color‚ and odor were noted through simple observation. Miscibility of the test compounds were noted through color change or a warming effect. Flammability was tested by igniting 3-5 drops of the sample in a small evaporating dish. Baeyer’s test and Bromine test were used for tests for active unsaturation. Aromaticity of the compound was determined through nitration. Oxidation was tested by introducing 8 drops of 2% KMnO4 solution and 3 drops of 10% NaOH solution to 4 drops of the sample organic compound
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The reaction produced very low yield of 6.3% due to the nature of the reaction and the speed at which iodine reacts. The purity of E-Stilbene could have been increased by allowing the reaction to perform longer and to use a faster reactant such as Bromine. Introduction: In this experiment a Wittig
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CLASSIFICATION TESTS A. Acids There are relatively few suitable tests for carboxylic acids. Classification is based mostly upon solubility tests. If the compound is water soluble‚ test the aqueous solution of your compound with pH paper (also check the pH of the original water). If the compound is water-insoluble and it dissolves in 5% (1.5M) sodium hydroxide and 5% NaHCO3 solutions as performed in your solubility tests‚ it can be classified as a carboxylic acid. Establish an equivalence value
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an unmeasured excess of KBrO3 will be added to an acidified solution of the standard potassium bromate till the faint yellow color appears. This excess of bromine can be determined iodometrically with standard thiosulfate solution. The ascorbic acid is oxidize by air so the titration should be performed quickly. + Br2 → + 2Br- + 2H+ The bromine or iodine used in titration is generated by adding an excess amount of KBr or KI to an acidified solution of the sample according to the following reaction:
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Question 1 0 out of 2 points When electricity is passed through molten potassium bromide‚ two simpler substances‚ potassium and bromine‚ are produced. Therefore‚ potassium bromide Selected Answer: has less mass than the resulting potassium and bromine do. Correct Answer: cannot be an element. Question 2 2 out of 2 points Which of the following parts (postulates) of Dalton’s atomic theory has been modified in light of later discoveries? Selected
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In 1974 scientists warned that certain industrial chemicals‚ e.g.‚ chlorofluorocarbons (CFCs) and to a lesser extent‚ halons and carbon tetrachloride‚ could migrate to the stratosphere. There‚ sunlight could free the chlorine or bromine atoms to form chlorine monoxide or other chemicals‚ which would deplete upper-atmospheric ozone. A seasonal decrease‚ or "hole‚" discovered in 1985 in the ozone layer above Antarctica was the first confirmation of a thinning of the
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Old Dominion University ORGANIC 214 Alkene Addition Submitted by: Alkene addition: Bromination of (E) Stilbene Introduction: In this lab we used the greener approach‚ which involves the addition of bromine across a double bond. When bromine reacts with E-stilbene (trans-1‚2-diphenylethene)‚ two new chiral carbons are created from the sp2 carbons‚ therefore 3 different dibrominated stereoisomers are possible: meso-(1R‚2S)‚ or the raceminc mixture-(1R‚2R) or (1S‚2S)-dibromo-1‚2-diphenylethane
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Maleic anhydride underwent the Dials-Alder reaction with distilled cyclopentadiene as the dienophile. The reaction was a cycloaddition which produced cis-Norbornene-5‚6-endo-dicarboxylic Anhydride surface. (1) Product one had a mass of 9.351 grams and product two had a mass of 9.572 grams. The theoretical yield was found to be 10.047 grams‚ which makes the percent yield to be 93.07%. Melting Points were found to confirm the purity of the product. Product one had a melting point of 163.7-164
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ONE-SCHOOL.NET Short Notes: Form 5 Chemistry Rate or Reaction Calculation Rate of Reaction (Average Rate) Rates of reaction = Quantity change of reactants/products Total time for the reaction If the quantity change is immeasurable Rates of reaction = 1 Total time for the reaction Find the Rate From a Graph Average Rate Rates At an Instant The rate of reaction is equal to the slope of the graph The rate of reaction at an instant‚ t‚ is equal to the of quantity against
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MONTREAL PROTOCOL: The Montreal Protocol on Substances That Deplete the Ozone Layer (a protocol to the Vienna Convention for the Protection of the Ozone Layer) is an international treaty designed to protect theozone layer by phasing out the production of numerous substances believed to be responsible forozone depletion. The treaty was opened for signature on September 16‚ 1987‚ and entered into force on January 1‚ 1989‚ followed by a first meeting in Helsinki‚ May 1989. Since then‚ it has undergone
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