collected by suction filtration. The product was then recrystallized in the presence of 95% ethanol producing long red needles. 0.536g‚ 2.07mmol‚ 158-160°C (160°C lit3)‚ 54.6% recovery. Thin layer chromatography was performed in three different eluents‚ hexane‚ toluene‚ and acetone. The chromatography compared aniline‚ 2‚ 4-dinitrobromobenzene‚ and a sample from the mixture of the two reactants when the reaction first began to take place. Another thin layer chromatography used a product sample an hour after
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alkanes. ......................................................................................................................... [1] (c) Isomerisation of hexane‚ C6H14‚ produces a mixture of structural isomers‚ three of which are shown in the boxes below. (i) Draw‚ using skeletal formulae‚ two other structural isomers of hexane. [2] (ii) Name isomer B. .................................................................................... [1] (iii) Isomers A‚ B and C have different boiling
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Benzophenone’s nonpolar nature makes it insoluble with water (which is polar)‚ soluble with methanol (which is of intermediate polarity) and soluble with hexane (which is nonpolar). This is because generally‚ like dissolves like -- nonpolar will dissolve nonpolar but not polar‚ and vice versa. But note that this is an imperfect science -- you would expect hexane to dissolve faster and more completely than methanol (because of the differing polarities)‚ but the opposite occurred. This may be because of benzophenone’s
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Title of Experiment Extraction of Spinach Date that the Experiment was Performed This experiment was performed on Wednesday‚ September 17th‚ 2014 at 2:45 pm in the St Ignatius Science Center Laboratory 323. Partners Names Taylor Jackson and Matt D’Angelo. Taylor‚ Matt‚ and I shared the same data. Purpose/Goals/Objectives The purpose of this experiment was for each student to use column chromatography to separate plant pigments from spinach leaves. Some goals and objectives were to
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according to Table 2 was recorded at 70° C. The final sample temperature for the fractional distillation was 79° C. One microliter of sample was injected into the gas chromatograph. “Typical response factors for the possible components are as follows: hexane (1.50)‚ cyclohexane (1.80)‚ heptane (1.63)‚ toluene (1.41)‚ ethyl benzene (1.00).” DISCUSSION Table 1 Simple Distillation Boiling Points | 1st Drop | 67° C | .5 mL | 69° C | 1.0 mL | 71° C | 3.5 mL | 80.5° C | Table 2 Fractional
Free Distillation
Title : Properties of hydrocarbon Objective : 1) To study the properties of hydrocarbons. 2) To determine the unknown samples. Results : Part A : Combustion Compounds Observations Hexane There was orange flame and burned mildly during the burning process. No soots and smoke were produced. C6H14 + 19/2 O2 6CO2 + 7H2O Cyclohexene Orange flame burned vigorously. A small amount of black soot and smoke were produced during the burning process.
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through industrial discharges and also limit the amount present in drinking water. The partition – gravimetric method involves extraction of dissolved or emulsified oiland grease from water by using an extracting solvent. The common solvents used aren-hexane‚ methyl-tert-butyl ether (MTBE)‚ and trichlorotrifluoroethane. Any filterable solvent-soluble substances (e.g.‚ elemental sulfur‚ complex aromatic compounds‚ hydrocarbon derivatives of chlorine‚ sulfur‚ and nitrogen‚ and certain organic dyes) that
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the pigment containing chloroplasts. Upon adding a solvent mixture of hexane and acetone‚ the chlorophyll and carotene pigments can be extracted from the chloroplasts. Further decanting of the dark green fluid from the cloudy light green material will remove impurities from the extracted pigment. To perform thin layer chromatography‚ a dot of the extracted pigments is placed on a (TLC) plate. By using different ratios of Hexane: Acetone as a mobile phase in (TLC) we should be able to determine which
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Experiment VI: Oxidation of Isoborneol with Bleach Purpose: In this experiment‚ Green chemical procedures were applied to oxidize isoborneol to camphor using bleach (NaOCl)‚ rather than the tradition chromium-based oxidizing reagents. The camphor was then purified using the process of sublimation. Procedure: Using a 50-mL Erlenmeyer flask‚ 1.316 g (8.5 mmol) isoborneol and 1.0 mL (17 mmol) glacial acetic acid were stirred vigorously with a magnetic stir plate. A volume of 1.7 mL NaOCl
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Apple is not going to leave Foxconn and they are not going to leave China. Midcul – Wintek‚ an Apple manufacturing partner who ordered their workers to use n-hexane to clean iPhone screens even they knew n-hexane is a toxic chemical that can cause nerve damage and paralysis. There were 137 Wintek workers injured due to the use of u-hexane‚ a fast-evaporating chemical used to polish iPhone screen.
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