Please answer e-h 11. Determining the molecufar contributions to the hydrophobic
ID: 716072 • Letter: P
Question
Please answer e-h
11. Determining the molecufar contributions to the hydrophobic effect-Enthalpic effects: al In general, does a nonpolar molecule have stronger interactions with another nanpolar moletule, or with a water molecule? A nonpolar molecule would experience a stronger cling to: D another nonpolar solute D a water molecule b) As nonpolar molecules cluster together in an aqueous solution, would the change in how the nonpolar solute interacts with its new neighbors contribute an Dincrease (+AH) or a D decrease (-AH) in enthalpy? ) Which has stronger intermolecular interactions, D a water molecule interacting with a nonpolar solute, or D a water molecule interacting with a water molecule? d) Water interacting only with other waters form about four hydrogen bonds with its neighbors. Researchers were somewhat surprised to find that, at 25" C, a water molecule at the nonpolar interface interfacial water) forms the same average number of hydrogen bonds (4) to other waters! Even in the presence of gt the nonpolar solute, water can find enough nearby water to hydrogen bond with. Given hydrogen bonding is the main interaction each water participates in, do you expect the enthalpy o water to change as nonpolar molecules cluster together in an aqueous solution? Yes No e) Enthalpy conclusion: When nonpolar solutes coalesce in water, it is expected that the overall enthalpy would increase significantly, decrease significantly, stay about the same(select all possibiities based on your answers abovel. f) Reality check: is your conclusion consistent with the data in Table 2-2 above? Explain Yes No 8l The hydrophobic effect is caused by the system minimizing the number of waters at a nonpolar interface, as these interfacial waters have restricted motion. Is this conclusion supported by the data in Table 2.2? Give the evidence you use to draw your conclusion. h) The term hydrophobic effect a bit of a misnomer. Based on your conclusion, why is that?Explanation / Answer
a. Hydrophobic effect is observed tendency of non polar substance to aggregate in an aqueous solution and exclude water molecules. Therefore a non polar molecules will strongly cling to non polar solute.
b. The non polar solute molecules are held by weak Vanderwaals forces, hence the enthalpy needed to break the interaction is small.The polar solvents molecules are held by strong dipole moment and hydrogen bond. Hence, the overall enthalpy change during the whole reaction is large and positive.
c.The water molecules interacting with the other water molecules is having much stronger intermolecular interaction due to the presence of hydrogen bond and Coulombic force between the hydrogen atoms.
e. When non polar solutes coalesce in water, there is significant increase in the enthalpy.
f.There is no table (table 2.2) described in the above question, so answer to this question is not possible.
g.Again, the table is Missing, so answering the question is not possible.
h.The word, misnomer meaning something asserted not to be true, or a myth. Hydrophobic effect is not misnomer because the the non polar molecules do associate together or fold up in the aqueous solution.