Question 13.14,15 (except c),16,18 In making An increase in entropy favors mixin

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Question 13.14,15 (except c),16,18

In making An increase in entropy favors mixing. Indicate whether each statement is true or false: NaCl dissolves in water but not in benzence (C_eH_6) because benzene is denser than water. NaCl dissolves in water but not in benzene because water has a large dipole moment and benzene has zero dipole moment. (c) NaCl dissolves in water but not in benzene because the water-ion interactions are stronger than benzene-ion interactions. Indicate the type of solute-solvent interaction (Section 11.2) that should be most important in each of the following solution: C_8H_18 in toluene (C_2H_8), (b) acetic acid (CH_3CO_2H) in water, SO_2 in acetonitrile (CH_3CN), NaCl in water. Indicate the principal type of solute-solvent interaction in each of the following solutions and rank the solutions from weakest to strongest solute-solvent interaction: KCl in water, CH_2Cl_2 in benzene (C_6H_6), methanol (CH_3OH) in water. An ionic compound has a very positive Delta H_soln in water Would you expect it to be very soluble or nearly insoluble in water? Which term would you expect to be the largest positive number: Delta H_solvent, DeltaH_solute, or DeltaH_mix? When potassium bromide dissolves in water, the solution becomes colder. Is the solution process exothermic or endothermic? why does the solution form? In Equation 13.1. which of the enthalpy terms for dissolv

Explanation / Answer

13.14

a) false density has nothing to do with soubility

b) true, the dipole moment is an indicator of how polar/nonpolar is the substance

c) true, the ion-dipole interction is stronger in water-nacl than benzene-nacl

13.15

a) london dispersion forces are common between nonpolar-nonpolar substance

b) acetic acid in water have dipole-dipole interaction + hydrogen bonding between C=O and H

c) NA

d)NaCl and water hav a ion-polar interaction, have dipole-ion interactions

13.16

a) KCl and water have ion-dipole interaction, they are VERY strong interactions

b) CH2Cl2 and benzene have non dispersion forces, therefore they re very weak interactions

c)methanol and water have dipoloe-dipoloe interaction, it is strong but not that strong as ion-dipole

KCl > methanol > CH2Cl2

13.18

if it becomes colder, heat is being absorbed from the surroudings, therefore the system is absorbing heat, increasing heat content, this must be ENDOTHERMIC

Hmix >>

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