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 to the weight
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ABSTRACT Determining the melting point of a solid organic compound is the easiest way to identify the compound and determine its purity at the same time. For actual samples of compounds‚ the melting will occur over a range of temperatures making the melting points into a melting “range”. The difference between the temperature at which the sample begins to melt and the temperature at which it finishes melting‚ or the magnitude of the melting range‚ is a very important criteria of determining the
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Melting pointe determination #01 Introduction: Objective To learn how to obtain an accurate melting point using a MELTING POINT APPARATUS‚ then use them to draw eutectic curve and determine the eutectic point. Melting point of a solid is the temperature at which the solid and its liquid form are in equilibrium‚ i.e.‚ molecules move back and forth between the two states at the same rate‚ so both phases remain present. If the temperature of a solid is measured carefully as the solid is heated
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Freezing and Melting of Water. 10/24 Richard Landolfi Due Date:11/1 Purpose the purpose of this lab is to determine the freezing and melting temperature of water. Freezing temperature‚ the temperature at which a substance turns from a liquid to a solid‚ and melting temperature‚ the temperature at which a substance turns from a solid to a liquid. Hypothesis If the water is at a low temperature then it will freeze
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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 samples
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lObjective This experiment explores how salt and sugar affect the melting rate of ice in water. Research Questions: * Does adding salt to ice and water slow down‚ speed up‚ or not change the rate the ice melts in the water? * Is salt the only substance to have this effect? What about sugar? Knowing how to speed up the melting rate of ice is very important information for anyone who needs to de-ice roads or driveways after a winter storm. While it seems simple‚ adding salt to ice water
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the freezing point depression of a known amount in an aqueous solution. Freezing point depression is a colligative property of solutions. There are three other properties‚ which are boiling point elevation‚ vapor pressure depression‚ and osmotic pressure. Colligative properties of a solution depend on the amount of solute and solvent molecules and not the specific properties of the molecules. The temperature at which the solvent starts to freeze will be specified as the freezing point of the solution
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Molar Mass by Freezing Point Depression November 28‚ 2012 NAME Lab partner- Purpose: To determine the molar mass of an unknown substance by measuring the freezing point depression of a solution of an unknown substance and BHT. Equipment: Test tube‚ 18*150 millimeters Wire stirrer Weighing dish Timer‚ seconds Chemicals: 2‚ 6-Di-tert-butyl-4-methylphenol‚ BHT‚ 16 grams Cetyl alcohol‚ CH3(CH2)14CH2OH‚ 1 gram Unknown substance
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Purpose: The purpose of this lab was to determine the freezing point of pure water‚ the experimental van’t Hoff factor for a substance and the molar mass of an unknown solution. Reagents: 25mL deionized Water ¼ to ½ inches of rock salt 25mL Sodium Nitrate (NaNO3 ) 25mL unknown solution – handle unknown solution carefully Procedure: For part 1‚ the freezing point of deionized water was determined. An ice bath was prepared by filling a 600mL beaker ¾ full of ice and covered with ¼ to
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The Melting Pot Cultural assimilation is the blending or fusing of minority groups into the dominant society. There are many metaphors related to the concept of cultural assimilation in the United States‚ one being the melting pot. It suggests that all of the cultures that have been brought into America melt together and become the base material of the pot. This metaphor is considered somewhat accurate‚ but some people disagree with what it implies. There are some metaphors that better represent
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