10‚ 2014 Lab # 4: Melting Point lab Partner: Instructor: The Testing of the Melting Points of p-dichlorobenzene and naphthalene Introduction: Melting point temperature is a physical property of pure substances. It is an intensive property‚ which means the amount of material tested is irrelevant. This lab will determine the melting point temperatures of two known pure substances‚ naphthalene and p-dichlorobenzene‚ using micro-sized quantities and a capillary melting tube apparatus. The
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by our Brother Number One: Pol Pot Looking back to the early 1970’s many Cambodian lives had no significance to the great Communist nation‚ and they were told‚ "To keep you is no benefit‚ to destroy you is no loss." In northern Cambodia remain the victims of one of the worst mass murderers in the world history. Saloth Sar‚ better known as Pol Pot‚ was a Cambodian Maoist revolutionary who led the Khmer Rouge and became the leader of Cambodia on April 17‚ 1975. Pol Pot was randomly selected as one of
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BUS ADM 733 – Organization Development Book Review: Our Iceberg is Melting Our Iceberg Is Melting is a rather unique and most certainly entertaining fable by John Kotter and Holger Rathgeber. While the authors’ key intention was to portray an array of turbulent changes in the context of Eight-Step Change Model‚ the book also applies a multitude of other business theories to the concept of organizational change. As it has been mentioned in the paragraph above‚ the main constituent of change
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A zero-defect service? The case of a special hotpot restaurant chain in China (Source of information: Hong Kong Weekend Weekly Magazine Issue 707) Recently the media reported a hotpot restaurant chain which provides impeccable service to customers. This chain has over 70 branches in Mainland China. Ample positive comments have been spread among various media and customers on its “zero-defect” service at a very reasonable price (average check per pax is around RMB100). These have attracted hundreds
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potassium and chloride is an ionic bond. The potassium becomes a cation and the chloride an anion. The potassium end of the molecule becomes slightly positive and the other end slightly negative. Na – sodium contains metallic bonding. It has a high melting due to the bonding and has strong bonds. Each sodium atom is being touched by eight other sodium atoms and they all share electrons between the nuclei and shells. The electrons can move freely within the sodium metal and therefore can conduct electricity
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RECRYSTALLIZATION AND MELTING POINT DETERMINATION OF BENZOIC ACID ANSWERS TO QUESTIONS 1. How does the use of fluted filter paper hasten filtration? Why is it advisable to place a small piece of wire between the funnel and the mouth of the flask during hot filtration? Fluted filter paper is effective in preventing crystal formation in the filter paper. It is also often used in filtering hot saturated solution used during crystallization. One major advantage of a fluted filter is that it increases
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smoke inhalation and other dangerous chemicals strikes a blow to the pro-legalization claim that pot has medicinal value. Also‚ it is widely regarded as a gateway drug‚ which means that although perhaps it could be regulated‚ it may lead to a higher percentage of people trying harder drugs such as heroin and cocaine. Lastly‚ but perhaps most importantly‚ is that the legalization would make pot available to the youth in a similar way to how alcohol and cigarettes are obtained. The legalization
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a Homeostatic Mechanism using the Comparitive Melting-Point Method for two Crab Species. Abstract Two crab species‚ Plagusia and Cyclograpsus‚ were collected from a local estuary in the littoral and deep water zone for osmoregulation studies. To examine differences in osmoregulatory mechanisms among the species‚ haemolymph of the specimens was extracted once they were acclimated to varying concentrations of seawater. Using the comparative melting-point‚ capillary tubes were filled with small
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(47.48% yield). The crude acetaminophen was then recrystallized in a solvent of water and methanol over heat resulting in 0.082 grams (39.61% yield) of pure acetaminophen. Melting points of both crude and pure acetaminophen were taken‚ and found to be 165.9 - 170.9°C and 168.2 - 171.5°C‚ respectively. The literature melting point of acetaminophen is 169.5 – 171.0°C‚ indicating that our final product was pure. Introduction The synthesis of acetaminophen involves the attraction
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Section A: Aim of Investigation After they seized power in Cambodia in April 1975‚ Saloth "Pol Pot" Sar and the Khmer Rouge were responsible for the death of 1.5-3 million Cambodian’s and were perhaps one of the most ruthless regimes of the 20th century. The aim of this investigation is to evaluate Pol Pot’s means of maintaining power from 1975 to 1979. An account of Pol Pot and the Khmer Rouge’s drastic internal reforms including the slaughter of millions‚ economic reorganization‚ political restructuring
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