HKDSE CHEMISTRY – A Modern View (Chemistry) Coursebook 3 Suggested answers Chapter 25 Simple molecular substances with non-octet structures and shapes of simple molecules Page Number Class Practice 1 Chapter Exercise 2 Chapter 26 Bond polarity Class Practice 4 Chapter Exercise 5 Chapter 27 Intermolecular forces Class Practice 7 Chapter Exercise 9 Chapter 28 Structures and properties of molecular crystals Class Practice 11 Chapter Exercise 12 Part Exercise 14 Chapter 29 Chemical cells in daily life
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) Data Booklet 9701/13 May/June 2010 1 hour *2288633369* READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and
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at 59.5 grams before and after the reaction. The theory of conservation of mass states that mass cannot be created or destroyed‚ and this experiment supported that theory. Therefore‚ the combination of liquid lead nitrate and sodium iodide to create solid lead iodide and liquid sodium nitrate did not violate the conservation of mass. Experiment one is in support of the conservation of energy pertaining to chemicals because heat energy was released when magnesium (Mg) and hydrochloric acid (2 HCl)
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#1 LIMITING REAGENTS INVESTIGATION Aim: To determine the limiting reagent and percent yield of the reaction between potassium iodide with lead (II) nitrate solution. Apparatus required: Safety glasses‚ funnel stands‚ watch glass‚ oven‚ electronic balance‚ wash bottle with distilled water‚ test tubes‚ 10.0mL 0.50M lead (II) nitrate‚ 10.0mL 0.30M of potassium iodide solution‚ two 100.0 mL beakers‚ funnel‚ filter paper. Reaction Involved in Experiment: 2KI + Pb(NO3)2
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compounds of life) while all other compounds are called inorganic compounds. Classification of Compounds: A. Binary Compounds 1. Metal and Non-metal Inorganic compounds composed of just two elements‚ metal cations (positive ions) and non-metal anions (negative ions). These are referred to as metal-nonmetal binary compounds. There are two types of metals‚ some metals form cations with only one charge (e.g.Na+‚ K+) while other cations form
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1 Bromthymol Blue‚ 0.04% - 2 mL in Pipet 1 Copper (II) Sulfate‚ 0.2 M – 2 mL in Pipet 1 FDC Blue Dye #-1.0.1% - 2 mL in Pipet 1 Hydrochloric Acid‚ 1.0M-1 mL 1 Lead (II) Nitrate‚ 0.2 M- 2 mL in Pipet 1 PhenolphthaleinSolution1%1mL 1 Potassium Iodide‚ 0.1 M-2 mL in Pipet 1 Silver Nitrate‚ 0.1 N – 2 mL in white Dropper Bottle 1 Sodium Bicarbonate‚ 1 M – 2 mL in Pipet 1 Sodium Hydroxide‚ 1 M – 1 mL 1 Sodium Hypochlorite‚ 1% - 2 mL in Pipet 1 Starch Solution‚ 1% Stabilized - 2 mL in Pipet
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Modified Winkler Method for Dissolved Oxygen Determination Tiffany T. Lee Department of Biological Sciences‚ College of Science University of Santo Tomas‚ Manila‚ Philippines 1008 Date of Submission: February 17‚ 2011 Abstract In this experiment‚ the Winkler Method was used to measure the dissolved oxygen (d.o.) in a water sample from the pond in the Arch of the Centuries which had the owl statues. Then‚ the amount of oxygen is determined through a series of reaction. Usually‚ Winkler
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Chemistry SCH3U Unit 1 Lesson 1 Key Questions 1. List three physical properties and one chemical property of a) an iron nail * conducts heat and electricity well * solid at room temperature * ductile * rusts in water (chemical) b) gasoline * liquid at 20deg C * boils between 20 and 200 degrees Celsius * not soluble in water * flammable in the presence of oxygen (chemical) 2. People in a workplace should have access to MSDS sheets so that * chemicals
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Ind. Eng. Chem. Res. 1994‚33‚1687-1691 1687 Synthesis of Triphenyl Phosphate and Benzyl Benzoate with Phase-Transfer Catalyst in Heterogeneous Liquid-Liquid Reaction System S a t o r u Asai‚’ Hidemi Nakamura‚ Mitsunori Tanabe‚ and Kenji Sakamoto Department of Chemical Engineering‚ University of Osaka Prefecture‚ Sakai‚ Osaka 593‚Japan The synthetic reactions of triphenyl phosphate from diphenylphosphoryl chloride and sodium phenoxide and of benzyl benzoate from benzyl chloride and sodium
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------------------------------------------------- Titration From Wikipedia‚ the free encyclopedia (Redirected from Back titration) Not to be confused with the mathematical notion of tetration. This article is about volumetric titration. For other uses‚ see Titration (disambiguation). A Winkler titration to determine the concentration of dissolved oxygen in a water sample Titration‚ also known as titrimetry‚[1] is a common laboratory method of quantitative chemical analysis that is used
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