Which of the three methods, (Use of Separatory Funnel, Decantation or Use of Pasteur Pipette) do you believe is most suitable for transferring large volumes of liquid mixtures and why?
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Which of the three methods, (Use of Separatory Funnel, Decantation or Use of Pasteur Pipette) do you believe is most suitable for transferring large volumes of liquid mixtures and why?
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- Why would industry prefer to purify solids by sublimation or zone refining rather than recrystallization? (Hint: is there anything wasteful about recrystallization)An ideal property of a solvent to be suitable for recrystallization of a solid sample is: Group of answer choices To have a high boiling point. To dissolve the solid at room temperature but not in cold temperature. To react with the solid to be recrystallized. To dissolve the solid at the solvent's boiling temperature but not at room or cold temperature.A chemistry student wishes to extract 2.34 g of compound X from 15 mL of an aqueous mixture. She has two solvents available with the following characteristics: Solvent Solubility of X in 100 mL of solvent Нехane 36.92 Chloroform 28.33 Water 16.52 However, the student only has enough hexane (exactly 10 mL) for one extraction. On the other hand, she has enough chloroform (exactly 20 mL) to perform either 1 extraction with 20 mL or 2 sequential extractions with 10 mL each.
- What limitations are encountered in the apolication of sublimation as a general method of purification?X Particulate Electrical Forces Unit Test - Profile 1- Microsoft Edge https://www.connexus.com/assessments/learnosity.aspx?idAssessment=1867963&idWebuser=3723941&idSection=D1554684&idHtmllet=D12228907 Particulate Electrical Forces Unit Test Particulate Electrical Forces Unit Test Water exhibits hydrogen bonding. Which option describes what this indicates about water? (1 point) Water will generally require less energy for a phase change compared to a similar substance without hydrogen bonds. O Water will generally have a lower boiling point compared to a similar substance without hydrogen bonds. O Water will generally have a lower melting point compared to a similar substance without hydrogen bonds. Water will generally require more energy for a phase change compared to a similar substance without hydrogen bonds. Type here to searchHeating a solid until it passes directly from the solid phase into the gaseous phase. Separating a liquid from an insoluble solid sediment by carefully pouring the liquid from the solid without disturbing the solid. The process of vapor returning to the solid phase without a liquid phase in between. Heating a mixture to vaporize a volatile liquid component to make the remaining component dry. Separating a solid from a liquid using a porous material, such as paper, charcoal, or sand, as a filter. Using a solvent to selectively dissolve one or more components from a solid mixture. Answer Bank extraction filtration decantation deposition sublimation evaporation
- 1/3 of its capacity. If the volume of the mixture before distillation was 70ml and the percent of recovery was 66%, what is the volume of distilled liquid: ) 46.2ml 10.6ml 58ml 94ml Most organic substances are safe for health which can be safely contactedWhich of the following statements is true when considering temperature during a recrystallization? More than one answer may be correct. Using ice to cool the sample will speed up the crystallization process so that large crystals will be formed. It is important that the sample is dissolved in just enough hot solvent. O Ideally the hot solvent used will keep the impurities dissolved OR not dissolve them at all. Enough cold solvent should be added to dissolve the sample BEFORE heating it past its boiling point.10. What is a supercritical gas? What is the function of a modifier?. 11. What are some characteristics that make supercritical fluid extraction
- 1. To determine the melting point of aspirin, Gerald placed the sample in a capillary tube tied to a thermometer and heated them in an oil bath. Which constitute the system and the surroundings? a.system: aspirin, thermometer, oil, alcohol lamp; surroundings: Gerald b.system: aspirin; surroundings: thermometer, oil, alcohol lamp c.system: aspirin, thermometer, oil; surroundings: alcohol lamp d. system: aspirin, thermometer; surroundings: oil, alcohol lamp 2. Which of the following processes is exothermic, given the following: N2(g) + 2O2(g) → N2O4(l) ΔHo = 9.67 kJ mol-1N2(g) + 2O2(g) → 2NO2(g) ΔHo = 67.70 kJ mol-1 a.2NO2(g) → N2O4(l) b.2N2(g) + 4O2(g) → 2N2O4(l) c.N2(g) + O2(g) → N2O4(l) +NO2(g) d.(1/2)N2(g) + O2(g) → NO2(g)Why is fractional distillation more efficient than simple distillation when purifying liquid mixtures?7.Factors to consider in the selection of appropriate methods in specific gravity determination, excepta.Densityb.Polymorphismc.Physical form of the solidd.Solubility in water or the other liquid8.Specific gravity of a solid in flotation method is compared indirectly with a liquid known specific gravity. When the solid will neither sink or rise in the liquid, the specific gravity of the solid is different as the liquid.a.The first statement is correctb.Both statements are incorrectc.Both statements are correctd. The second statement is correct