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- 4. A student prepared a compound. The melting point of the crude product was 42 to 48°C. After purifying the solid for the first time, the melting point was 47 to 51°C. After another purification, the melting point was 50 to 53°C. At this stage, can the student confidently say the product has been completely purified? Justify your answer. iedBalance the following redox reactions, to their simplest form, by supplying the correct coefficients before each compound for #s 1-15. The unknown coefficients of the compounds should be whole numbers. Note: The reactions below are not yet balanced.On the following page are three compounds, 1, 2, and 3, that have been investigated as anti-malarial candidates. Compound 1 is the "parent" molecule, and 2 and 3 are derivatives. Shown next to each molecule is (i) the enthalpy change when it binds to its target, and (ii) the dissociation constant for the molecule/target complex. Consider the structures and answer the following: AH = - 1.2 kcal/mol; Kp = 16 nM OH 1 HO AH = - 6.0 kcal/mol; Kp = 76 nM OH AH = - 5.5 kcal/mol; Kp = 0.5 nM OH 3 (i) What is the difference among 1, 2, and 3?
- Which one of the following substances is more likely to dissolve in CC14? O CH3CH2OH O H2O O NH3 O C10H22 O NaClTom, an analytical chemist, bought a bag of decaffeinated coffee from a grocery store. However,Tom suspected that he might have received regular coffee and therefore decided to analyze hiscoffee for caffeine. In the lab, he took 0.5 mL of the brewed coffee and diluted it in water tomake a 100.0 mL solution. He performed four analyses and found the concentrations to be 4.69,3.99, 4.12, and 4.50 mg/L, respectively. (Assume the density of all solutions is 1.000 g/mL,1oz= 28.35 mL).(a) Report the concentration (in mg/L) of caffeine in the brewed coffee using the format asaverage ± standard deviation. (Note this is not the concentration in the diluted solution.)(b) Look up the caffeine content of regular vs. decaffeinated coffee. Do you think that Tom wasgiven the wrong type of coffee?(c) Caffeine intake of 300 mg per day reportedly has no adverse effects in the vast majority ofthe adult population. If Tom drinks 3 cups (8 oz/cup) of this coffee daily, is his intake withinthis known safe…The thiourea in a 1.455-g sample of organic material was extracted into a dilute H2SO4 solution and titrated with 37.31 mL of 0.009372 M Hg2+ via the reaction. Calculate the percent (NH2)2CS (76.12 g/mol) in the sample. 4 (NH2)2CS + Hg2+ → [(NH2)2CS]4Hg2+
- Iron(III) Chloride Test Saved BIIIU X2 | X² | → Ix Normal Alcohol FeCl3 test color Ethanol 2-Propanol 2-Methyl-2-propanol Cyclohexanol Phenol N/A Unknown ll !!Activity 1. Strength of IMFA and Physical Properties of Covalent Compounds For each pair of molecules, identify the one with the higher boiling point (BP), melting point (MP), viscosity (V), surface tension (ST) and vapor pressure (VP). Briefly explain your choice. BP MP ST VP H H-C-H CI Methane, CH carbon tetrachloride, CCI4 S H `H H' H. Dihydrogen sulfide, H2S water, H2O HH H-C--O--H H--C-C-ô--H H H ethanol, CH3CH2OH Methanol, CH3OH H Ö: нон H-C--C=ÖH H--C-Ć--Ċ-H H Acetic acid, CH3COOH acetone, CH30CH3 Adapted from Punzalan and Monserat (2016)Consider the properties of sodium carbonate (Na2CO3), potassium carbonate (K2CO3), andsodium hydroxide (NaOH). How do they differ by pKa? Nucleophilicity? Solubility?
- CaC2O4 + KMnO4 (in the presence of H2SO4)What's More Activity 1. Strength of IMFA and Physical Properties of Covalent Compounds For each pair of molecules, identify the one with the higher boiling point (BP), melting point (MP), viscosity (V), surface tension (ST) and vapor pressure (VP). Briefly explain your choice. BP MP V. ST VP C H CI-C-C CI carbon tetrachloride, CCl Methane, CH. H. H. H. Dihydrogen sulfide, H-S water, H-O H. H. C- H- H. H. ethanol, CH.CH:OH H. Methanol, CH,OH н с с ОН H C C-C-H H. Acetic acid, CH.COOH acetone. CHOCH Adapted from Punzalan and Monserat (2016)A. How CO2 can be converted to value-added products mediated by ionic liquids such as CO2 hydrogenation, HCOOH, CH4 and other hydrocarbons, HCOOCH3 and carbonates etc?