Intermolecular Forces Exam Questions PDF

1. Which type of intermolecular force exists between *all* molecules? * (A) Hydrogen bonding * (B) Permanent dipole-permanent dipole forces * (C) Van der Waals' forces * (D) Ionic bonding 2. Van der Waals' forces are also known as: * (A) Dipole-dipole forces * (B) London dispersion forces * (C) Hyd...

1. Which type of intermolecular force exists between *all* molecules? * (A) Hydrogen bonding * (B) Permanent dipole-permanent dipole forces * (C) Van der Waals' forces * (D) Ionic bonding 2. Van der Waals' forces are also known as: * (A) Dipole-dipole forces * (B) London dispersion forces * (C) Hydrogen bonds * (D) Covalent bonds 3. What causes Van der Waals' forces? * (A) Permanent dipoles in molecules * (B) Temporary/induced dipoles due to uctuations in electron distribution * (C) Sharing of electrons between molecules * (D) Transfer of electrons between molecules 4. As the number of electrons in a molecule increases, the strength of the Van der Waals' forces generally: * (A) Increases * (B) Decreases * (C) Remains the same * (D) Becomes zero 5. As the Mr of a non-polar molecule increase, the strength of the van der Waals forces generally: * (A) Increases * (B) Decreases * (C) Remains the same * (D) Becomes zero 6. Which type of intermolecular force occurs between molecules with a permanent dipole? * (A) Van der Waals' forces * (B) Permanent dipole-permanent dipole forces * (C) Hydrogen bonding * (D) Ionic bonding fl 7. What is a permanent dipole? * (A) A temporary separation of charge due to electron movement * (B) A separation of charge due to differences in electronegativity * (C) A complete transfer of electrons * (D) No separation of charge 8. Which of the following molecules will have permanent dipole- permanent dipole forces? * (A) CO₂ * (B) CCl₄ * (C) HBr * (D) CH₄ 9. Which type of intermolecular force is the strongest? * (A) Van der Waals' forces * (B) Permanent dipole-permanent dipole forces * (C) Hydrogen bonding * (D) Dative covalent bonding 10. Hydrogen bonding occurs when hydrogen is directly bonded to which elements? * (A) Carbon, oxygen, and sulfur * (B) Nitrogen, oxygen, and uorine * (C) Chlorine, bromine, and iodine * (D) Any electronegative element 11. Why is hydrogen bonding unusually strong? * (A) Hydrogen is very large. * (B) Hydrogen has a very high electronegativity. * (C) Hydrogen has no inner electron shells, and N, O, and F are small and highly electronegative. * (D) Hydrogen can form multiple covalent bonds. 12. Which of the following molecules can form hydrogen bonds with itself? * (A) CH₄ * (B) H₂O * (C) CO₂ * (D) CCl₄ fl 13. Which of the following molecules can form hydrogen bonds with water? * (A) CH₄ * (B) NH₃ * (C) CCl₄ * (D) Br₂ 14. Substances with stronger intermolecular forces tend to have: * (A) Lower boiling points * (B) Higher boiling points * (C) Lower melting points * (D) No change in boiling/melting points 15. Why does water have a relatively high boiling point compared to other similar-sized molecules? * (A) It has strong Van der Waals' forces * (B) It has strong hydrogen bonding * (C) It has permanent dipole-permanent dipole forces * (D) It is a small molecule 16. Ice is less dense than liquid water. This is due to: * (A) The molecules in ice are smaller. * (B) Ice has weaker van der waals forces. * (C) The hydrogen bonds in ice hold the molecules in a more open, ordered structure. * (D) Ice has stronger van der waals forces. 17. True or False: Intermolecular forces are stronger than covalent bonds. * (A) True * (B) False 18. True or False. Intermolecular forces are stronger than ionic bonds. * (A) True * (B) False 19. Which of these compounds has the lowest boiling point? * (A) HF * (B) HCl * (C) HBr * (D) HI 20. Which of these compounds has the highest boiling point? * (A) CH₄ * (B) H₂O * (C) CO₂ * (D) H₂