The Purity and Purification of Solids Melting Points CH-337 Abstract: The purpose of this experiment was to find the eutectic point for the mixture of naphthalene and biphenyl. This was done by measuring the melting point of both pure substances and five mixtures of different ratios. The purpose of the second section was to identify an unknown sample by measuring its melting point and mixing it with two known substances and comparing them. The results suggest that the eutectic point is closest
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PREPARATION OF ASPIRIN AND DETERMINATION OF THE MELTING POINT Ferrer‚ Lara Melissa V. Faculty of Engineering University of Santo Tomas Manila‚ Philippines ABSTRACT This experiment involved three steps: synthesis of aspirin‚ isolation and purification‚ and the estimation of purity of the final product. The synthesis involved the reaction of salicylic acid and acetic anhydride in the presence of a catalyst‚ phosphoric acid‚ H3PO4. When the aspirin was prepared‚ it was isolated and filtered. The percentage
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TECH0701: Measuring the Melting Points of Compounds and Mixtures Introduction This exercise dealt with the melting points of pure mandelic acid and benzoic acid. The eutectic temperature and composition of mandelic and benzoic acid mixtures were determined. And finally‚ an unknown was identified by its mixtures and melting point. The melting point of a compound is used by organic chemists not only to identify the compound‚ but also to establish its purity. To determine the melting point two temperatures
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Secondary POTS means that there is an underlying cause for the symptoms that occur leading to damaged nerves. Secondary causes include anemia‚ adrenal disorders‚ Ehlers-Danlos‚ Lyme Disease‚ tumors‚ and many others. Anemia can show symptoms of POTS. Problems with the adrenal gland‚ which produces the stress hormone cortisol and other hormones that maintain adequate salt and water in the body‚ can lead to orthostatic symptoms and low blood pressure. Ehlers-Dalos in a genetic disorder that affects
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Our Iceberg is Melting: Changing and Succeeding Under Any Conditions John Kotter and has produced a great book that contains a wealth of wisdom and insight. While it looks and reads like a simple book‚ it is anything but simple. The message which Kotter is able to make clear goes much deeper than the surface story of a colony of penguins in search of answers pertaining to their survival on an iceberg. He easily describes a scenario through a penguin colony that any person can relate to and think
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The current knowledge of stingless bees is clearly described by Vit et al. (2013) in their book‚ “Pot-Honey: A legacy of stingless bees”. The stingless bees have populated the tropical earth with pantropical distribution for over 65 million years which is longer than Apis‚ the stinging honeybees. They are over 500 discovered species and possibly 100 more are yet undescribed. Generally‚ stingless bee colonies make far less honey compared to honey bees. Meliponines basically have stingers with highly
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The Requarter The quarterly newsletter of the Rochester American History Roundtable Volume 1‚ Number 2 Greetings! The Rochester American History Roundtable presents “The Assassination of President John F. Kennedy” featuring panelists Vanessa Tesch‚ Thomas Ostrom and Chad Israelson at 4PM on November 17‚ 2013 at the History Center of Olmsted County‚ 1195 W Circle Drive SW‚ Rochester‚ Minnesota. This event is free and open to the public. The Rochester American History Roundtable is sponsored
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Postural Orthostatic Tachycardia Syndrome (POTS) From the time we are born till the time we die there is a muscle inside of us that is the root of our existence‚ it’s a muscle so dominant that we can actually hear and feel it throughout our growth‚ daily activities‚ and emotions of our everyday life. Inside our body there is a powerful muscular pump‚ which is known as the one of the main organs in the human body. This hollow‚ cone shaped‚ pump lies slightly left within the center of the chest
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The Rise and Fall of Pol Pot Pol Pot‚ infamous for his connection to the Khmer Rouge that identified with communism‚ held power in Cambodia from 1975-1979. Although‚ this is only a short period of time‚ he undoubtedly left a lasting impression on the Cambodian population. Pol Pot’s revolution failed to increase the level of Human Rights and wealth for the Khmer people. Pol Pot and his party became obsessed with eliminating “enemies” of the Khmer Rouge from the population. They devastated any chance
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Our iceberg is melting by John Kotter “Once upon a time a colony of penguins was living in the frozen Antarctic on an iceberg near what we call today Cape Washington.” The following summary will explain the key moments of the fable and how they relate to our lives. First‚ let’s introduce some of the more important penguins – the Leadership Council members. Louis‚ the head of the Leadership Council‚ could perhaps be considered the CEO of the penguin colony. Alice is a smart‚ aggressive member
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