The hydrophobic effect is islubility of some ionic compounds in water avoidance
ID: 872097 • Letter: T
Question
The hydrophobic effect is islubility of some ionic compounds in water avoidance of water by nonpolar molecules only present in amphiphilic compounds none of the above all of the above The osmotic pressure of 0.50 M NaCl is 20 atm. The osmotic pressure of 0,40 M AlCl3 at the same temperature would be 16 atm 80 atm 32 atm 12.5 atm Pich the intermoluclecular force MOST responsible for each ofd the following from the list below dipole-dipole dispersion ion-dipole hydrogen bonding Solubility of KCl in water but not vegetable oil Ability of hexane [C6H14] to exist as a liquid Miscribility of High b.p of HF Pressure of alpha-helix structure in some proteins Base-pair structure in DNA Negative delta H for the reaction Na + (g) rightarrow na + (aq) The formation of micelles and biological membranes is best explained by the ion-dipole interaction hydrophobic effect entropy of mixingExplanation / Answer
11. hydrobhobic effect is tedency of nonpolar substance to aggregate in aqueous solution. correct option is b.
12. osmotic pressure ? = CRT, C=conc, R=gas constant, T= temp
for Nacl, 20= 0.50*0.0821*T
T= 20/50*0.0821 = 487.2 K
For the same temp, osmotic pressure of AlCl3= CRT= 0.40*0.0821*487.2= 15.99 = 16 atm
13. d) hydrogen bonding between KCl and H2O
14. a) dipole-dipole
15 d) hydrogen bonding
16 a) dipole-dipole
17, 18 d) hydrogen bonding
20 b) hydrobhobic effect
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