temperature be raised when determining a melting point? When can the temperature be raised more quickly? 2) If there is an Impurity present in a sample‚ what is the effect on the melting point? 3) Explain why a) salt‚ spread on roads in the winter‚ helps prevent icing in‚ for instance‚ southern Ontario‚ and b) salt is useless on the much colder roads of Manitoba. 1) You would have to slowly raise the temperature up when determining the melting point due to the sensitivity of the dulcin being
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drug. The identity of the drug was determined through melting point‚ percent recover‚ and Rf values. The comparable data for acetaminophen from the manufacturer is 500mg of active ingredient. After conducting the experiment-extraction‚ distillation‚ and evaporation- 451mg of active ingredient. This relates to a 68.1% recovery. The melting point was between 158 and 165 degrees Celsius‚ which is almost ten degrees lower than the published melting point of acetaminophen. After conducting a TLC plate‚ the
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EXPERIMENT 1 COLLIGATIVE PROPERTIES OF SOLUTIONS Date: December 03‚ 2013 Locker 21 Members: Vanessa Olga Dagondon Christine Anne Jomocan Janica Mae Laviste Nablo Ken Menez A. TYPES OF DISPERSED SYSTEMS Results and Discussion The first part of the experiment aims to differentiate the different dispersion systems. In this experment‚ three systems are introduced: true solution‚ colloidal dispersion and coarse mixture. The said three systems are classified through a property of colloids known as the
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Melting Ice * Salt is routinely used to make icy roads and sidewalks safe in the winter. As soon as the salt comes in contact with the ice‚ the surface of the ice starts to melt. This only works‚ however‚ if the temperature outside is at or near freezing. If it is too cold outside‚ the ice itself becomes very dry and salt is not as effective in melting it. Salt Reduces Freezing Temperature of Water * Salt works by lowering the freezing temperature of water. Salt water needs to reach a colder
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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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expected to compete with traditional petroleum-produced polymers. The production of Polyhydroxybutyrate is well known in the medical field as it is mainly used for surgical pins and internal suture due to its biocompatibility. It has a high melting point with about 175C‚ which makes the material compatible as containers with high temperature usage. These properties of being biodegradable meaning its products decompose naturally without surgery needed to remove‚ and biocompatible meaning the body
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Unit C2‚ C2.2.3 Covalent structures 1. This drill contains an electric motor. The diagram below shows the main parts of an electric motor. The carbon contacts are made of graphite. Springs push the contacts against the copper ring. The contacts conduct electricity to the copper ring. The copper ring rotates rapidly but does not stick or become worn because the graphite is soft and slippery. Graphite has properties which are ideal for making the contacts in an electric motor. Explain
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Practical 5: Properties of Compound Experiment 1: Properties of A Compound and Its Parent Elements Hypothesis The hypothesis of this experiment is magnesium oxide can be synthesized by combining (burning) the magnesium with oxygen. The chemical and physical properties of each element (magnesium‚ oxygen‚ and magnesium oxide) might be different‚ from the state‚ color‚ electrical conductivity‚ and pH. Aim This experiment was performed to synthesize magnesium oxide by direct combination of
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98075 Dear Mrs. Sylva‚ After days of research‚ I have come upon one of the substances that will be the ideal compound for the glaze. I conducted a test to analyze the solubility of the substance in water and alcohol‚ the conductivity‚ and melting point. Some substances came very close to passing all the tests‚ but only one substance was able to pass all of them. I recommend using sodium carbonate as your substance. Of all the substances‚ only two were covalent and two were ionic. The ionic
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OBJECTIVES: 1. to investigate the heating process for solid dodecanoic acid 2. to investigate the cooling process for liquid dodecanoic acid 3. to determine and compare the melting and freezing points of dodecanoic acid SUPPLIES: Equipment ring stand buret clamp hot plate test tube (18mm * 150 mm) assembly (half full with solid dodecanoic acid with thermometer embedded) beaker (400 mL) thermometer for water bath lab apron safety goggles Chemical Reagents dodecanoic acid‚ C11H23COOH
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