Question: Why do noble-gas boiling points increase down the group?
Answer Options:
Increasing dispersion; Increasing dipole-dipole; Increasing ion-dipole; Increasing hydrogen bonding; Increasing ion-ion
Answer: Increasing dispersion interactions
Question: Which of the following statements is true about the process? (gas in insulated container)
Answer Options:
A. The final temperature of the gas will be greater than 25 °C because more work was done by the system in expanding the gas than was done on the system in compressing the gas.
B. The final temperature of the gas will be greater than 25 °C because more work was done on the system in compressing the gas than was done by the system in expanding the gas.
C. The final temperature of the gas will be lower than 25 °C because more work was done by the system in expanding the gas than was done on the system in compressing the gas.
D. The final temperature of the gas will be lower than 25 °C because more work was done on the system in compressing the gas than was done by the system in expanding the gas.
E. The final temperature of the gas will be 25 °C because the gas is returned to the same pressure and volume.
Answer: D. The final temperature of the gas will be lower than 25 °C because more work was done on the system in compressing the gas than was done by the system in expanding the gas.
Question: Which of the following is a form of kinetic energy?
Answer Options:
A. rotation
B. translation
C. vibration
D. heat
E. All of these answers are correct
Answer: E. All of these answers are correct
Question: Which of the following exhibits dipole-dipole intermolecular forces in a pure substance?
Answer Options:
A. CO₂
B. CH₄
C. Ne
D. HCl
E. I₂
Answer: D. HCl
Question: Choose the image that best represents which phase(s) are present at point C (phase change graph).
Answer Options:
A. I
B. II
C. III
D. IV
E. V
Answer: E. V
Question: Which substance has the highest vapor pressure at 298 K?
Answer Options:
Propanol (b.p. 97 °C); Acetone (56 °C); Water (100 °C); Benzene (80 °C); Chloroform (61 °C)
Answer: Acetone
Question: When boiling water on a natural gas (methane) burner, which of the following processes converts chemical potential energy to heat?
Answer Options:
A. The pressure of the natural gas
B. The combustion reaction between methane and oxygen.
C. Breaking the carbon-hydrogen bonds in methane
D. Redox reactions that generate a potential difference
E. Alternating electromotive force
Answer: B. The combustion reaction between methane and oxygen.
Question: Identify the type of solid for sucrose.
Answer Options:
Ionic; Molecular; Covalent-network; Metallic
Answer: Molecular
Question: Which is predicted to have the lowest vapor pressure?
Answer Options:
A. CH₄
B. H₂O
C. NH₃
D. HCl
E. CO
Answer: B. H₂O
Question: Which of the following should exhibit the highest viscosity at 298 K?
Answer Options:
A. HOCH₂CH₂OH
B. CH₃OCH₃
C. CH₃OH
D. CH₃Br
E. CH₂Cl₂
Answer: A. HOCH₂CH₂OH
Question: Ammonia and hydrogen fluoride both have unusually high boiling points due to _____
Answer Options:
(fill-in-the-blank)
Answer: hydrogen bonding
Question: An unknown solid is added to water in a calorimeter. The temperature of the water increases. What does this say about the reaction?
Answer Options:
A. The reaction is exothermic.
B. The reaction is endothermic.
C. The reaction has absorbed heat from the solution.
D. The reaction has released heat to the solution.
E. Both A and D.
Answer: E. Both A and D
Question: Which of the following substances would not exhibit any hydrogen bonding interactions in a pure substance?
Answer Options:
A. HF
B. NH₃
C. CO₂
D. CH₃OH
E. H₂O
Answer: C. CO₂
Question: Which of the following substances would have the greatest dispersion forces?
Answer Options:
A. CH₄
B. Ne
C. CO
D. H₂O
E. I₂
Answer: E. I₂
Question: Which substance has the highest melting point?
Answer Options:
NaCl; Cl₂; NO₂; CH₄; H₂S
Answer: NaCl
Question: As a liquid’s temperature rises, what happens to viscosity and surface tension?
Answer Options:
Visc↑ & ST↑; Visc↑ & ST↓; Visc↓ & ST↓; Visc↓ & ST↑
Answer: Viscosity decreases and surface tension decreases
Question: Which of the following substances would not exhibit any hydrogen bonding interactions in a pure substance?
Answer Options:
A. H₂O
B. HF
C. N(CH₃)₃
D. CH₃CH₂OH
E. CH₃NH₂
Answer: C. N(CH₃)₃
Question: As a system reaches thermal equilibrium, ______ of high to low ______ has been transferred from areas
Answer Options:
A. solute; concentration
B. temperature; thermal energy
C. thermal energy; temperature
D. matter; temperature
E. work; energy
Answer: C. thermal energy; temperature
Question: Which one of the following processes is exothermic?
Answer Options:
A. Making coffee
B. Baking a cake
C. Burning wood in a campfire
D. Photosynthesis
Answer: C. Burning wood in a campfire
Question: Which of the factors contributes to a low viscosity of a liquid?
Answer Options:
A. High boiling point
B. Hydrogen bonding
C. Compact molecular shape
D. Low temperature
E. High molar mass
Answer: C. Compact molecular shape
Question: Which phase change is exothermic?
Answer Options:
Sublimation; Vaporization; Condensation; Melting
Answer: Condensation
Question: The predominant intermolecular force in Na⁺(aq) is _____
Answer Options:
Ionic bonds; Dipole-dipole; Ion-dipole; Dispersion; Covalent bonds
Answer: Ion-dipole interactions
Question: Which of the following pairs correctly ranks the viscosity of the compounds?
Answer Options:
A. H₂O < CCl₄
B. C₅H₁₂ < C₆H₁₄
C. C₂H₅OH < C₂H₆
D. C₈H₁₈ < C₂H₆
Answer: B. C₅H₁₂ < C₆H₁₄
Question: Consider the intermolecular forces present in a pure sample of each of the following compounds: CH₃CH₂CH₂Cl and CH₃CH₂CH₂OH. Identify the intermolecular forces that these compounds have in common.
Answer Options:
(fill-in-the-blank)
Answer: dipole–dipole interactions and London dispersion forces