Unit 4 Review. 1. Which is not a method for collecting a toolmark on a doorframe? a. casting that portion of the doorframe b. photography b. removing that portion of the frame c. making a rubbing of the mark on the frame 2. Which tool most likely made these striations? a. pry bar b. screwdriver c. Pliers d. bolt cutter 3. Analysis of radial cracks from three impacts revealed that cracks from A stopped at cracks from Z. Cracks from Z stopped at cracks from B. Which is the correct order of the impacts
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2-butanol yielded 4.6% 1-butene‚ 67.3% trans-2-butene‚ and 28.1% cis-2-butene‚ and a dehydrohalogenation of 2-bromobutane yielded 19.1% 1-butene‚ 69.9% trans-2-butene‚ and 11.0% cis-2-butene. Backround: Gas Chromatography separates organic samples much in the same way as column chromatography. The only differences are that it uses a moving gas phase and a stationary liquid phase‚ and that the temperature of the gas system can be controlled. In a gas chromatograph the sample is shot in with a syringe
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COLUMN AND THIN LAYER CHROMATOGRAPHY Mark Paul P. Pastrana‚ Mariah Ericka M. Patawaran‚ Princess Juneire M. Peligro‚ Francisco Q. Pua III‚ Rose Anne L. Quyo and Janille P. Ragpa Group 8 2B Medical Technology Organic Chemistry Laboratory ABSTRACT The main objectives were to separate the colored components of malunggay leaves by means of column chromatography‚ as well as to determine the purity of the components using thin layer chromatography (TLC) and measure the Rf values of the colored
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1. What physical evidence did you find at the victim’s home? A box of matches‚ a space heater‚ beer bottles‚ Natalie’s wallet‚ a V-shaped burn pattern‚ burned outlet‚ a protected surface on the ground‚ crazed glass‚ and a puddle-shaped burn pattern. 2. Describe the process that you used to take a sample of the puddle-shaped burn pattern on the floor. Why did you also take samples from the portion of the floor that was not burned? First‚ I took the chisel to loosen up some of the wood chips
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Purpose The purpose of this experiment is to exemplify how differences in molecular weight allow separation of polymers from their monomers. Methods of dialysis and gel filtration chromatography will be used to separate a glucose monomer from a starch polymer. Colorimetric glucose oxidase assay will be used to monitor the presence of glucose and a colorimetric iodine assay will be used to monitor the presence of starch in prepared solutions
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Experiment 9 Thin Layer Chromatography Experiment: 9 Title: Thin Layer Chromatography Introduction: Chemical analysis is conducted on specific analytes (specific substance of interest in a mixture)‚ however it is often found that these analytes must be separated for the chemical analysis to conduct their analysis. Chromatography is a set up of laboratory a technique that is used to separate a chemical mixture. This technique is very useful as it allows us to follow the course of
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that might need this purification setup. Experimental Procedure: This lab follows the experimental procedure of the book as outline in the Mayo book on pages 133 and 134. However; the following modification were made to the procedure: Use gas chromatography instead of refractive index Collect GC for only fraction 1 and fraction 3 because of time constraints. Reaction Scheme: Data and Results: Compound Amount (mL) Boiling point (°C) Hexanes 1.5 62-69 Toulene 1.5 110-111
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Chemistry Laboratory I Experiment #6 - Column and Thin-Layer Chromatography (TLC) of a Spinach Extract Pre-Lab Assignment (1) List 5 ways that TLC can be used in an organic chemistry lab experiment. To identify an unknown‚ to monitor the course of a reaction and assess the purity of its product‚ to determine the best solvent for a column chromatography separation‚ to determine the somposition of each fraction from a column chromatography separation‚ and to determine whether a substance purified
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Chromatography Lab Questions Pre-Lab Questions 1. A pencil is used rather than a pen to mark the “starting line” in step two because a pen or marker while be used to place a small dot of ink in the center of the X that is made with a pencil. 2. Capillary action is filling of pores in a solid with a liquid. Capillary action is caused by spotting or absorption and is allowed to seep or flow through. 3. The type of pen that will probably give better separation in this paper chromatography
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physical properties. Paper chromatography will be used to separate the dye colors from M&M candy to see which colors contain yellow #5. Gravimetric separation will be used to separate salt and sand from a mixture. Procedure The procedure for this lab can be found on pages 16 – 30 in “General Chemistry CHE110L Laboratory Manual Fall 2013”. Data Tables Carbon copies of data tables have been attached to the back of this lap report. Calculations Paper Chromatography- 1. Yellow M&M’s Rf Value:
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