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thức ngôn ngữ và đặc biệt là các kĩ năng thực hành giao tiếp (nghe‚ nói‚ đọc‚ viết) để người học có thể sử dụng ngoại ngữ như một phương tiện giao tiếp nói hoặc viết theo nhu cầu cá nhân‚ xã hội-nghề nghiệp. Các kĩ năng thực hành có mối liên hệ khăng khít‚ hỗ trợ‚ bổ sung lẫn nhau. Để thực hành tốt một ngoại ngữ‚ không thể chỉ chú trọng kĩ năng này mà coi nhẹ kĩ năng kia. Tuy nhiên‚ mỗi kĩ năng đều có những đặc điểm riêng biệt đòi hỏi phải tính đến và nghiên cứu kĩ lưỡng để có thể nâng cao hiệu quả
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39. The Viscosity of Liquids After studying the present lecture‚ you will be able to Define viscosity and viscosity coefficient Outline the method to measure viscosity using Ostwald viscometer Determine the average molecular weight of a polymer Determine the surface concentration of 1-butanol in aqueous solution Measure the distribution coefficient of a solute betweenn two solvents 39.1 Introduction Viscosity‚ one of the transport properties‚ arises because of intermolecular attractive and
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OF DISSOLVED OXYGEN CONTENT BY WINKLER REDOX TITRATION A. Standardization of Thiosulfate Solution Primary Standard used: KIO3 Formula Mass of Primary Standard: 214.0010 g/mol %Purity: 99.9% Formula Mass of KI: 166.00277 g/mol %Purity of KI: 99.9% Trial 1 2 3 KIO3 weight‚ g 0.1459 0.1458 0.1459 KI weight‚ g 1.0033 0.9857 1.0100 Volume of Na2S2O3‚ ml Final Volume‚ ml 22.6 25.5 22.9 Initial Volume‚ ml 0.0 0.0 0.0 Net volume‚ ml 22.6 25.5 22.9 B. Sample Analysis Volume of Sample: 400 ml Volume of sample
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clear blue with the 1 drop of HCl green/blue F. NaOCl + KI A2 rusty-yellow with 1 drop of starch black G. KI + Pb(NO3)2 B2 yellow‚ not clear H. NaOH + phenolphthalein A3 purple‚ violet I. HCl + phenolphthalein A4 clear J. NaOH + AgNO3 D3 murkey‚ brown K. AgNO3 + NH3 A4 purple‚ then cloudy white/clear after exposure to bright light pink tint L. NH3 and CuSO4 A5 cloudy dark blue Part F: Testing of Various Foods with the NaOCl + KI solution Foods Presence or Absence of Starch potato yes
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The Iodine Clock Investigation Introduction This is an investigation into the rate of a reaction and the factors that contribute to how fast a reaction will take place. Through the recording and analysis of raw data‚ this investigation also allows us to apply generally accepted scientific rules and to test them against results gained from accurate experimental procedures. Aim The aim of this experiment is to investigate the rate at which iodine is formed when the concentration
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I. Title: Analysis of a Commercial Bleach II. Purpose: III. Materials: Commercial bleach‚ 5% NaClO. (5 mL). Hydrochloric acid (HCl)‚ 3M. (6 mL). Potassium Iodide (KI). (6 g). Sodium thiosulfate solution (Na2S2O3)‚ 0.100 M. (70 mL). Starch solution 2%. (3 mL). Safety goggles Apron Digital scale Buret Buret clamp Erlenmeyer flask Pipet bulb Ring stand Ttransfer pipet‚ 5 mL and 25 mL Volumetric flask‚ 100 mL Stopper Wash bottle Distilled water Weigh boat Beakers‚ IV. Procedures:
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nothing seriously‚ all he likes to do is eat and train. The only time to take things seriously is when he is battling. When it comes to battling‚ he is very strategic. In the Dragon Ball Z universe people are able to use Ki. Ki is the force that’s forms of any living thing. Goku uses Ki to perform destructive‚ and powerful attacks. He has an arsenal of
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produced. This iodine will be converted into I3- which will react stoichiometrically with the thiosulfate. The thiosulfate to be used for titration was first standardized using KIO3 as the primary standard. KI crystals and sulfuric acid was added to the KIO3 solution one after the other. KI crystals should be added first or the solution may produce more O2 and add to the analyzed dissolved oxygen of the sample: The resulting solution was titrated right away with Na2S2O3 as the titrant and starch
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