Question 1

Which of the following compounds has the lowest dipole moment?

$\mathrm{a.\ CH_3CH_2CH_2CH_3}$

$\mathrm{b.\ CH_3CH_2OH}$

$\mathrm{c.\ CH_3CHO}$

$\mathrm{d.\ CH_3OCH_3}$

Accepted Answer

$\mathrm{CH_3CH_2CH_2CH_3}$

Question 2

Choose the compound below that contains at least one polar covalent bond, but is nonpolar.

$\mathrm{a.\ HCN}$

$\mathrm{b.\ SF_4}$

$\mathrm{c.\ CF_4}$

$\mathrm{d.\ ICl_3}$

Accepted Answer

$\mathrm{CF_4}$

Question 3

Which substance below will have the lowest surface tension?

$\mathrm{a.\ C_6H_6}$

$\mathrm{b.\ (CH_3)_2SO}$

$\mathrm{c.\ CH_3CH_2CH_2CH_3}$

$\mathrm{d.\ H_2S}$

Accepted Answer

$\mathrm{CH_3CH_2CH_2CH_3}$

Question 4

Which molecule exhibits dipole-dipole forces as its strongest intermolecular force?

$\mathrm{a.\ CBr_4}$

$\mathrm{b.\ SO_2}$

$\mathrm{c.\ BCl_3}$

$\mathrm{d.\ I_2}$

Accepted Answer

$\mathrm{SO_2}$

Question 5

Which of the following substances would you predict to have the highest enthalpy of vaporization ($\Delta H_{vap}$)?

$\mathrm{a.\ Xe}$

$\mathrm{b.\ H_2O}$

$\mathrm{c.\ SF_4}$

$\mathrm{d.\ N_2}$

Accepted Answer

$\mathrm{H_2O}$

Question 6

Which of the following substances should have the highest melting point?

$\mathrm{a.\ Ar}$

$\mathrm{b.\ Ne}$

$\mathrm{c.\ Ag}$

$\mathrm{d.\ CO}$

Accepted Answer

$\mathrm{Ag}$

Question 7

Choose the statement below that is TRUE regarding solution formation.

Accepted Answer

A solution will form between two substances if the solute-solvent interactions are of comparable strength to the solute-solute and solvent-solvent interactions.

Question 8

Which is the correct labeling of equations for the graph showing temperature vs. heat for water?

(Sloped = heating, Horizontal = phase change)

$\mathrm{a.\ Sloped: q=mc\Delta T,\ Horizontal: q=m\Delta H}$

$\mathrm{b.\ Horizontal: T=\Delta H^*m,\ Sloped: T=\Delta T^*K*m}$

$\mathrm{c.\ Sloped: q=nC\Delta T,\ Horizontal: q=n\Delta H}$

$\mathrm{d.\ Horizontal: q=mc\Delta T,\ Sloped: q=m\Delta H}$

Accepted Answer

Sloped: $q=mc\Delta T$, Horizontal: $q=m\Delta H$

Question 9

Calculate the boiling point of a 3.5% solution (by weight) of sodium chloride in water. $K_b = 0.512\ ^\circ C\ kg/mol$

Accepted Answer

$100.31\ ^\circ C$

Question 10

Vitamin A$_1$ (Retinol) is:

$\mathrm{a.}$ Insoluble in water and oil

$\mathrm{b.}$ Less soluble in water than oil

$\mathrm{c.}$ Equally soluble in water and oil

$\mathrm{d.}$ More soluble in water than in oil

Accepted Answer

Less soluble in water than oil

Question 11

What intermolecular forces are present in a pure sample of ethanol ($\mathrm{C_2H_5OH}$)?

Accepted Answer

Dispersion, dipole-dipole, and hydrogen bonding

Question 12

The vapor pressure of water is 1.0 atm at 373 K, and the enthalpy of vaporization is $40.7\ \mathrm{kJ\ mol^{-1}}$. Estimate the vapor pressure at temperature 114°C using the Clausius-Clapeyron equation.

Accepted Answer

$0.13\ \mathrm{atm}$

Question 13

Which region of the phase diagram corresponds to the solid phase?

Accepted Answer

The region at low temperature and high pressure

Question 14

Which of the following best describes a miscible pair of liquids?

Accepted Answer

Liquids that mix in all proportions

Question 15

A pitcher contains 2 liters of water at 25°C. The vapor pressure of water alone is 23.8 mm Hg at 25°C. If 1.5 moles of cherry Kool-Aid are added, what is the new vapor pressure of water? (Assume Kool-Aid is nonvolatile and does not dissociate.)

Accepted Answer

The vapor pressure decreases due to the presence of solute, calculated using Raoult's Law.

Intermolecular Forces, Phase Changes, and Solutions: General Chemistry Study Guide

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