Question 1 The model for the environment of aqueous solutions can be adapted for non- aqueous solvents such as methanol and dmf. Consider figure 1, one of the models can represent methanol and the other dmf. Suggest which model best suits which solvent. Justify your answer making sure to comment on the relative size of each sphere and the interactions which take place in each of them. bulk Disordered region Secondary solvation sphere Primary solvation sphere Metal centre A B Figure 1: Environment of solution Models

Question 1 The model for the environment of aqueous solutions can be adapted for non- aqueous solvents such as methanol and dmf. Consider figure 1, one of the models can represent methanol and the other dmf. Suggest which model best suits which solvent. Justify your answer making sure to comment on the relative size of each sphere and the interactions which take place in each of them. bulk Disordered region Secondary solvation sphere Primary solvation sphere Metal centre A B Figure 1: Environment of solution Models

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter12: Solutions

Section: Chapter Questions

Problem 12.87QE

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It has been observed experimentally that the AHpolution for methanol as solvent and dimethylsulfoxide (DMSO) as solute is negative. The structures of these compounds are given below. H. H A H3C "CH3 DMSO (dimethylsulfoxide) Methanol Please answer these questions in order to explain this fact: What IMFS are there between methanol molecules and other methanol molecules? Draw a diagram. What IMFS are there between DMSO molecules and other DMSO molecules? What IMFS are there between methanol molecules and DMSO molecules? Draw a diagram. If AHsolution for dissolving DMSO in methanol is negative, what does this say about the energy released in mixing methanol and DMSO molecules (AHmixing) as compared to the energy required in separating solute molecules from each other (AHsolute) and separating solvent molecules from each other (AHsolvent)? 26
1. Using dashed lines to represent the intermolecular interactions, draw, name, and include partial charges (if any) for the strongest intermolecular attraction that occurs between silica gel and the following molecules: silica gel representation HO OH Si O O !.. ...... (i) methyl salicylate a. O Silica gel has a polymeric structure; use the structure provided above to represent silica gel for this question. OH 2. Classify a 95% ethyl acetate/hexane solvent system as polar or non-polar, and explain how it helps to move 9-fluorenone (ii, above) up a TLC plate. provided to answer the following questions. HO I 3. A reaction was reported in which compound I was converted into compound II (structures shown below), and the reaction progress was monitored by TLC using a 1:1 hexanes:EtOAc solvent system (Org. Lett. 2006, 8, 4125-4128.). Use the information Be O (ii) 9-fluorenone (iii) isopropylbenzene dy II The reported Ry values for the compounds were 0.44 and 0.80. Use the structures to…
Ionic liquids are a new class of organic salts that are liquids at low temperature(usually < 100 oC) and often said to be ‘‘green’’ solvents as compared to traditionalvolatile organic compounds. Determine the THREE (3) green aspects of ionic liquids.
bOn average, would Earth be wa success -Fing x Course Home X + HSS Website openvellum.ecollege.com/course.html?courseld=155561588HeplD=6b9f9b2f... 2 01 0
ST4D.3 - The vapor pressure of a substance at various mole fractions in a mixture were found to be as follows. Estimate the Henry's law constant [in MPa] for the substance for the particular solvent of this mixture. USE ALGEBRA instead of a graphical approach. Don't forget there's one more data point that isn't listed in the table (the origin). 0.00230.01020.0182 99.7 48.8 |P/КРа 27.7 Type your answer...
In benzene, dimerization occurs with benzene due to hydrogen bonding. In 110 g of benzene, 1.70g of acetic acid is dissolved that increases the boiling point by 0.40 oC. What is the expected degree of association of acetic acid? (Use Kb=2.57 Kg mol-1 )?
ality al, g. on te ew led ed in X= A solution was prepared by dissolving 140.0 g of KCl in 315 g of water. Calculate the mole fraction of KC1. (The formula weight of KCl is 74.6 g/mol. The formula weight of water is 18.0 g/mol.) Express the mole fraction of KCl to two decimal places. View Available Hint(s) Submit 5 ΑΣΦ Part B - Use the definition of molality 001 mol/ka 12 of 33 ? P Pearson Review I Constants I Periodic Table A solution was prepared by dissolving 140.0 g of KCl in 315 g of water. Calculate the molality of KC1. (The formula weight of KCl is 74.6 g/mol. The formula weight of water is 18.0 g/mol.) Express the concentration of KCl in molality to two decimal places. ▸ View Available Hint(s) >
HSS Website X urse Home 5158&HEPID=6b9f9 b2f... 2 010 8 of 21 Review I Constants I Periodic Table actions. Part A 2AuCls (aq) 3Ni(s)3NIC!2 (aq) + 2Au(s) Express your answer as a chemical equation. Identify all of the phases in your answer. ΑΣφ ? Submit Request Answer Part B 2KI (aq) Br2 (1)-2KBr(aq) + I2 (s) Express your answer as a chemical equation. Identify all of the phases in your answer. ΑΣ P Pearson 019 Pearson Education Inc. All rights reserved. | Terms of Use | Privacy PolicyI Permissions Contact Us II F8 F5 F6 F7 F9 F10 F11 F12 & ) 6 7 8 9 0 delete Y U O P II +
ng and lear X O water treatment systems - Forkly X akeAssignment/takeCovalentActivity.do?locator=assignment-take [Review Topica] [References] Use the References to access important values if needed for this question. The common laboratory solvent diethyl ether (ether) is often used to purify substances dissolved in it. The vapor pressure of diethyl ether , CH3CH,0CH,CH3, is 463.57 mm Hg at 25 °C. In a laboratory experiment, students synthesized a new compound and found that when 5.823 grams of the compound were dissolved in 156.3 grams of diethyl ether, the vapor pressure of the solution was 456.57 mm Hg. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight of this compound? diethyl ether =CH,CH,OCH,CH3= 74.12 g/mol. MW g/mol Submit Answer Retry Entire Group 9 more group attempts remaining ed 8:43 PM 11/17/202 Q
Calculate the mass of O, that is dissolved in the water inside a 100 L home aquarium at 297 K? Atmospheric pressure is 1.01 bar, the Henry's law constant (kH) for O, at 297 Kis 1.33x10 mol L- bar, the molar mass of O2 is 32.00 g mol', and the atomosphere is 20.95 % O2 O 4.28 g O 2.04x10-2g O 0.898 g O 4.28x10-2g O 8.98 g
10-44 Determine the liquidus temperature, soli- dus temperature, and freezing range for the following NiO-MgO ceramic compositions: (a) NiO-30 mol% MgO; (b) NiO-45 mol% MgO; (c) NiO-60 mol% MgO; and (d) NiO-85 mol% MgO. [See Figure 10-8(b).] 2800 2600 2400 L+S 2200 (Ni, Mg)O 2000, 'NiO 20 40 60 80 MgO Mole percent Mg0 (b) Figure 10-8(b) The equilibrium phase diagram for the NiO-MgO system. (Repeated for Problems 10-44, 10-50, 10-53, 10-57, and 10-71.) Temperature (°C)
倒 V OWLV2 | Online teaching and lea X -cnow-owl.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator=assignment-take [Review Topics] [References] pts 2req Use the References to access important values if needed for this question. The following information is given for benzene, CH6, at latm: boiling point =80.1 °C HV (80.1 °C) = 30.7 kJ/mol vap pts 2req specific heat liquid = 1.74 J/g°C pts 2req At a pressure of 1 atm, kJ of heat are needed to vaporize a 41.4 g sample of liquid benzene at its pts 2req normal boiling point of 80.1 °C. 1 pts 2req Submit Answer Retry Entire Group 4 more group attempts remaining 1 pts 2req 1 pts 2req 1 pts 2req 1 pts 2req 1 pts 2req sid 国