Fill in the circle corresponding to the letter \"A\" on your Scantron Which is n

Question

Fill in the circle corresponding to the letter "A" on your Scantron Which is not a force involved in the dissolution of ethanol (C_2H_5Oh) in water? a) London dispersion (b) dipole-dipole (c) hydrogen bonding (d) ion-dipole Which force is involved in the dissolution of oil into gasoline? (a) London dispersion (b) dipole-dipole (c) hydrogen bonding (d) ion-dipole Which of the following gases should have the largest Henry's law constant (K_H) in water? (a) CO (b) N_2 (c) CH_3CH_3 (d) Ne Determine the solubility of He in water in contact with He gas at a pressure of 2.0 atm and 2 The Henry's law constant for helium in water at this temperature is 3.7 times 10^-4 M/atm. (a) 1.1 times10^-4 M (b) 1.2 times 10^-4 M (c) 1.6 times 10^-4 M (d) 6.4 times 10^-4 M (e) 7.4 times 10^-4 M Which statement is true? (a) increasing the pressure of a gas over a liquid decreases its solubility

Explanation / Answer

(2)

The reason that Ion-dipole forces are absent in ethanol-water mixture is that ethanol doesn't dissociate into ions in aqueous solutions because it is a non-electrolyte, so chances of ion formation and interaction with the dipole water molecules are not there.

(3)

Oil and gasoline both are organic compounds, and don't form ions, and also are not polar, which is the reason that they are not soluble in water. London dispersion forces are only forces which are responsible for dissolution of oil in gasoline, because these forces are practically present in all the molecules.

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