started immediately with concomitant formation of a brown precipitate of crude acetanilide. 50ml of water and a magnetic stirring bar were added to stir the reaction mixture and the flask was heated on a magnetic stirring hot plate until all of the solid and oil were dissolved. The temperature of the reaction mixture at this point was close to 100°C‚ the boiling point of water. A few milliliters of hot solution was removed from the flask with a disposable pipette and placed in a test tube. The test
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Introduction Recrystallization is a method used to purify solid organic compounds. Using the recrystallization technique‚ a solid compound is dissolved in a solvent and the compound slowly crystallizes as the solution cools. Using a filtration technique‚ a pure solid is produced when the molecules of the impure particles in the compound are excluded from the crystal lattice. After obtaining the pure compound‚ a melting point determination procedure can be done using a mel-temp device to correctly
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[pic] Soap From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search For other uses‚ see Soap (disambiguation). [pic] [pic] A collection of decorative soaps‚ often found in hotels [pic] [pic] Two equivalent images of the chemical structure of sodium stearate‚ a typical soap. In chemistry‚ soap is a salt of a fatty acid.[1] Soaps are mainly used as surfactants for washing‚ bathing‚ and cleaning‚ but they are also used in textile spinning and are important components of lubricants
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Report on the preparation and stability of liquid Paraffin Emulsion Abstract This study describes the preparation of a Liquid Paraffin Emulsion from Paraffin oil‚ Emulsifying agents and Distilled water. This report will also evaluate the stability of the Liquid Paraffin Emulsion depending on how the emulsion is produced and whether using different methods of mixing will produce a more stable Paraffin Emulsion. Introduction An emulsion is a mixture of two or more liquids that are normally not
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graduated cylinder. The 50g of catalase and the 50ml of distilled water will be put into a blender and blended until liquefied. The catalase solution will then be introduced to a Buchner funnel filtration system to separate the catalase extract from any solid particles left over from the blending process. This step will be repeated until all of the catalases have been blended and filtered. Next‚ 5 ml of hydrogen peroxide will be measured out using a graduated cylinder. It will then be poured into a small
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Formal Lab Report | Chemistry | | Student name: Sara Hattar Grade: 10 ”C” | | Teacher: Christine Ziadat | | | Title: Investigating the effects of changing the concentration of an acid on the rate of reaction between HCl and Magnesium. Aim: In this experiment we are going to see the effects of using three different concentrations of HCl when added to Magnesium metal on the rate of reaction. Hypothesis: If the concentration of the acid increased in reaction between HCl (the acid)
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Biosphere Lab Report A biosphere can be defined a lot of different ways. Our interpretation of a biosphere is the area in which life can be contained within. In the case of the earth‚ it means as high as a bird can fly and as deep as fish can swim in the ocean. A biosphere is a closed system that has a constant flow of energy between the organisms living within it and it needs nothing outside of itself but sunlight to continue to be sustained. At the University of Arizona‚ they attempted to build
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Exocytosis Lab Report Rough Draft Abstract: In Paramecium caudatum‚ trichocysts are 10^3 secretory vesicles that are released from the cytoplasm. We first observed how the presence of Alcian blue dye triggers normal secretion of trichocysts‚ and we then tested four different hypotheses in order to determine how the presence of Ca++ ions in the extracellular and intracellular environment affects the secretion of trichocysts. Our first our hypothesis tested whether extracellular calcium is
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pressure bottle that acted as a catalyst‚ tetrafluoroethylene was compressed and accidentally polymerized into a white‚ waxy solid (Chemours‚ S.a). Synthesis
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Stoichiometry Lab Stoichiometry is the end result of adding up chemical elements that were involved in chemical reactions (http://dictionary.reference.com/browse/stoichiometry). The word stoichiometry was obtained from two greek words meaning element and measure. This explains the definition for the term. A chemist named Jeremias Benjamin Richter was the chemist responsible for first realizing what stoichiometry was (http://www.chemteam.info/Stoichiometry/What-is-Stoichiometry.html). In 1972
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