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Free research papers and essays on topics related to: melting point

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  • Albert Jung - 977 words
    Albert Jung Abstract: This lab assignment is to observe certain substances and observe its physical and chemical changes in different environmental conditions. We first observed its physical properties, such as physical state and color and recorded it on paper. Then we did different types of experiments on some of the substances and observed the chemical changes. Some of the chemical changes where endothermic, exothermic, changes in color and changing of its physical state. We recorded the observations. Introduction: The purpose of this experiment is to observe and record the physical properties and the chemical changes and to decide whether the changes were physical or chemical. We were giv ...
    Related: albert, jung, melting point, boiling point, heat
  • 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 ...
    Related: arsenic, ancient times, periodic table, atomic weight, periodic
  • As Long As The Human Race Has Been Cultivating The Soil, We Have Had To Deal With Other Vegetation - 1,265 words
    As long as the human race has been cultivating the soil, we have had to deal with other vegetation that ends up competing with the crops. People have tried many methods to get rid of these pesky weeds but they always seem to come back. This eventually led to development of pesticides and herbicides. Herbicides allowed people to kill off the unwanted weeds. Over time these herbicides became more and more specialized allowing them to only harm certain weeds as needed such as broad leaf killers. One of these specialized herbicides known as hexazinone. Hexazinone is used in the blueberry industry. Since low-bush blueberries only grow less than a foot high at the most, a plant that grows taller t ...
    Related: human race, vegetation, ground water, chemical formula, specialized
  • 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 ...
    Related: calcium, boiling point, atomic weight, melting point, davis
  • Chemical Compounds Bromine - 290 words
    Chemical Compounds Bromine The element Bromine, is a red liquid which is explosive at room temperature and has a red brown vapour. It has an atomic number of 35 and an atomic mass of 79.909. The melting point of Bromine is -7 deg.C and the boiling point is 58 degC with a relative density of 3.1. Bromine is a volatile dense mobile, that is a reddish brown liquid, which quickly gives a brown toxic valour with a disagreeable irritating odour. It combines directly with most elements although heat or a reactant is often neccessary to start some reactions. Hydrobomic Acid and Hypobromous Acid is a mixture that is formed when Bromine reacts with water. Oxygen is liberated by Bromine when the result ...
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  • Chromium - 867 words
    Chromium It was known by the 1950s that chromium was needed in humans to control blood sugar, but it wasn't until the 1970s that chromium's main role in humans was found out. It came accidentally, as a result of a new procedure that had been introduced to nourish hospitalized patients who could not take in food by eating. This method of nourishment was designed to give patients all the things people need to maintain health until they could eat normally and get these nutrients from food. Some of the patients who had been fed intravenously for months developed a high blood sugar level just like diabetics (even though they weren't). Then the doctors had to start insulin therapy to treat this di ...
    Related: chromium, coronary artery disease, right people, blood glucose, confirmed
  • Compilation Image Of Typical Political Leader - 407 words
    Compilation Image Of Typical Political Leader This country has many opportunities to offer, for instance a pro wrestler becoming a governor; however, I do not feel that just anyone is fit for the top office in this nation. One who seeks to possess the title of President should not only have the campaign money needed to run, but he should also contain certain character traits that will lead the country through the good times and the bad, and help us to continue to be a major world leader. Among those characteristics, three of the utmost importances are reliability, confident, and stable. The head of a country should have a high boiling point and a low melting point. He should not snap, crackl ...
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  • Crystals - 1,487 words
    Crystals Crystals What is a crystal? A crystal is a solid substance with definite geometric shapes and molecules that are arranged in a repeating pattern (Comptons ). Crystals have fixed angles between its faces, which have distinct edges. If the faces of a crystal can reflect light, then it will sparkle (Stangle). Crystals have constant angles because of the regular arrangement of its particles. There are seven types of crystals: cubic, tetragonal, orthorhombic, hexagonal, trigonal, monoclinic, and triclinic (Dr. Boyle). Crystals are classified by the shapes of their lattice or the regular, periodic configuration of particles (American Heritage). There are two different types of lattices. T ...
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  • Diamond - 1,187 words
    Diamond The unique nature of diamond is heavily dependent upon its composition, crystal structure, and mechanical, thermal, and electromagnetic properties.1 Of those dependencies, composition exacts the most influence over the characteristics. Crystal structure is the repeating pattern of diamonds composition, and each of the properties are the result of molecular interaction which is determined by composition. Therefore, composition is paramount in the determination of the qualities of diamond. Before its discovery, adamantane was known as decaterpene, the name applied by Decker to his tricyclic hydrocarbon. Decker believed that his decaterpene was similar in structure as the diamond lattic ...
    Related: diamond, mass production, natural process, scientific community, proceed
  • Diamond - 1,222 words
    ... as it provided a more efficient method for adamantane production. Schleyer was able to increase the output of his adamantane synthesis to a 30% and 40% yield by exposing the tetrahydrodicyclopentadiene to an AlCl3-HCl mixture under 40 atms. of pressure of hydrogen and HF-BF3 catalyst respectively.7 When Schleyer focused his procedure on the retrieval of adamantane, he found that the synthesis was bountiful with the starting reactant dicyclopentadiene which is a common compound.3 Research into the enigmatic compound could then proceeded full force from this point on to examine the compound to its every minute detail. What they found confirmed their previous assertions that adamantane was ...
    Related: diamond, college publishers, organic chemistry, atmospheric pressure, efficient
  • Hiroshima - 486 words
    Hiroshima The stories and events that unfold in John Hersey's, Hiroshima, have certainly been eye-openers for me. As a child in middle school and high school I, we have all heard of the atomic bomb and of course of Hiroshima, but never in as much detail or on such a personal level as these stories. Not even in chemistry or physics class, where I learned some of the specifics as to how the bomb works, had I known of the destructive force of the bomb or it's gruesome effects on human beings. As I mentioned before, this book was quite an eye-opener for me because it has taught me just how deadly nuclear weapons can be not only on material properties, but on human beings, and why nuclear weapons ...
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  • Hydrogen - 638 words
    HYDROGEN Hydrogen, symbol H, is reactive, colorless, odorless, and tasteless gaseous element. The atomic number of hydrogen is 1. The element is usually classed in group 1 of the periodic table. Hydrogen was confused with other gases until the a British chemist demonstrated in 1766 that it was evolved by the action of sulfuric acid on metals and also showed at a later date that it was an independent substance that combined with oxygen to form water. The British chemist Joseph Priestley named the gas "inflammable air" in 1781, and the French chemist Antoine Laurent Lavoisier renamed it hydrogen. Like most gaseous elements, hydrogen is diatomic, but it becomes and turns into free atoms at high ...
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  • Instruction Manual - 1,142 words
    ... lid and liquid will require the filtration process. The collection of the compound will be usually in a flask or another beaker after the chemical reactions have run their course. Remember: it is important that the experiment is complete before the purification can begin or there would be nothing to purify. Filtration Once the chemical reaction are complete and the experimental procedures are over, the filtration of the crude product can begin. Turn on the water facet and allow the it to produce a vacuum in the hoses and throughout the system. To test if there is a vacuum, the student should place their hand over the funnel and feel for suction. Now the student can slowly begin to pour t ...
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  • Introduction - 1,119 words
    Introduction Air pollution is nothing new. Ever since the discovery of fire, less-than-desirable substances have been vented into the air. One of the first air-pollution regulations dates back to the fourteenth century, when King Edward I banned the burning of sea coal in lime kilns. U.S. air-pollution regulations have their roots in British Common Law. But regardless of those efforts, air pollution continues to be a serious local and world-wide problem. Pollution is the pressure within the air of one or more substances that are harmful to human health, welfare, animal or plant life, or property. In the past with air pollution we included mainly the outdoor pollutants, although in recent yea ...
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  • 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 ...
    Related: lead poisoning, melting point, disease control, ancient egypt, yellow
  • One Of The Earliest Inventions Of The Ancient World, The Candle Is Still Favored For The Beautiful Light Cast By Its Flame In - 805 words
    One of the earliest inventions of the ancient world, the candle is still favored for the beautiful light cast by its flame. In its most basic form the candle consists of a cylinder of wax, tallow, or similar material surrounding and saturating a fibrous wick. Ancient Egyptian tombs at Thebes bear relief carvings of cone-shaped candles on dish-like holders, or candlesticks. The oldest known candle fragment was found at Vaison, near Avignon, in France and dates from the 1st century AD. During the Middle Ages in Europe, the usual source of light for poor peasants was the rushlight, consisting of a reed stripped to its pith and dipped in oil. Both tallow and beeswax candles were commonly known, ...
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  • Physical Geology Notes - 2,695 words
    ... ssure melting point (spec. pres =* melt) -low altitudes, meltwater and ice exist together * polar glacier- ice below pressure melting point -where temperatures remain below freezing Where do Glaciers Occur? -glaciers can form at or above the snowline -snowline- lower limit of perennial snow, dependent on local climate -climate-temperature and precipitation -sea level in polar altitudes, mountaintops in the tropics Glacier Ice -a metamorphic rock that consists of interlocking crystals of the mineral ice conversion of snow to glacier ice: 1. melting 2. evaporation 3. freezing 4. deformation under the weight of overlying snow and ice -under pressure grains develop -smaller, rounder, denser ...
    Related: geology, notes, physical characteristics, subduction zone, mississippi river
  • 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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  • Principle Of Superposition - 1,192 words
    ... ent kinds of active plate boundaries. An example of the most well known and studied fault is the San Andreas Fault located of the coast of California. 11. The origin of volcanoes: Hot spots, can be found on plate boundaries or inside the plates. The hot spot is a place deep inside the Earth that begins to form molten lava from extreme heat conditions. It will quickly rise up, pushing and melting its way to the surface resulting in a volcano. Because of the constant moving of the plates, the volcano will be carried away from the hot spot and become dormant. This process will repeat itself, forming a never-ending row of volcanoes. 12. The crust, being the absolute outer layer of the Earth ...
    Related: san andreas fault, earth first, high tech, ridge, atlantic
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