WorksheetsIntermolecular Forces and Properties Review
Total questions: 22
Worksheet time: 29mins
Which of the following substances has the lowest boiling point?
H2
Ne
CO
NH3
Based on these structures, which isomer of 1, 2-dichloroethylene has the higher boiling point, and why?
Isomer 1, because it has a molecular dipole, while isomer 2 does not
Isomer 1, because its molecules are more compact than those of isomer 2
Isomer 2, because it forms hydrogen bonds, while isomer 1 does not
Isomer 2, because its molecules are less polarizable than those of isomer 1
Based on the information in the table above, which of the following best explains why ethylene glycol has a lower vapor pressure than 1-propanol?
Ethylene glycol is less polarizable and has weaker dispersion forces than 1-propanol.
Ethylene glycol has a larger molar mass than 1-propanol.
Ethylene glycol forms more hydrogen bonds than 1-propanol.
Ethylene glycol has weaker dipole-dipole forces than 1-propanol.
Which solid, CS2(s) or CCl4(s), has the higher melting point, and why?
CS2(s), because CS2 molecules are more polarizable than CCl4 molecules
CS2(s), because C−S bonds are stronger than C−Cl bonds
CCl4(s), because CCl4 molecules are more polarizable than CS2 molecules
CCl4(s), because C−Cl bonds are stronger than C−S bonds
The structure of a-Si a form of silicon commonly used in the manufacture of LCD screens, is shown above.
Based on the diagram above, which of the following can be concluded about a-Si?
It is an amorphous network solid.
It is an amorphous molecular solid.
It is a crystalline network solid.
It is a crystalline molecular solid.
Which of the following correctly lists the substances HCN, N2, HF in order of increasing intermolecular forces?
HCN < N2 < HF
N2 < HCN < HF
HF < N2 < HCN
N2 < HF < HCN
A mixture containing 2.0mol CH4 (g), 4.5mol O2 (g), and
3.5mol Ne (g) exerts a total pressure of 0.80 atm.
What is the partial pressure of the CH4 (g)?
0.16 atm
0.40 atm
0.64 atm
0.80 atm
A sample of Ar (g) is contained in a cylinder with a moveable piston at an initial temperature of T1. The volume of the sample is decreased from 4.5 L to 1.5 L while the pressure is held constant, as shown in the diagram above.
What is the final temperature of the argon gas?
6T1
3T1
T1
3T1
Assuming constant n and T, which of the following graphs correctly represents the relationship between P and V for an ideal gas?
A research scientist measures the pressure of a sample of NH3(g) at 300 K and observes that it is lower than the pressure calculated using the ideal gas law.
This deviation in pressure most likely results from the:
relatively small molar mass of NH3
low density of the NH3 sample
attractive forces among the NH3 molecules
nonzero volumes of the NH3 molecules
Under which of the following conditions is CO(g) most likely to deviate from the ideal gas law?
0.50 atm and 100 K
0.50 atm and 500 K
25 atm and 150 K
25 atm and 500 K
Which of the following describes the correct procedure to prepare 2.0 L of 0.50M NH4Br(aq)? (The molar mass of NH4Br 98 g/mol.)
Add 49 g of NH4Br(s) 2.0 L of distilled water.
Add 98 g of NH4Br(s) 2.0 L of distilled water.
Dissolve 49 g of NH4Br(s) in a small amount of distilled water and dilute to 2.0 L.
Dissolve 98 g of NH4Br(s) in a small amount of distilled water and dilute to 2.0 L.
Which of the following solutions contains the greatest number of moles of Cl− ions?
20 mL of 0.20 M LiCl
15 mL of 0.10 M NaCl
10 mL of 0.25 M MgCl2
15 mL of 0.20 M CaCl2
Which of the following diagrams best represents a solution of Na3PO4 in water? (Water molecules are not shown for simplicity.)
A student performs a distillation of a 1:2 mixture of two straight-chain hydrocarbons, heptane (C7H16) and octane (C8H18). During the distillation, the student collects fractions of distillate over three volume ranges. These fractions, labeled A, B, and C, are indicated on the distillation curve above.
Based on the curve, what is the most likely composition of fraction A?
Pure heptane
1 : 1 heptane to octane
1 : 2 heptane to octane
Pure octane
Samples of four pure dyes, labeled A through D, are spotted on chromatography paper (a polar material) at the positions indicated in the diagram above. An unknown dye sample, labeled X, is then spotted on a separate piece of chromatography paper. Both papers are placed in chromatography chambers containing a small amount of a nonpolar solvent and developed. The developed chromatograms are shown above on the right.
Which of the four dyes is most likely present in sample X?
Dye A
Dye B
Dye C
Dye D
In which of the following solutions are there dipole-induced dipole forces between the two components?
CH3CN in water, H2O
Na2SO4 in water, H2O
CCl4 in pentane, C5H12
I2 in ethanol, C2H5OH
The table above shows the structural formulas for three different compounds.
Which of the following arranges the compounds in order of decreasing solubility in water?
Butane > 1-butylamine > 1-chlorobutane
1-Chlorobutane > butane > 1-butylamine
Butane > 1-chlorobutane > 1-butylamine
1-Butylamine > 1-chlorobutane > butane
Vibrational spectroscopy, which measures transitions between molecular vibrational states, is often used by art conservation scientists to identify the types of pigments used in historical paintings.
Based on the information above, what type of electromagnetic radiation is likely used in vibrational spectroscopy?
X-ray
Ultraviolet/visible
Infrared
Microwave
An electron in a helium atom transitions from a 2p orbital to a 1s orbital. The difference in energy between the two states is 3.40 x 10-18 J.
Which of the following best describes how the energy of the helium atom is affected by the electronic transition?
The energy of the helium atom increases by 3.40 x 10-18 J.
The energy of the helium atom decreases by 3.40 x 10-18 J.
The energy of the helium atom stays the same.
It cannot be determined how the energy of the helium atom is affected without knowing the energy of the photon involved.
Butadiene, C4H6, absorbs strongly in the ultraviolet region of the electromagnetic spectrum.
Calculate the amount of energy, in joules, that a butadiene molecule gains when it absorbs a photon of ultraviolet radiation with a wavelength of 2.17 x 10-7 m.
9.16 x 10 -19 J
4.31 x 10-32 J
4.79 x 10-49 J
2.09 x 10 48 J
A student is tasked with determining the number of moles of CuSO4(aq) in a 200. mL sample of an unknown solution. The student prepares a series of solutions with known concentrations of CuSO4 (aq) and measures the absorbance of each at an appropriate wavelength. These data are used to construct the calibration plot shown above.
If the absorbance of the unknown solution is 0.70, how many moles of CuSO4(aq) does the 200. mL sample contain?
0.030 mol
0.060 mol
0.30 mol
0.60 mol
