THE MOLE CONCEPT References : Mohammed and Lambert ( Old Edition) Chapter 11 pg. 107 Mohammed and Lambert ( New edition) Chapter 8 pg 123 Anne Tindale Chapter 10 pg 46 The following topics will be covered : 1. Definition of Relative Atomic and Relative Molecular Masses. 2. Calculation of Relative Molecular Masses 3. Converting Moles to Grams / Grams to Moles 4. Calculation from equations Masses of substances /Volumes of gases / Concentration
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of the experiment is to synthesize the butly benzoate by nucleophilic substitution and characterize it by IR spectroscopy. The percent yield of the final product is determined after the synthesis. Procedures: 2.0 mL of 1-bromobutane‚ 3.0 g of sodium benzoate‚ 5.0 mL of water‚ 4 drops of Aliquat 336‚ and a boiling stone were placed in a 50mL round-bottomed flask. The reaction mixture was refluxed for 1 hour and the flask was cooled in a beaker in the water of room temperature. The solid was
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soaps are sodium salts that partially ionize in water and if you saturate the solution with salt‚ the salt will remain dissolved because it is more soluble and the soap will precipitate out because of the hydrocarbon chains. Experiment 31: 2. Sodium carbonate is used because it is basic and is able to deprotonate the compound in the mixture‚ but it is not so reactive as a base like NaOH that it will create a basic mixture. Excess sodium bicarbonate is also relative harmless 4. Sodium methyl sulfate
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helps regulate the body’s temperature and maintains physiological functions. There are many different ways that someone can be hydrated. Typically‚ people think of water but there are other isotonic solutions such as Gatorade‚ coconut water‚ and pure sodium chloride solution (Marques Vanderlei‚ Moreno‚ Marques Vanderlei‚ Pastre‚ de Abreu‚
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Aqueous Solutions Reactions‚ Metathesis (Double Replacement) Reactions and Net Ionic Equations Terrance Shelton Introduction India’s cultural treasure and biggest tourist attraction is slowly losing its magnificent appeal due to decades of acid rain. The walls of the Taj Muhal are composed of a marble-like substance ( CaCO3) that corrodes and eventually crumbles when reacted with acid rain(H2SO4). Not only is the Taj Muhal suffering‚ but also other historic landmarks across the world. This is
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Direct competitive cocaine immunoassay was performed in a transparent high binding 96 well microtiter plate. Each well was coated with 200 µL of 1mg/L anti-mouse IgG in PBS (phosphate buffered saline‚ 10 mM sodium dihydrogen phosphate‚ 70 mM sodium hydrogen phosphate‚ 145 mM sodium chloride‚ pH 7.6). The microtiter plate was left over night for shaking at 750 rpm. Therefore‚ the plate was washed three times with automatic 96-channel plate washer by washing buffer (45 M potassium dihydrogen orthophosphate
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Acids‚ bases and salts : Their definitions in terms of furnishing of H+ and OH- ions‚ General properties‚ examples and uses‚ concept of pH scale(Definition relating to logarithm not required)‚ importance of pH in everyday life; preparation and uses of sodium hydroxide‚ Bleaching powder‚ Baking soda‚ washing soda and Plaster of Paris. Metals and non metals: Properties of metals and non-metals‚ reactivity series‚ formation and properties of ionic compounds‚ basic metallurgical processes‚ corrosion and
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A miser is ever in want. --Greek proverb Preparing to experiment You will be provided with the following materials: Redox Reactions Reactions involving oxidation and reduction processes are very important in our everyday world. They make batteries work and cause metals to corrode (or help to prevent their corrosion). They enable us to obtain heat by burning fuels--in factories and in our bodies. Many redox reactions are complex. However‚ combustion and synthesis (from elements) are
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ST ANDREW’S JUNIOR COLLEGE JC 2 Preliminary Examination CHEMISTRY 9647/03 Higher 2 13 September 2010 Paper 3 Free Response 2 hours Candidates answer on separate paper. Additional Materials: Answer paper‚ Graph Paper‚ Data Booklet READ THESE INSTRUCTIONS FIRST Write your name and civics group on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams‚ graphs or rough working. Do not use staples‚
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fewer luster. Water: Bubble effect ‚ remained stationary. Size was 4mm x 4mm‚ translucent and more luster than the oil. E. Making iodine in water: potassium iodide (KI)‚ and sodium hypochlorite (bleach‚ NaClO). F. Making iodine in oil: mineral oil‚ water‚ potassium iodide‚ and sodium hypochlorite Initially: H2O in center of oil‚
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