1 PRACTICE EXAM (not all questions pertain to a specific mid-term). This is taken from an earlier final exam. 1. (4 pts) Permanganate ion oxidizes sulfide ion to elemental sulfur (which you should represent as a single S atom) and is reduced to MnO2 in basic solution. In the balanced equation for this reaction‚ which you should determine in the work area‚ how many water molecules and hydroxide ions are needed in the final balanced equation? Work area: # of H2O ____4______ # of OH-
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contain c-c single bonds‚ are saturated‚ and are the least reactive. Alkenes are c=c double bonds‚ more reactive than alkanes‚ and unsaturated. In the next part of the experiment we added bromine to alkenes. This caused an electrophilic halogenation reaction. If the bromine reacted with the alkene the bromine would discolor from orange and turn clear. Experiment Part A) Solubility of Alkanes: 1 mL of nine solvents (water‚ methanol‚ n-butanol‚ ethylene‚ glycol‚ acetone‚ hexane‚ toluene‚ ethyl
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different hydrogen atoms when reacted with bromine under free-radical substitution. The time it took for the bromine color to disappear was used to determine the order of reactivity of the different hydrocarbons. Data and Results The data of the 10 hydrocarbon tubes and the 2 control tubes with bromine and dichloromethane in the two different conditions is listed below in Table 1. As a result‚ the hydrocarbon tubes in light reacted and lost the bromine color quicker than the tubes not in light
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Barium(Ba) 56 137 (+2) Selenium(Se) 34 79 (-2) Radium(Ra) 88 226 (+2) Tellurium(Te) 52 127.6 (-2) `Boron(B) 5 11 (+3‚-5} Flourine(F) 9 19 (-1) Aluminium(Al) 13 27 (+3) Chlorine(Cl) 17 35 (-1) Gallium(Ga) 31 70 (-3) Bromine(Br) 35 80 (-1) Indium(In) 49 115 (-3) Iodine(I) 53 127 (-1) Thallium(Tl) 81 205 (-3) Astatine(At) 85 210 (-1) Carbon© 6 12 (+4) Some More About Elements Lithium [Li]``CAS-ID: 7439-93-2``An: 3 N: 4``Am: [6.941 (2)] g/mol``Group
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Materials * 4x 250ml conical flasks * 2 rubber stoppers * Aluminium foil * Cyclohexane * Cyclohexene * Bromide water * Measuring cylinder Risk assessment risk | level | Precautions taken | Organic compound in eyeor on skin | medium | Glasses‚ lab coatgloves | Inhaling organic compound | high | Fume cabinet | Bromide water in eye or onskin | medium | Glasses‚ lab coatgloves | Laceration from broken glass | low | Minimalizing movement of glassware
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- College of Science‚ University of Santo Tomas‚ Manila ABSTRACT The unknown hydrocarbon sample was differentiated and characterized by the use of three tests. The outcomes of these tests are as follows: Nitration test (negative)‚ Bromine test (positive) and Basic Oxidation test (positive). From these results the unknown sample can be classified as non-aromatic and unsaturated. INTRODUCTION Hydrocarbons are organic compounds that consist of only C and H atoms. They include the
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Task 3: The chemical tests used in order to carry out and collect these results are useful for the simple identification of colourless organic liquids and ones that are often found at the scenes of crime. The first test carried out was the Lucas test which was used to identify a variety of alcohols following the contribution of a given solution‚ from carrying this out I could then identify that primary and secondary alcohols were present with one tertiary alcohol also being present however despite
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Cyclohexanol Organic Chemistry Lab 1 Tuesday 8:00 11/08/11 Paul Jackson Abstract: The goal of this experiment was to form cyclohexene from cyclohexanol through a dehydration reaction. Cyclohexene was successfully synthesized according to the bromine test performed and the IR spectra. There was a percent yield of cyclohexene of 76.1%. Introduction: Alkenes‚ hydrocarbons containing at least one carbon-carbon double bond‚ are important functional groups in natural and synthetic compounds. One
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investigate the reaction between bromine and methanoic acid:- Br2 (aq) + HCOOH (aq) ↓ 2Br- (aq) + 2H+ (aq) + CO2 (g) Bromine in aqueous solution is orange-yellow‚ but all the products and the methanoic acid are colourless. The colour gradually fades as the reaction proceeds. In this experiment we wish to determine the order of the reaction with respect to bromine. By using a concentration of methanoic acid which is 10 times greater than that of the bromine we can assume that the
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85% phosphoric acid and sulfuric acid. Tests for unsaturation were performed adding drops of bromine in tetrachloride and potassium permanganate to four test tubes‚ two containing 5 drops of cyclohexanol(control)‚ and two containing cyclohexene(prepared product. 3 drops of bromine solution changed the product from red to clear within in 5 seconds. The control remained red after 5 drops of bromine were added. Likewise‚ 3 drops of potassium permanganate changed the product from purple to brown
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