substances. Besides‚ I observed that biphenyl‚ butyl acetate‚ glycerol and motor oil are nonpolar substance. These compounds were soluble in hexane. Meanwhile‚ magnesium oxide and sodium bromide did not dissolved in either water nor in hexane. Moreover‚ Iodine and aspirin acted different than what I expected. Iodine is a nonpolar substance but not dissolved in hexane. On the other hand‚ I noticed that aspirin is a nonpolar substance but it did not dissolved in water. Surprisingly‚ I found that some among
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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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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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acids and bases. Part A Benzophenone Test Tube Number | Grams of Benzophenone Used (≈0.0400g) | Soluble‚ Insoluble‚ or Partially Soluble? | #1 (1mL of H2O) | 0.0406g | Insoluble | #2 (1mL of Ethyl Alcohol) | 0.0402g | Soluble | #3 (1mL of Hexane) | 0.0406g | Soluble | Although benzophenone has the ability to form two hydrogen bonds from the two lone pair electrons on the oxygen of the carbonyl group‚ its overall polarity is low‚ making it a nonpolar solvent. Now that we’ve established
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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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results are presented in Figure 1-3 TABLE 1:Characteristics of the materials used in the extraction of B-Carotene from Carrot Quantity Characteristics Shredded carrots 10.0016g Orange solid 95% ethanol 125mL Clear liquid Water 15mL Clear Liquid Hexane 25mL Clear liquid TABLE 2: Summary of B-Carotene Characterization Results Formula C40H56 Density 940.00 kg/m³ Melting Point 180°C) Rf value (cm/cm) 4.75/4.75=1 Absorbance at 449 nm 0.576 TABLE 3: Summary of Our Beta-carotene Sample Rf value (cm/cm)
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oC -83 oC 161 oC - 163 oC (at 4 mm) Very slightly soluble in water‚ soluble in organic solvent Ethyl Acetate C4H8O2 88.11 0.897 -83.6 oC 77.1 oC Slightly soluble in water (~8.3g/100mL‚ 20 oC)‚ very miscible with alcohol‚ ether‚ acetone‚ benzene. Hexane C6H14 86.18 0.6548 -95 oC 69oC Immiscible with water Dichloro-methane CH2Cl2 84.93 -97 oC 40 oC 1.325 Slightly soluble in water (~1.3g/100mL‚ 20 oC)‚ very miscible with most organic solvent. Hazard 1. Ferrocene is highly flammable and it is harmful
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mixture was left to stand for an hour with stirring before the crude product was collected with vacuum filtration.The product was air dried for a couple of minutes then boiled with hexane (20 mL) leaving behind a brown- black gummy substance. The product was then decolourised with activated charcoal and recrystallized from hexane to give dark orange crystals (0.51 g‚ 27%‚ m.p. 84°C; lit. m.p. 81-86 ºC). A TLC plate was used to compare the ferrocene‚ the crude product and the recrystallised product. The
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Developing Fuels Revision questions and suggested answers 1. Define ΔHfθ and ΔHcθ ΔHfθ the enthalpy change when 1 mole of a compound is formed from its constituent elements in their standard states measured under standard conditions ΔHcθ the enthalpy change when 1 mole of a compound undergoes complete combustion measured under standard conditions 2. Write an equation for the enthalpy of formation of butane C4H10 4C(s) + 5H2(g) C4H10(g) 3. Write an equation for the
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lab; however‚ we were able to get through most of it‚ and were only missing the adulterant. The first step to identify our unknown samples was to create TLC plates that should results with each known compound and 95% hexane: 5% ethyl acetate‚ 90% hexane: 10% ethyl acetate‚ or 80% hexane: 20% ethyl acetate. Each student was designated one of these concentrations of solvent as well as visualization method. After we tested and calculated the Rf values of each of the following known compounds with each
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