CROATICA CHEMICA ACTA CCACAA 78 (1) 99¿103 (2005) ISSN-0011-1643 CCA-2984 Original Scientific Paper Acid Value Determination in Vegetable Oils by Indirect Titration in Aqueous-alcohol Media Elena Kardash* and Yakov I. Tur’yan National Physical Laboratory of Israel (INPL)‚ Givat Ram‚ Jerusalem 91904‚ Israel RECEIVED JANUARY 16‚ 2004; REVISED JULY 21‚ 2004; ACCEPTED OCTOBER 28‚ 2004 Keywords acid value vegetable oils indirect titration A new method of acid value determination in
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MODERN DAY FARMING Introduction The daily pleasures of gardening are simple‚ inexpensive and profoundly satisfying. But in the ever-increasingly dense and sprawling cities‚ gardening on rooftops‚ patios and balconies is the only way to transform them into livable spaces that are lush‚ productive and purifying. Imagine picking a head of lettuce that was cultivated in your rooftop‚ or taking in the morning perfume of a flower in your balcony‚ or biting into a strawberry warmed by the sun…. Although
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ARTICLE IN PRESS Minerals Engineering xxx (2005) xxx–xxx This article is also available online at: www.elsevier.com/locate/mineng Silver recovery from synthetic photographic and medical X-ray process effluents using activated carbon K.G. Adani‚ R.W. Barley *‚ R.D. Pascoe Camborne School of Mines‚ School of Geography‚ Archaeology and Earth Resources‚ University of Exeter‚ Tremough Campus‚ Treliever Road‚ Penryn‚ Cornwall TR10 9EZ‚ United Kingdom Received 29 April 2005; accepted 24 May 2005
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GRADE 11 CHEMISTRY (30S) Final Practice Examination Answer Key GRADE 11 CHEMISTRY (30S) Final Practice Examination Answer Key IInstructions The final examination will be weighted as follows Modules 1–3 Modules 4–6 The format of the examination will be as follows: Part A: Fill-in-the-Blanks Part B: Multiple Choice Part C: Short Answer Total Marks Include units with all answers as required. Useful Information You will need the following in order to complete this examination: n n n n 15–20% 80–85%
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added: ΔT = Tmaximum - Tminimum = 45 – 20 = 25 0C * Calculate the number moles of copper sulphate reacted: number of moles = concentration x volume = 0.5 x 0.025 = 0.0125 mol * Calculate energy released during the reaction (Q): Q = mass of CuSO4 x specific heat capacity x ΔT = 25 x 4.2 x 25 = 2625 J * Calculate ΔH for the reaction (energy change is negative because the reaction was exothermic): ΔH = -Q / number of moles = 2625 / 0.0125 = 210 kJmol-1 ‘Absolute Uncertainty’ = abs/unc
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11A No color change‚ clear and transparent J. NaOH + AgNO3 12A Turned from clear to translucent light gray K. AgNO3 + NH3 1B Many tiny particles forming on the bottom for 3 minutes‚ then disappeared after exposure to bright light L. NH3 and CuSO4 2B Turned from clear to opaque light blue Part F: Testing of Various Foods with the NaOCl + KI solution Foods Presence or Absence of Starch A piece of bread Spot turned dark‚ starch presents Blue berry Spot did not turn‚ starch is absent Girl
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LET’S START WITH COPPER CHEMISTRY REPORT 2012 INTRODUCTION: The law of conservation of mass means that the atoms of an object cannot be created or destroyed‚ but can be moved around and be changed into different particles. This law says that when a chemical reaction makes two different atoms into a new product‚ the mass will be the same. Knowing this the mass of the copper should be the same at the beginning and at the end of the experiment. In this investigation we will see
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For this purpose 2 g of sample was taken in a digestion flask followed by addition of 2 g of digestion mixture (K2SO4:CuSO4 in 9:1 ratio) and 25 ml of concentrated sulphuric acid. The contents were digested till blue/ green transparent liquid was obtained. The volume of digested mixture was made up to 100 ml with distilled water. A 25 ml aliquot of this solution was distilled
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Experiment 3 : Identification of food constituents in milk Objectives To compare the composition of two different kinds of milk for fats‚ protein and reducing sugar. Introduction In this experiment two milk samples are given and its compositions are tested using different methods such as using benedict solution to test the presence of reducing sugar‚ using copper II sulphate to test the presence of protein‚ using K3( to test the presence of fat. However in this experiment‚ not only are
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Electrolysis Electrolysis is the process by which ionic substances are broken down into simpler substances using electricity. During electrolysis‚ metals and gases may form at the electrodes. What is electrolysis? Ionic substances contain charged particles called ions. For example‚ lead bromide contains positively charged lead ions and negatively charged bromide ions. Electrolysis is the process by which ionic substances are decomposed (broken down) into simpler substances when an electric
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