What is the Winkler Method? The Winkler Method is a technique used to measure dissolved oxygen in freshwater systems. Dissolved oxygen is used as an indicator of the health of a water body‚ where higher dissolved oxygen concentrations are correlated with high productivity and little pollution. This test is performed on-site‚ as delays between sample collection and testing may result in an alteration in oxygen content. How does the Winkler Method Work? The Winkler Method uses titration to determine
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Experiment 1: Calorimetry INTRODUCTION In the calibration of the calorimeter‚ the net ionic equation used is H+(aq) + OH-(aq) H2O(l). The reaction released heat and is said to be exothermic. HCl is the limiting reactant of the reaction and o.oo5 moles of it was used. The heat generated by the reaction is 55.8 kJ. The sign of T of the reaction used for calibration is opposite to that of H. In the determination of heats of reaction‚ the reaction of 15 mL 1 M CuSO4 + 0.05 g Zn produced a
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9/22/2011 Basic Chemistry Why are we studying chemistry? • Biology has chemistry at its foundation Elements • All matter composed of basic substances called elements • Living organisms require about twenty of the known elements Together‚ carbon‚ hydrogen‚ nitrogen and oxygen make up 95% of the elements found in the body. Atoms • All elements made of tiny particles called atoms • Made up of: – Nucleus • contains protons (+ charge) and neutrons (no charge) – Outside
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English Literature (Paper 1) Candice Giselle Cutinha #313 Question2 ‘He wishes for the Cloths of Heaven’ by W.B. Yeats deals with the theme of unrequited love and the poet has been able to bring out this aspect in such a vivid manner. He expresses his love by saying that if he had all the riches in the world‚ he would give them to the one he loved in order to show her how much she meant to him and since he isn’t rich‚ he gives her his dreams instead. The poem ends with some kind of a word of
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Episode 207 — The one where Ross finds out Part I. Important Plots 207 Ross and his girlfriend Julie are about to adopting a cat. Everyone thinks that Chandler puts on a little weight‚ Monica volunteers to train him. Rachel gets a date with Michael that Monica set for her‚ bet she can’t pay attention on him but keep bothered by Ross’s and Julie’s cat. During the date‚ Rachel calls Ross and leaves him a message saying she is over him. When Ross hears the message he is taken aback that Rachel
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4 real If I show you‚ get to know you If I hold you just for today I’m not gonna wanna let go I’m not gonna wanna go home Tell me you feel the same ’Cause I’m 4 real‚ are you 4 real? I can’t help myself‚ it’s the way I feel When you look me in the eyes‚ like you did last night I can’t stand to hear you say goodbye Well‚ it feels so right ’cause it feels so right Just to have you standing by my side So don’t let me go ’cause you have my soul And I just wanted you to know I don’t wanna
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INTERNATIONAL BACCALAURÉAT BACHILLERATO c BACCALAUREATE INTERNATIONAL INTERNACIONAL MARKSCHEME May 2002 CHEMISTRY Standard Level Paper 3 12 pages M02/420/S(3)M+ –5– Subject Details: M02/420/S(3)M+ Chemistry SL Paper 3 Markscheme General ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Each marking point is usually shown on a separate line or lines. Alternative answers are separated by a slash (/) – this means that either answer is acceptable. Words underlined are essential for the mark. Material
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whose relative is Mrs. Ghosh. Das was telling me about the boy of Ghosh family. Mr. Rai-Well it would be better if we could have a talk with Ghosh family and speak about the proposal. Mr. Rai-Oh! Yes you can wait I will get it from Mrs. Das. N- {Mrs. Rai exists} After Mrs. Rai gets the number. Mr. Rai-Oh! So the number is 7322252241. Let me call the Ghosh family. Mr. Rai-Hello! Mr.
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Name SOLUTIONS ACCT 1210DL Exam #1-Chapters 1‚ 2 & 4 Spring 2010 Ethical Statement – I ____ _________________ hereby (signature) attest that I completed this exam on my own with no assistance from others. If you e-mail this‚ you MUST include this statement in the body of your e-mail that has the exam attached. 1. Presented below is a list of costs and expenses incurred in the factory by Nu-Way Corporation‚ a manufacturer of recreational vehicles. Complete the following matrix
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SYNTHESIS AND CHARACTERIZATION OF HIGHLY CROSSLINKED HYALURONAN HYDROGELS Newell R. Washburn1‚ Sidi A. Bencherif1‚ Abiraman Srinivasan2‚ Jeffrey O. Hollinger2‚ Ferenc Horkay3‚ Krzysztof Matyjaszewski1 Departments of 1Chemistry and 2Biomedical Engineering Carnegie Mellon University‚ Pittsburgh‚ PA 15213 3 Laboratory of Integrative and Medical Biophysics National Institutes of Health‚ NICHD 13 South Drive‚ Bethesda‚ MD 20892 Introduction Methacrylation of hyaluronic acid (HA) with glycidyl methacrylate
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