After the Khmer Rouge takes over the city of Phnom Penh in 1975‚ the Ung family struggles to stay together. Days go by without food and rest‚ making it hard to stay strong while traveling. Over the course of several years‚ the family becomes separated and several members die‚ leaving Loung Ung to question the concept of her family. From Loung’s perspective in her memoir‚ “First They Killed My Father”‚ her family is vital although they are forced to separate and start new lives. However‚ after all
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recrystallized to form a solid‚ clear‚ crystal- like product. The melting was taken from the recrystallized product to determine what had been obtained. The melting point was found to be 130.5°C-133.7°C. Concluding that the product formed from the addition of bromine was a mixture of the erythro-2‚ 3-dibromo-3-phenylpropanoic acid‚ which has a known melting point of 204°C‚ and threo-2‚3-dibromo-3-phenylpropanoic acid‚ which has a known melting point of 95°C. Meaning the recrystallized product was a racemic
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Lab 6: Organic Compound Analysis Isabella O’Toole CHY 116 Friday 1:15-4:00 Lab Conducted on 4-12-13 and 4-19-13 4-26-13 This lab was conducted in order to determine the chemical composition of an unknown organic acid. A known mass of acid was dissolved into 30mL of either water or methanol (depending on solubility) and titrated with standardized sodium hydroxide. Data from this allowed the molar
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until the BHT melts. As soon as evidence of melting occurs‚ record the temperature. Repeat the experiment using the BHT and the unknown substance. Pre-Lab Questions 1. a. 53.02 – 50.78 = 2.24 °C b. molar mass = __7.1 °C/m X 2.04 g (solute)__ 0.0248 kg (solvent) X 2.24 °C molar mass = 260. g 2. Colligative properties are physical properties of solutions that depend upon the number but not the kind of solute particles present. Data Melting Points Pure BHT | 68.8 °C | BHT + cetyl
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Andrew Li Jolle AP World History 12 August 2013 The Cambodian Genocide’s effect on the Ung Family In examining the reasons causing the tragedy of the Ung family after the Cambodian Genocide in 1975‚ one can assume that these reasons include economic breakdown (continuity of the Angkar trading crops for firearms)‚ government collapse (changes in the soldiers’ behavior towards the villagers‚ continuity of Khmer Rouge killing villagers at Lo Reap)‚ and the lack of social interactions (changes in
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BASIC CHEMISTRY (UDBB 1114) BACHELOR OF SCIENCE (BIOTECHNOLOGY) SESSION : MAY 2013 DATE : 25 JUNE 2013 LECTERUR : EXPERIMENT 4 DETERMINING MOLECULE WEIGHT BY FREEZING POINT DEPRESSION METHOD STUDENT NAME : ID : LAB PARTNERS | | INTRODUCTION According to Anne‚ n.d‚ the freezing point of a liquid is decreased by adding to another compound to it. This is known as freezing point depression. The pure solvent will have higher freezing point than the solution. Colligative property of
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Background The melting point of a compound is the temperature at which the solid is in equilibrium with its liquid. A solid compounds changes to a liquid when the molecules acquire enough energy to overcome the forces holding them together. A mixture melting point is useful in confirming and used to indentify an unknown compound‚ which we will be doing in this particular experiment. Purpose Measure the melting points of pure benzoic acid and pure mandelic acid. Determine the eutectic composition
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Melting Points Elizabeth McGrail Organic Chemistry I 25 January 2013 ABSTRACT The objectives of this lab are‚ as follows; to understand what occurs at the molecular level when a substance melts; to understand the primary purpose of melting point data; to demonstrate the technique for obtaining the melting point of an organic substance; and to explain the effect of impurities on the melting point of a substance. Through the experimentation of three substances‚ tetracosane‚ 1-tetradecanol and
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Abstract: A qualitative analysis experiment was conducted to determine the identity of an unknown aldehyde or ketone. The tests include a Tollens test‚ a Schiff test‚ an iodoform test‚ and a derivative melting point test. The data of the first three tests was inconclusive. The final derivative melting point test was utilized to successfully determine that the unknown was the ketone‚ Propiophenone. Introduction: Qualitative analysis is a method or series of methods used to determine the identity
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generally high melting points‚ are loose and flexible with their electrons‚ conduct electricity well‚ and have low solubility in water. Ionic compounds are generally crystals‚ have a high melting point‚ and usually have high solubility in water and conduct electricity well when dissolved in water. Covalent compounds have individual molecules‚ have a low melting point‚ and do not conduct electricity‚ and their solubility in water depends on the type of covalent bond. In the melting point test
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