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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melting points were 111.2˚C and 109.8˚C when each compound was mixed with the unknown. Therefore‚ the unknown #10 was dibenzoyl ethylene. Introduction The melting point is defined as the temperature at which the solid is in equilibrium with its liquid‚ and this characteristic is very unique‚ so a substance can be determined by the melting point. Determination of the melting point is very important technique in many areas of chemistry especially‚ in organic chemistry area because the melting point
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dichloromethane and the solution was poured into a separatory funnel. 2. 20 ml of aqueous sodium bicarbonate solution was added to the dichloromethane. A stopper was placed on the separatory funnel and was shaken and pressure was frequently released. The 2 liquids separated into clear layers and the lower layer (dichloromethane layer) was tapped into an Erlenmeyer flask. The aqueous layer was placed into a 400 ml beaker. The dichloromethane was placed back in the separatory funnel. 3. The dichloromethane was
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Villanueva‚ Justeen Wong Department of Chemistry‚ University of Santo Tomas‚ Manila‚ Philippines Abstract This experiment has been divided into 4 set-ups‚ first was the solid-liquid extraction‚ next was the liquid-liquid extraction‚ then the sublimation and last was the melting point determination. The solid-liquid and liquid-liquid extraction were both done during the first meeting‚ the DCM layer was filtered and dried in the evaporating dish and kept inside the locker. The dried was light green‚ somewhat
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Materials Science and Engineering A 528 (2011) 1078–1086 Contents lists available at ScienceDirect Materials Science and Engineering A journal homepage: www.elsevier.com/locate/msea Cyclic loadings and crystallization of natural rubber: An explanation of fatigue crack propagation reinforcement under a positive loading ratio N. Saintier a‚∗ ‚ G. Cailletaud b ‚ R. Piques b a b LAMEFIP‚ Arts et Métiers ParisTech‚ Esplanade des Arts et Métiers‚ 33405 Talence Cedex‚ France Centre des matˇeriaux
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PREFORMULATION STUDIES ON PHENYTOIN AGGLOMERATES PREPARED BY HOT MELT Dr. Maged Fawzy DEEF Pharmaceutical Industries Company‚ SA This work was a part of Master thesis presented in Faculty of Pharmacy‚ AlAzhar University‚ Egypt 2007 INTRODUCTION Hot Melt Hot melt agglomeration is one type of wet granulation techniques that may be utilized to enhance the dissolution profile of water insoluble drugs. Hot melt agglomeration is also called thermoplastic granulation and it may be defined as the
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The simulation and analysis of liquid droplets with respect to heat capacity and droplet size Abstract Define Using Molecular dynamic simulation a cluster of particles was modelled and their behaviour analysed with respect to temperature change. As proof of a specific state i.e. solid‚ the Mean squared displacement was calculated and illustrated with respect to time. This occurred for varying temperatures. From the internal energy of the system per time step‚ the heat capacity was determined
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del Valle Department of Biological Sciences‚ College of Science‚ University of Santo Tomas‚ España‚ Manila‚ Philippines Abstract Caffeine was extracted from Lipton tea leaves by multiple extraction techniques namely solid to liquid extraction and liquid to liquid extraction; the purification by sublimation and melting point determination. Three teabags with weight 6.2674g were boiled with water and then extracted with 60 mL DCM; extract was dehydrated with anhydride Na2SO4 then was collected
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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? The way the fluted filter paper is folded hastens filtration because it increases the surface area of the filter paper‚ giving the solution more area to go through. A piece of wire is placed to avoid build-up of pressure‚ and easily pour the solution without spilling. 2.) Enumerate 2 techniques that can help
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The 1960s was an era that changed America in so many ways. While many of the changes were in Civil Rights and in humanity in general‚ another change would come in the form of science and even the way we look at body armor and self protection in general. 1967 was the year in which a the world would have been introduced to Kevlar. Kevlar Not only influenced our military it also has changed the face of everyday American products. Discovered in 1965 an American chemist with the name of Stephanie Kwolek
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