arrangement. My unknown turned out to be gram positive bacteria cocci shaped with long chain cell arrangement. The unknown was gram positive because the cells stained blue-violet ‚this indicate that my unknown has ability to retain crystal violet-iodine after alcohol application on the cells which is a gram positive characteristic caused by more peptidoglycan than gram negative organisms on cell walls . To observe the cell morphology I used a light microscope oil immersion for a total magnification
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below: 2Al(s) + 3I2(s) 2AlI3(s) (a) Determine the limiting reagent and the theoretical yield of the product if 1.20 moles of aluminium and 2.40 moles of iodine are used. (Ans: 489.218 g) (b) Calculate the percentage yield of the product if 450 g of AlI3 is obtained. (Ans: 91.98%) 4. A salt solution is produced when 2.9 g of sodium chloride‚ NaCl dissolved in 200 ml of water. Calculate the molality (m) of the NaCl solution‚ given that the density of water is 1.00 g ml⁻1. (Ans: 0.25 m) [Apr 2013]
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CONTENTS Lamm Table of Content now needs to be re-arrange to match labs in body of manual. ORGANISMS IN THE ENVIRONMENT 2 DIFFUSION 3 OSMOSIS 4 PHOTOSYNTHESIS I (STRUCTURE OF THE LEAF) 6 PHOTOSYNTHESIS II (STARCH TEST ON LEAF) 7 PHOTOSYNTHESIS III (IMPORTANCE OF CHLOROPHYLL) 8 NUTRITION I (ENZYME ACTION) 9 NUTRITION II (FOOD TESTS) 11 FOOD TEST INSTRUCTIONS 13 RESPIRATION I (RESPIRATORY SUFACES) 15 RESPIRATION II (STRUCTURE OF A FISH GILL) 16 TRANSPORT IN PLANTS (TRANSPIRATION) 17 RESPONSE I (PUPIL
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2 mL of the cobalt chloride solution was added to three separate test tubes (A‚ B‚ and C). 1 mL of silver nitrate (milky white color) was added in test tube A Three gains of calcium chloride was added to test tube B 1 mL of Hydrochloric Acid was added to test tube C Activity D: Solubility of Carbon Dioxide: Approximately 10 mL of fresh seltzer water
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Materials 4.0g tomato paste screw cap vial Chromatography column 25ml buret 50ml flask ring stamd and clamp 50% mixture of acetone and low boiling petroleum ether 5ml extraction solvent 20ml 10% aqueous solution and 20ml of saturated sodium chloride Procedure PEPARING CHROMATOGRAPHY COLUMN Pack a column for chromatography- ref. OP-21a clamp column to ring stand over 25ml beaker close column with cork or rubber stopper EXTRACTING PIGMENTS use OP-18c to extract the solid material
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Colourless gas with a smell of rotten eggs (H2S); turns lead acetate paper black 1. Sodium nitroprusside test: WE + sodium nitroprusside 4 = purple / violet colour 2. Lead acetate test: WE + lead acetate 5 (aq) = black ppt 5. Nitrite: Pungent light brown gas 1. Starch-iodide test: WE + dil H2SO4 (or dil acetic acid); boil‚ then add solid KI + fresh starch sol = deep blue colouration Group II (conc H2SO4 group) – Cl(chloride)‚ Br- (bromide)‚ I- (iodide)‚ NO3- (nitrate)‚ CH3COO- (acetate)‚ C2O42(oxalate):
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Alex Wilson 9/11/12 Experiment #2 Separating the Components of Panacetin: Introduction: Of the three components likely to be present in your sample of Panacetin (aspirin‚ acetanilide‚ and starch)‚ only starch is insoluble in the organic solvent dichloromethane (or methylene chloride)‚ CH2 Cl2. If a sample of Panacetin is dissolved as completely as possible in dichloromethane‚ the insoluble starch can be filtered out‚ leaving acetanilide and aspirin in solution. The purpose of this experiment
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or the products like ester might evaporate or escape into the atmosphere result in the low yield of ester. In addition‚ during transfer of liquid‚ for example‚ transferring the liquid from a round-bottom flask to a separating funnel or transferring the organic layer from separating funnel back to
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Waste Be Made Useful?‚ Lab Inquiry in Chemistry. Belmont: Brooks/Cole‚ 2009. "Silver Chloride (AgCl) - Properties and Applications." Silver Chloride (AgCl) - Properties and Applications. The A to Z of Materials‚ 2013. Web. 18 Feb 2014. <http://www.azom.com/article.aspx?ArticleID=2305>. "Sodium Sulfate Applications in the Past‚ Present‚ and Future." Sodium.org. Web. 18 Feb 2014. < http://www.sodiumsulfate.org/Sodium-Sulfate-Uses.html>. "Zinc Coatings - How They Work." Zinc. International Zinc Association
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) Data Booklet 9701/13 May/June 2010 1 hour *2288633369* READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and
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