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Chemistry Unit II Bonding Review
  • 1. Which statement describes what occurs as two atoms of bromine combine to become a molecule of bromine?
A) Energy is released as a bond is formed
B) Energy is absorbed as a bond is formed.
C) Energy is released as a bond is broken.
D) Energy is absorbed as a bond is broken.
q u rev
  • 2. What is happening in Equation A?
A) A bond is formed and energy is released.
B) A bond is formed and energy is absorbed.
C) A bond is broken and energy is released.
D) A bond is broken and energy is absorbed.
q rev molecular attractions
  • 3. According to the table, which of these has the strongest forces of attraction?
A) sulfur dioxide
B) helium
C) water
D) hydrogen gas
  • 4. The intermolecular force known as hydrogen bonding can occur with the following elements except
A) fluorine
B) oxygen
C) carbon
D) hydrogen
E) nitrogen
  • 5. Which of the following has the highest boiling point?
A) H2Te
B) H2O
C) H2Se
D) H2S
  • 6. Given the compound SO2, what intermolecular forces of attraction exist?
A) Dispersion and dipole-dipole
B) dipole-dipole and hydrogen bonding
C) Dispersion and hydrogen bonding
D) Dispersion, dipole-dipole, and hydrogen bonding
  • 7. Which formula represents a nonpolar molecule?
A) NH3
B) CH4
C) H2S
D) HCl
  • 8. Which of the following statements explains why the bond in HCl is polar covalent?
A) The atomic mass of chlorine is greater than that of hydrogen
B) The number of valence electrons in a chlorine atom is greater than that in a hydrogen atom.
C) the electronegativity of chlorine is greater than that of hydrogen
D) The diameter of a chlorine atom is greater than that of a hydrogen atom.
  • 9. Water has serveral unique properties such as high boiling point, high surface tension, and ability to hold proteins together. The type of attraction that best explains these properties is
A) covalent bonding
B) hydrogen bonding
C) ionic bonding
D) dispersion forces
  • 10. Which order of elements demonstrates a gradual decrease in the strength of the intermolecular attractions?
A) Ar, Kr, Ne, Xe
B) Xe, Kr, Ar, Ne
C) Kr, Xe, Ar, Ne
D) Ne, Ar, Kr, Xe
  • 11. The change of energy that best describes freezing is
A) exothermic because heat energy is released by H2O
B) endothermic because temperature of H2O decreases
C) exothermic because temperature of H2O increases
D) endothermic because H2O absorbs heat energy
  • 12. Identify the strongest bond
A) triple bond
B) double bond
C) single bond
  • 13. Which of the following is most likely to be a gas at room temperature?
A) NH3
B) HF
C) N2
D) H2O
molecules of similar bp
  • 14. Which substance has the greatest amount of intermolecular forces of attraction?
A) CH3OH
B) NO
C) F2
D) C2H4
  • 15. Methanol, CH3OH has a boiling point of 65C whereas methane has a boiling point of -164C. What intermolecular forces are responsible for the higher boiling point of methanol?
A) hydrogen bonds
B) ionic bonds
C) dispersion forces
D) dipole-dipole attractions
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