ether and the ether layer is disposed of. The washing ensures that tube 3 is strictly phenol. Recovery of the neutral substance Tube 1’’ is washed with saturated NaCl (0.3 ml) and the aqueous layer is discarded. To make sure all the water is removed CaCl2 drying pellets are added and the solution is transferred to a pre-weighed tube (tube 4). Tube 1’’ is rinsed 2-3 times with ether and the rinsing is placed into tube 4. Tube 4 is
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CERTIFICATE This is to certify that this dissertation titled “STUDY OF QUANTITY OF CAESIN PRESENT IN DIFFERENT SAMPLES OF MILK” submitted by Raunak Padamtintiwar to Chemistry department of Nirmal Higher Secondary School carried under guidance and supervision during the academic year 2014-2015. Mr Ninan Sir ACKNOWLEDGEMENT I wish to express my deep gratitude and sincere thanks to the Sir‚ for his encouragement and for all the facilities that he provided for this project work. I sincerely appreciate
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4/6/2014 Thermochemistry and calorimetry Chem 1 General Chemistry Virtual Textbook → Chemical Energetics →Thermochemistry Thermochemistry and calorimetry Chemical Energetics and thermodynamics - 4 The heat that flows across the boundaries of a system undergoing a change is a fundamental property that characterizes the process. It is easily measured‚ and if the process is a chemical reaction carried out at constant pressure‚ it can also be predicted from the difference between the
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Abstract This work describes the extraction of caffeine from tea leaves to determine its % caffeine. The extraction process selectively dissolves one or more compounds in a mixture into an appropriate solvent. In this experiment‚ it was visible in the process wherein the components of the tea leaves were dissolved in two solvents‚ water and dichloromethane (DCM)‚ with DCM used for multiple extractions. The organic layer was evaporated and the determined % caffeine was 0.12%. Furthermore‚ the purified
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hypotonic to the blood D) nontonic to the blood E) hypertonic to the blood 3) Water is a polar solvent and hexane (C6H14) is a nonpolar solvent. Which of the following correctly describes the solubility of the solute in the given solvent? A) CaCl2‚ soluble in hexane B) octane‚ soluble in water C) CCl4‚ soluble in water D) mineral oil‚ soluble in water E) NaHCO3‚ soluble in water 4) What is the concentration‚ mass/volume percent (m/v)‚ of a solution prepared from 46 g NaCl and 2.5 L of
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Chapter:-8 The d-and f-Block Elements POINTS TO BE REMEMBERED: --- The elements of periodic table belonging to group 3 to 12 are known as d-Block elements. The general electronic configuration of these elements is (n -1)d1-10 ns 1-2 d- Block elements are collectively known as Transition Elements because properties of these elements vary in between s-Block and p-Block elements. A transition element should have partially filled (n-1) d orbital. Group 12 elements i.e. Zn
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A series of 250ml Erlenmeyer flasks containing 100ml of M1 medium (0.2g NaNO3‚ 0.05g KCl‚ 0.05g MgSO4.7H2O‚ 1g glucose‚ 0.001g FeCl3‚ 0.02 g BaCl2‚ 0.05g CaCl2) at pH 6.8 with an addition of increasing concentration of deltamethrin was prepared. 1ml of 108 fungal spore suspension cultures was added into each of these flasks. These flasks were incubated at 280± 20C on the shaker at 120rpm for 7 days. Mycelium
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HKDSE Chemistry – A Modern View 1 (SAMPLE) Suggested Answers (Coursebook) |Chapter 1 The fundamentals of chemistry | |Class Practice |1 | |Chapter Exercises |3 | |Chapter 2 The atmosphere
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stirred until dissolved in 250cm3 of water * 25cm3 of this solution was placed into a conical flask and 3 drops of phenolphthalein indicator were added * A burette was filled with 0.2±0.02moldm-3 HCl * The HCl was titrated against the Na2CO3 and the data recorded in a table * The same procedure was repeated but this time using CH3COOH instead of HCl * The % of ethanoic acid was determined by titrating the standardized NaOH with it * Given that the % of ethanoic acid in this
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Chemical Reactions Lab Report Introduction: Chemical reactions is a process that involves rearrangement of the molecular or ionic structure of a substance. There are different types of reaction such synthesis‚ decomposition‚ single replacement‚ double replacement‚ and combustion. Synthesis is where two or more reactants combine to create a product. For Decomposition‚ it is the opposite where a product breaks down into reactants. In Single Replacement‚ reactants switches an element with another element
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