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- 7 Ethanoic acid has a melting point of 17 °C, ethanamide has a melting point of 81 °C, and ethanal has a melting point of -125 °C. Rationalize the differences in melting point between these three compounds.three dimensional structure for 2-Hydroxypropanoic acidFor this statement, answer True or False and explain your answer briefly. Polarity is the only characteristic used in liquid-liquid extraction to isolate a poison from the biological matrix.
- Give answers to these questions. Choose from the options A.The efficacy of salicylic acid as well as its solubility in water as compared to p-hydroxybenzoic acid is greatly affected by what phenomenon? Dipole moment Hydrogen bonding Ionic bonding Hydrophobic effect B.This is the most important CYP 450 isozyme that is responsible for the metabolism of almost 50% of the drugs available in the market CYP 2D6 CYP 2A9 CYP3A4 CYP 1A2 C.Ketones are oxidized into Aldehydes Carboxylic acid Secondary alcohol Unable to oxidized D.G- protein coupled receptors are activated via these secondary messengers, except cAMP DAG IP3 ATP E.The gas use for sterilizing heat labile substances Gluteraldehyde Ethylene oxide Nitrogen AcetyleneWhich of these is true about "hydrophobic effect"? It is caused by an affinity of hydrophobic groups for each other. It is caused by the affinity of water for hydrophobic groups. It caused by the repulsion between hydrophobic groups and water molecules.It is an entropic effect, caused by the tendency of water molecules to avoid forming highly ordered structures by excluding hydrophobic groups. Two of the above are accurate explanations of the hydrophobic effecGive the advantages of using steam distillation in the recovery of an organic liquid from a mixture.
- Why are hexane, cyclohexane, and toluene soluble in ligroin?classify the molecules of interest (i.e. para-aminophenol, acetaminophen, phenacetin) in increasing order of polarity? Rationalize these observations based on molecular interactions.What is Solubility of phenazopyridine in water?acidic media? basic media ?and what is most common solvent?
- Your employer hands you a heterogeneous mixture and asks you to isolate all of thehexane that you can from it. After some analysis, you determine that the mixture contains toluene, hexane,benzoic acid, water, sodium chloride, and sand. Explain how you would isolate pure hexane from thismixture. Remember that you can use techniques such as filtration, extractions, and acid/base chemistrythat we learned earlier in this course in addition to distillation. You may need to look up solubilities and/orboiling points online to solve this problem. You only need to isolate the hexane?The first goal of this study is to isolate the volatile oils and essential oils that give oregano and lemongrass their insecticidal properties. To create a formula for a bug-repellent lotion that makes use of oregano and lemongrass extracts as active ingredients. To identify the optimal concentration of oregano and lemongrass extracts that will have the greatest possible effect on preventing pest infestation. Direction: Explain each of the sentences the title of this research is "Development and utilization of insect-repellent lotion using oregano and lemongrass” this is connected to chemistry. To perfect the formulation of the lotion so that it may be applied to the skin comfortably. To determine the effects that applying an insect repellent lotion containing oregano and lemongrass has on the environment.1: What is the molar concentration of a 4% solution of borax? (sodium tetraborate decahydrate, Na2B4O7·10H2O) Group of answer choices A:1.5 x 10^4 M B:65.8 M C:1.049 M D:0.1049 M 2: Calculate the approximate length of PVA strand assuming that each monomer unit contributes two carbon atom diameters to the length. (1 carbon atom diameter = 154 picometers) Group of answer choices A:5.46 x 10^7 nm B:5.46 m C:308 pm D:5.46 x 10^5 pm 3: Calculate and compare the number of strands of PVA in 1.00 L of 4% PVA and the number of tetrahydroxyborate ions in 1.00 L a 4% solution of borax. Group of answer choices A:Borax has more strands than PVA B:Borax has approx. 409 more ions than PVA strands C:PVA has approx. 409 more strands than Borax ions D:Borax has approx. 209 more ions than PVA strands
