Hong Kong Diploma of Secondary Education Examination Integrated Science School-based Assessment Sample Tasks Teachers may use the sample tasks for non-profit making educational and research purposes with proper acknowledgement. © 2009 Hong Kong Examinations and Assessment Authority All Rights Reserved 2009 TABLE OF CONTENT Task C1 C2 C4 C5 C6 C7 C8 E3 Title Osmosis in Living Tissue Catalytic Activity of Enzyme Action of Electricity on Substances Encountered in Daily Life Do
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the reader about Amylase’s ability to withstand acidic or basic pH. To do this‚ two test tubes were both filled with 5mL of a 5% amylase solution. The first one was filled with an acid‚ while the other was filled with a base. After dropping liquid Iodine and Benedict’s solution into each one‚ the tube with a basic pH tested positive for glucose. The acidic solution tested (mostly) negative for glucose‚ although there were trace amounts at the bottom. Overall‚ my conclusion is that only acidic solutions
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Research Article Vol: 2; Issue: 1 SYNTHESIS AND ANALYSIS OF BENZOPINACOL FROM BENZOPHENONE BY PHOTOREDUCTION IN GREEN CHEMISTRY. 1 Lata.C.Potey‚ 2* Dr. Satish B. Kosalge‚ 3 Rajeshwari S. Sarode 1 2 Assistant Professor‚ Hi-Tech College of Pharmacy‚ Chandrapur. Principal‚ Hi-Tech College of Pharmacy‚ Chandrapur 3 Assistant Professor‚ Hi-Tech College of Pharmacy‚ Chandrapur. Date Received: 11 TH Jan 2014 Date of Accepted: th 16 Jan 2014 Date Published: 18th
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shows the typical and maximum concentrations of common ions: Ions | Concentration (Sydney water supply) (ppm) | Recommended maximum (ppm) | Chloride | 20 | 400 | Sulfate | 8 | 400 | Nitrate | 0.4 | 10 | Fluoride | 1 | 1.7 | Sodium | 10 | 300 | Calcium | 9 | 200 | Aluminium | 0.2 | 0.2 | * The concentration of sodium (Na+) and chloride (Cl-) ions are important indicators of the salinity of a water system‚ and also affect the taste of water * Magnesium and calcium ions are
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Introduction * Properties And Uses Of Fluorine * Fluoridation Of Water * Chlorofluorocarbons * Chlorine * Introduction * Uses Of Chlorine * Chlorine And Organic Compounds * Bromine * Introduction * Halogen Lamps * Iodine * Introduction * Uses And Applications * Astatine * Introduction * Uses And Applications Introduction & daily life applications of halogens INTRODUCTION: * Table salt‚ bleach‚ fluoride in toothpaste‚ chlorine in swimming
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Core Module 1: The Chemical Earth Contextual Outline The Earth includes a clearly identifiable biosphere‚ lithosphere‚ hydrosphere and atmosphere. All of these are mixtures of thousands of substances and the use of this pool of resources requires the separation of useful substances. The processes of separation will be determined by the physical and chemical properties of the substances. In order to use the Earth’s resources effectively and efficiently‚ it is necessary to understand the properties
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PART IX - SPICE AND SALT 106. Prohibition to sell sub-standard spice (1) No person shall import‚ process‚ store‚ expose for sale or sell any spice which does not comply with the standard specified in paragraph (2). (2) (a) Spice shall be the sound leaves‚ flowers‚ buds‚ fruits‚ seeds‚ barks or rhizomes of plants that are suitable for use as condiments for imparting any flavour or aroma to food; (b) Aniseed shall be the dried‚ ripe fruit of the plant
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ALL the questions. 1. Complete the table. Name of compound calcium bromide NH4NO3 sodium sulphite copper(I) oxide PbO2 iron(III) sulphate Q1 (Total 6 marks) Formula of compound 2 *N36637A0220* Leave blank 2. Complete the following statements by inserting the missing colours. (a) When water is added to anhydrous cobalt chloride‚ it turns ............................................... . (1) (b) When iodine is heated‚ it forms a
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below. Which salt is least soluble in water .. at 2O° C? 2. How many grams of potassium chloride can be dissolved in 200 g of water at 80° C? IO 3. At 40° C‚ how much potassium _ __nitrate coin be dissoiu$tl ^n 30D.g of water? ------W- ’1 80 70 ...- O --60 0 5© 40 4. Which salt shows the least change 30 In solubility from 0° - 100° C? 20 10 At 30° C‚ 90 g of sodium nitrate Is 0 20 30 40 50 60 70 80 90 100 Temperature (0 °C) dissolved in 100 g of
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purpose of this experiment is to synthesize isopentyl acetate via an esterification reaction between glacial acetic acid and isopentyl alcohol‚ using concentrated sulfuric acid as a catalyst. The product was washed using sodium bicarbonate and water‚ then dried with anhydrous sodium sulfate. It was then distilled using a standard simple distillation apparatus. The percent yield of isopentyl acetate was 60.39%. This may have been low due to incomplete distillation or evaporation once entering the receiving
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