While it is easy to make comparisons between the pupil of the eye and the f-stop of a camera or between the retina of the eye and photographic film‚ once we get past the basic similarities of the optics of the two systems‚ comparisons begin to rapidly break down. The eye is not only much more complex than a camera and its film‚ but the two imaging devices function by different chemical mechanisms. The photographer (or the automatic exposure system of the camera) regulates the f-stop opening and time
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Characterization of Saponifiable Lipids and Characterization & Isolation of Complex Lipids Jan Kevin Roxas‚ Nashiba Samad‚ Erickson Santos Department of Chemistry‚ University of Santo Tomas‚ Manila‚ Philippines Abstract Lipids building blocks of different organic material that are water insoluble. This can be divided into simple and complex lipids that have several forms like waxes‚ triacylglycerols‚ phosphoacylgylcerols‚ sphingolipids‚ eicosanoids‚ isoprenoids and many other. To identify‚
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Synthesis and Analysis of the Coordination Compound Pentaaminechlorideocobalt (III) Chloride Heaven Lin and Forest Lin W.M. Keck Science Department‚ Claremont McKenna‚ Pitzer‚ and Scripps Colleges 925 N. Mills Avenue‚ Claremont‚ California 91711 Abstract Through using the spectrometer and titrations‚ the amount of the coordination compound‚ pentaaminechloridocobalt (III) chloride‚ was determined through a synthesis through an oxidation reduction of cobalt (II) chloride hexahydrate (CoCl2·6H2O)
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then topped. After the eluting solution has risen to within two centimeters of the top of the filter paper‚ the paper was removed from the beaker‚ dried‚ and was stained with a staining reagent solution containing potassium ferrocyanide and potassium iodide. This reagent forms colored precipitates or reaction products with many cations‚ including all of those used in this experiment. The distance of which the spots moved were determined by calculating the Rf value of each substance. The Rf value is determined
Free Solubility Chemical substance Sodium chloride
and methyl iodide(5ml) were added to the solution. The mixture was heated on a water bath for three hours. Acetone was removed and the residue was poured into water()150ml. The solid N-methypiperidone separated was filtered and recrystallised from ethanol. 4.6.General procedure for Preparation of the N-methylation of piperidin-4-one oximes: The piperidone (0.1mol)was dissolved in ethanol(50ml). saturated solutions of hydroxylamine hydrochloride and sodium acetate in water were added. The mixture
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such as proteins and polysaccharides(starch) that have dimensions significantly greater than the pore diameter of the dialysis tubing can pass through the tubings and they are retained inside the tubings.Smaller molecules such as water molecules and iodide ions are small enough to pass through the pores. The left-handed dialysis tubing contains 20%sucrose and iodine solution .The right-handed dialysis tubing contained 5% starch solution . The two entire dialysis tubings are submerged in distilled water
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Tin container testing Following are the different tests that are performed: 1) Temper Test: Standard: IS 1993- 1982 Take the sample strip of 90mm width. Carry out the ‘zero setting’ on Erichsen Testing machine. After zero setting‚ clamp the dial by tightening the screw. Insert the sample strip in machine and lock it by test piece holder. Confirm the light arrangement and the mirror is placed on its respective position. Switch on the lamp. Rotate the back screw at uniform speed‚ so that
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SERANGOON JUNIOR COLLEGE General Certificate of Education Advanced Level Higher 2 CHEMISTRY JC2 Preliminary Examination Paper 1 Multiple Choice Additional Materials: Data Booklet Optical Mark Sheet (OMS) 9647/01 23 August 2011 1 hour READ THESE INSTRUCTIONS FIRST On the separate multiple choice OMS given‚ write your name‚ FIN/NRIC and class in the spaces provided. Shade correctly your class and FIN/NRIC number. Eg. If your NRIC is S9306660Z‚ shade S9306660Z for the item “index number”. There
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sulfate by titration. The concentration of Cu2+ ions in a solution can be found by reaction with an excess of aqueous iodide ions to produce iodine. The amount of iodine formed can be found by titration with thiosulfate ions‚ S2O32–. For Examiner’s Use FB 1 is aqueous copper(II) sulfate‚ CuSO4. FB 2 is 0.100 mol dm–3 sodium thiosulfate‚ Na2S2O3. FB 3 is aqueous potassium iodide‚ KI. starch indicator Read through the instructions carefully before starting any practical work.
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was the role of the indicators (Lugol’s and Benedict’s solutions) used in the cell model experiment? Explain your answer using results you obtained from the cell model experiment. Lugol’s solution is a solution of elemental iodine and potassium iodide in water‚ and it’s been used in this experiment as a reagent for starch detection. Benedict’s reagent has been used as a test for the presence of reducing sugar‚ which include lactose and maltose. 3- Explain the medical importance of tonicity
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