This lab experiment goal is to prove and hypothesizes which toothpaste actually cleans the teeth better‚ and how fast on the scale it moves towards closest to white. The topic for me is really relevant since I personally should be taking care of my teeth one of the main reason because I have braces‚ therefor I have to clean my braces often. This experiment briefly bring an idea and awareness to the people. They should know what kind of toothpaste they should buy when it comes to their teeth and how
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The purpose of this experiment was to acquaint the students with basic laboratory procedures‚ methods‚ and techniques; to introduce the use of basic laboratory measuring devices; to demonstrate different methods of manipulation of numerical quantities. DENSITY AND SPECIFIC GRAVITY Materials and Methods Part 1: Density of an Unknown Solid 1. We first were asked from our laboratory instructor to attain an unknown solid and were asked to note down the number of the solid. 2. Determine
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Organic Chemistry II Lab 9 Fermentation of a Carbohydrate: Ethanol from Sucrose * Introduction Ethanol is one of the oldest alcohols and also the least toxic one. Industrially‚ ethanol is made most economically by hydration of ethylene. However‚ ethanol that is intended for human consumption must‚ by law‚ be prepared by fermentation. By either method‚ ethanol‚ of course‚ has the same formula‚ structure‚ and properties. The fermentation takes place with the assistance of enzymes from yeast
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Chem 201 Lab October 21‚ 2011 Lab #6: Preparation of 2-chloro-2-methylbutane – an Sn 1 Reaction Purpose The purpose of this experiment was to prepare an alkyl halide‚ 2-chloro-2-methylbutane by reacting 2-methyl -2-butanol (t-amyl alcohol) with hydrochloric acid. Alkyl halides are of wide interest because they are widespread and have diverse beneficial and detrimental impacts .The overall reaction is given below: Procedure 1 ml of 2-methyl-2-butanol was measured using 1 ml syringe and
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# Now You See It – Copper Cycle Lab The purpose of the lab is to discover what happens when someone executes a series of procedures‚ beginning with copper metal. What is done | What is observed | 1. Started with copper‚ Cu (s). | reddish‚ brownish‚ orange-ish‚ powder-like | 2. Added nitric acid‚ HNO3 (aq). | acid turns blue and smells like chlorine. | 3. Added water‚ H2O (l). | stayed the same | 4. Added sodium hydroxide‚ NaOH (aq). | changed consistency‚ gel-like | 5. Heated the
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CHM130 Lab 7 Determining the Formula of a Compound A. Data Table (show completed data table here) (12 points) |Measurements |Mass (in grams) | |Mass of empty 100 mL beaker |55.45 g | |Mass of zinc metal
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esterification reaction that was carried out in this lab is shown in figure 1. It worth mentioning that the by-product of such reaction is water. In organic chemistry‚ the reaction in which water molecule is released is known as condensation reaction (Hornback‚ 2006). Figure1 is drawn using Chem Sketch software. a) b) Figure 1: Typical Fischer esterification reaction (a) in comparison to the specific esterification reaction used in this lab (b) The reaction can also be categorized in terms of
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NBER WORKING PAPER SERIES THE GROWTH OF OBESITY AND TECHNOLOGICAL CHANGE: A THEORETICAL AND EMPIRICAL EXAMINATION Darius Lakdawalla Tomas Philipson Working Paper 8946 http://www.nber.org/papers/w8946 NATIONAL BUREAU OF ECONOMIC RESEARCH 1050 Massachusetts Avenue Cambridge‚ MA 02138 May 2002 We wish to thank seminar participants at AEI‚ The University of Chicago‚ Columbia University‚ Harvard University‚ MIT‚ The University of Toronto‚ UCLA‚ Yale University‚ the 2001 American Economic
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Auteurs: Mohammed ‚ Ali Abusalah Elmabrok Mohammed‚ A. Année : 2012 A Practice Note 17 (PN17) Company is a listed company in the Malaysian Stock Exchange that is financially distressed or does not have a core business or has failed to meet minimum capital or equity (Less than 25% of the paid up capital). Financial ratio analysis method can be used to detect the failure of this company. As of 9th August 2010‚ there are still thirty four companies listed on Malaysian Stock Exchange classified under
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Step 4 was repeated 6 times for a total of 7 readings which were tabulated. 6. Steps 3-5 were repeated and the results were also tabulated as L and N. 7. A graph of L vs. N was plotted in order to fine the gradient (G). 8. Using the formula G=mρA ‚ the value of m as the mass of 1 paperclip was found where the density of water (ρ) is 1.0gcm-3. N(number of paperclips) | L (cm) | Average | | L1 | L2 | | 0 | 7.6 | 7.6 | 7.6 | 1 | 8.3 | 8.2 | 8.3 | 2 | 8.3 | 8.7 | 8.5 | 3
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