A) Water is an excellent solvent for polar molecules ch of the following stateme
ID: 147752 • Letter: A
Question
A) Water is an excellent solvent for polar molecules ch of the following statements about water is incorrecet? atwaer has a concentration of approximately 55,5 M ms pointed toward the ions D) Non-polar molecules do not dissolve in water, but form a separate phase otside E) ato ons are solvated by shells of water molecules oriented with their hydrogen Amphiphili exposed to the water (solvent) and the non-polar groups c detergents often form micelles with the polar groups on the outside sequestered in the interior 26. The strongest non-covalent interactions are: A) ionic interactions B) hydrogen bonds C) dipole-dipole interaction D) London dispersion forces E) van der Waal forces 27. Which of the following is the best explanation for the hydrophobic effect? A) It is caused by an affinity of hydrophobic groups for each other B) It is caused by the affinity of water for hydrophobic groups C) It is an entropic effect, caused by the desire of water molecules to increa entropy by forming highly ordered structures (called clathrates) around the hydrophobic groups D) It is an entropic effect, caused by the desire of water molecules to incr entropy by excluding hydrophobic groups, which they must otherwise sur highly ordered structures (called clathrates) E) It is an entropic effect caused by the desire of hydrophobic groups to their entropy by associating with other hydrophobic groups 28. is exceptionally soluble in water due to the formation of hyd NaCl ) benzene C) sodium palmitate D) ethanol E) oxygen 29. In water solvent, globules of up to several thousand amphiphil led arranged with the hydrophilic groups on the surface and the hExplanation / Answer
Answer 25-(c), water is polar molecule cintain cation and anion both thus dissolve polar compounds. In Nacl ,cation part of salf is stabilized by anion of water while anion part stabilize by cation part of water.
Answer-26 (b) strongest non covalent interation is hydrogen bond .it has somewhat similarity with electrostatic bond. Hydrogen atom bounded to high electronegative atom like O, F ,Cl. Intermolecular hydrogen boding result in boiling point of water to 100°C
Answer 27- hydrophobic effect is entropic effect in which entropy is decreased due to aggregation of non polar solvent in polar solvent.
Answer 28(d) - Ethanol is soluble in water because it makes hydrogen bond with water molecules.
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