Question: Which of the following has the lowest boiling point?
Answer Choices: A. C₅H₁₂ B. C₇H₁₆ C. C₉H₂₀ D. C₁₁H₂₄ E. C₁₃H₂₈
Answer: A. C₅H₁₂
Question: Which of the following substances is not a gas at 298 K and 1 atm?
Answer Choices: A. CO₂ B. CH₃OH C. C₂H₆ D. O₂ E. C₃H₈
Answer: B. CH₃OH
Question: Which best explains why the trend in noble gas boiling points increases down the group?
Answer Choices: A. increasing dispersion interactions B. increasing dipole-dipole interactions C. increasing ion-dipole interactions D. increasing hydrogen bonding interactions E. increasing ion-ion interactions
Answer: A. increasing dispersion interactions
Question: Which gas law explains why a balloon expands when heated?
Answer Choices: A. Boyle’s Law B. Charles’s Law C. Avogadro’s Law D. Dalton’s Law
Answer: B. Charles’s Law
Question: The predominant intermolecular force found in Na⁺(aq) is _____
Answer Choices: A. ionic bonds B. dipole-dipole interactions C. ion-dipole interactions D. dispersion forces E. covalent bonds
Answer: C. ion-dipole interactions
Question: Identify table sugar (sucrose) as one of the following types of solids.
Answer Choices: A. ionic B. molecular C. covalent-network D. metallic
Answer: B. molecular
Question: Which one of the following phase changes would be exothermic?
Answer Choices: A. sublimation B. vaporization C. condensation D. melting
Answer: C. condensation
Question: Which of the following best represents an endothermic process?
Answer Choices: A. Water freezing B. Ice melting C. Condensation of steam D. Combustion
Answer: B. Ice melting
Question: Which of the following elements is most electronegative?
Answer Choices: A. Na B. O C. F D. Cl
Answer: C. F
Question: How many hydrogen bonds can a single water molecule form?
Answer Choices: A. 1 B. 2 C. 3 D. 4
Answer: D. 4
Question: Which of the following substances would have the highest vapor pressure at 298 K?
Answer Choices: A. propanol (b.p. = 97 °C) B. acetone (b.p. = 56 °C) C. water (b.p. = 100 °C) D. benzene (b.p. = 80 °C) E. chloroform (b.p. = 61 °C)
Answer: B. acetone
Question: Which of the following straight-chain hydrocarbons will have the highest viscosity at 298 K?
Answer Choices: A. C₅H₁₂ B. C₆H₁₄ C. C₇H₁₆ D. C₈H₁₈ E. C₉H₂₀
Answer: E. C₉H₂₀
Question: Consider the intermolecular forces present in a pure sample of each of the following compounds: CH₃CH₂OCH₂CH₃ and CH₃CH₂CH₂OH. Identify the intermolecular forces that these compounds have in common.
Answer Choices: A. Dispersion forces only B. Dipole-dipole forces only C. Dispersion forces, dipole-dipole forces, and hydrogen bonding D. Dispersion forces and dipole-dipole forces
Answer: D. Dispersion forces and dipole-dipole forces
Question: When the temperature of a liquid increases what happens to the viscosity and surface tension of the liquid?
Answer Choices: A. Viscosity increases, surface tension increases B. Viscosity increases, surface tension decreases C. Viscosity decreases, surface tension decreases D. Viscosity decreases, surface tension increases
Answer: C. Viscosity decreases, surface tension decreases
Question: Which of the following molecules can form hydrogen bonds with water?
Answer Choices: A. CH₄ B. CCl₄ C. NH₃ D. CO₂
Answer: C. NH₃
Question: Which of the following substances has the highest melting point?
Answer Choices: A. NaCl B. Cl₂ C. NO₂ D. CH₄ E. H₂S
Answer: A. NaCl