shower and use water *. I use soap in the shower also. I dry the water off with air molecules. I dry my hair by using a hair dryer, which uses electricity. Electrical affects are caused by the position and the movement of positively and negatively charged particles.I use cologne which has alcohol in it. I wash my clothes using water and soap. I light a candle. This is an example of combustion. For this to occur there must be a presence of combustible substance, a temperature high enough to cause combustion, and the presence of oxygen or chlorine. Of course when I l ...
    Related: chemistry, daily life, periodic table, atomic weight, hydrogen
  • Lead - 845 words
    Lead subject = Chemistry title = Lead Lead is a lustrous, silvery metal that tarnishes in the presence of air and becomes a dull bluish gray. Soft and flexible, it has a low melting point (327 C). Its chemical symbol, Pb, is from plumbum, the Latin word for waterworks, because of lead's extensive use in ancient water pipes. Itsatomic number is 82; its atomic weight is 207.19. Lead and lead compounds can be highly toxic when eaten or inhaled. Although lead is absorbed very slowly into the body, its rate of excretion is even slower. Thus, with constant exposure, lead accumulates gradually in the body. It is absorbed by the red blood cells and circulated through the body where it becomes concen ...
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  • Marie - 1,335 words
    Marie And Pierre Curie Marie Sklodowska ( a.k.a.) was born in Warsaw in 1867. Her parents were teachers who believed strongly in the importance of education. Marie had her first lessons in physics and chemistry from her father. She had a brilliant aptitude for study and a great thirst for knowledge; however, advanced study was not possible for women in Poland. Marie dreamed of being able to study at the Sorbonne in Paris, but this was beyond the means of her family. To solve the problem, Marie and her elder sister, Bronya, came to an arrangement: Marie should go to work as a governess and help her sister with the money she managed to save so that Bronya could study medicine at the Sorbonne. ...
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  • Marie - 1,223 words
    ... not being used. Theyre the work of separation and analysis began. Marie performed the chemical separations, while Pierre did the measurements after each successive step. Physically it was heavy work for Marie. She processed 20 kilos of raw material at a time. She had to clear away pine needles and debris, then she had to undertake the work of separation. In that shed they performed their experience and Marie writes that they spent the best times of their lives. Sometimes they could not do their processing outdoors, so the harmful gases had to be let out through the open windows. The only furniture was an old, worn pine table where Marie worked with her costly radium fractions. Since the ...
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  • Mendeleev Was Born In Tobolsk, Siberia He Was The Youngest Child Of A Large Family His Father Was A Local School Teacher Whos - 418 words
    Mendeleev was born in Tobolsk, Siberia. He was the youngest child of a large family . his father was a local school teacher whose career was ended by blindness and o support his family his mother ran a glass factory. Mendeleev learned some science from a political refugee who married one of his sisters. His father died in 1847, and soon after his mothers factory was destroyed by fire. She left Tobolsk with Mendeleev, she was determined that her last son should receive a good education. He studied chemistry at the University of Saint Petersburg, and in 1859 he was sent to study at the University of Heidelberg. There he met the Italian chemist Stanislao Cannizzaro, whose views on atomic weight ...
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  • Mercury - 514 words
    Mercury Mercury Atomic Number: 80 Latin: hydrargyrum liquid silver Atomic Symbol: Hg Atomic Weight: 200.59 Mercury is the only common metal that is a free-flowing liquid at room temperature. It is slightly volatile in room temperature and becomes solid when subjected to a pressure of 7640 atmospheres. The metal dissolves in nitric or concentrated sulfuric acid. The chief ore is cinnabar; Spain and Italy produce about 50% of the worlds supply of the metal. The commercial unit for handling mercury is the flask, which weighs about 76 pounds. The metal is obtained by heating cinnabar in a current of air and by condensing the vapor. The metal is widely used in laboratory work for making thermomet ...
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  • Nitrogen - 590 words
    Nitrogen Nitrogen, symbol N, gaseous element that makes up the largest portion of the earth's atmosphere. The atomic number of nitrogen is 7. Nitrogen is in group 15 (or Va) of the periodic table. Nitrogen was discovered by the British physician Daniel Rutherford in 1772 and recognized as an elemental gas by the French chemist, Antoine Laurent Lavoiser about 1776. Nitrogen is a colorless, odorless tasteless, nontoxic gas. It can be condensed into a colorless liquid, which can be compressed into a colorless, crystalline solid. Nitrogen exists in two natural forms, and four radioactive forms (artificial). Nitrogen melts at -210.01 degrees C, (-349.02 F), boils at -195.79 C (320.42 F), and has ...
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  • Oxygen - 1,067 words
    ... bon dioxide from the blood into the lungs and the breathing out of air), constitutes only one phase of respiration. A second phase of it is the transportation of oxygen by the blood from the lungs to the tissues and of carbon dioxide from the tissues to the lungs. A third phase is the absorption (passage by diffusion) of oxygen into the tissue cells and tissue use of oxygen (the oxidative and other respiratory processes with in the tissues cells whereby energy is liberated). External respiration involves the exchange of gases between the circulation blood and the air. For this exchange to take place, a person needs a large moist surface where air and blood can come in close contact. The ...
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  • Phosphorus - 1,137 words
    Phosphorus The element that is featured in this report is phosphorus. Phosphorus is a chemical element that human beings, animals, and plants need for normal growth. The main use of phosphorus is fertilizer. It was difficult to find a lot of different information on this element. Description Phosphorus is a nonmetallic chemical element that can exist in several different forms. The chemical symbol for phosphorus is P, its atomic number is 15, and its atomic weight is 30.975. Phosphorus was first prepared by the German alchemist Hennig Brandt in 1669; in the course of his search for the philosophers stone he obtained from a residue of evaporated urine a white solid that glowed in the dark and ...
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  • Platinum - 866 words
    Platinum I am a silvery metal that is as resistant to corrosion and tarnishing as gold. I am almost as rare and consequently am the likewise highly valued and used in Jewelry. I am also used in chemicals industry as a catalyst, in medicine as an anti-cancer drug, and in catalytic converters for car exhausts. I have an atomic number ok 78, my atomic weight is 195.09 (when rounded 195) and a symbol of Pt. Who am I? Im platinum of coarse! Platinum is a member of the six transition elements in Group VIII of the periodic table known collectively as the platinum metals (ruthenium, rhodium, palladium, osmium, iridium, and platinum). The name is derived from the Spanish platina, meaning, silver. The ...
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  • Platinum - 475 words
    Platinum subject = Chemistry title = Platinum Platinum is a relatively rare, chemically inert, metallic element. It symbol is Pt, atomic number is 78, and its atomic weight is 195.09. Platinum is one of the heaviest substances known. One cubic foot of Platinum weighs 21 times as much as a cubic foot of water. A grayish-white metal, Platinum has a melting point of 1772 degrees C and a realatively high boiling point of 3827 degrees C. It has a high fusing point, is ductile and malleable, expands slightly upon heating, and has high electrical resistance. Platinum is seldom used in its pure stage because it is too soft. The third most ductile metal, it can be drawn into a thread one twenty thous ...
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  • Potassium - 646 words
    Potassium potassium puh-tas'-ee-uhm The chemical element potassium is a soft, light, silver white metal. It is a member of the alkali metals, a group (IA of the periodic table) with similar physical and chemical properties. Its chemical symbol is K (from kalium, the Latinized version of the Arabic word for alkali). Its atomic number is 19, and its atomic weight is 39.098. Potassium was first made from potash, or potassium carbonate (K(2)CO(3)), which had important industrial uses in glass manufacture well before 1700. (It was often mistaken for sodium carbonate, or soda. Only their different sources prevented total confusion, potash being originally derived from the ashes of vegetable materi ...
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  • The Development Of The Atomic Theory - 1,467 words
    The Development Of The Atomic Theory The Greek concept of atomos: the atom Around 440 BC leucippus of Miletus originated the atom concept. He and his pupil, Democritus of abdera refined it for future use. Their atomic idea has five major points. All original writings of leucippus and Democritus are lost. The only sources we have for there atomistic ideas are inquotations from other writers. Democritus was known as the laughing philosopher because he enjoyed life so much. At this time Greek philosophy was about 150 years old, emerging in the sixth century bc, centered in the city of miletus on the ionian coast in Asia minor, which is now turkey. The work of leucippus and Democritus was furthe ...
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  • Things Are Different From Each Other, And Each Can Be Reduced To Very Small Parts Of Itself Ancient Knowledge - 596 words
    Things are different from each other, and each can be reduced to very small parts of itself. - Ancient knowledge This was noticed early by people, and Greek thinkers, about 400BC, used the words "element', and `atom' to describe the differences and smallest parts of matter. These ideas survived for 2000 years while concepts such as `Elements' of Earth, Fire, Air, and Water to explain `world stuff' came and went. Much later, Boyle, an experimenter like Galileo and Bacon, and who was influenced much by Democritus, Gassendi, and Descartes, lent important weight to the atomic theory of matter in the 1600s. It was Lavoisier who divided the few elements known in the 1700's into four classes, and t ...
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  • Titanium - 522 words
    Titanium William Gregor in 1791, who was interested in minerals, discovered titanium. He recognized the presence of a new element, now known as titanium, in menachanite, a mineral named after Menaccan in Cornwall (England). Several years later, the element was rediscovered in the ore rutile by a German chemist, Klaproth. The pure elemental metal was not made until 1910 by Matthew A. Hunter, who heated TiCl4 together with sodium in a steel bomb at 700-800C. Titanium is used for alloys with aluminum, molybdenum, manganese, iron, and other metals. These alloys of titanium are used principally in the aerospace industry, for both airframes and engines, where lightweight strength and ability to wi ...
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