CHEM 210 FINAL PAPER FULL QUESTIONS
AND CORRECT ANSWERS PREMIUM STUDY
SHEET
●● Rank IMFs from weakest to strongest.
Answer: London Dispersion < Dipole-Dipole < Hydrogen Bonding <
Ion-Dipole
●● What causes London Dispersion Forces?
Answer: Temporary electron movement creates instantaneous dipoles
(present in all molecules)
●● What factors increase London Dispersion Force strength?
Answer: More electrons (bigger atoms) and greater surface area
(long/flat molecules)
●● What are Dipole-Dipole forces?
Answer: Attraction between permanent partial charges in polar
molecules
●● What are the requirements for Hydrogen bonding?
Answer: Hydrogen must be bonded to Nitrogen, Oxygen, or Fluorine
, ●● Why is hydrogen bonding strong?
Answer: Large electronegativity difference creates strong partial charges
●● What are Ion-dipole forces?
Answer: Attraction between ions and polar molecules (important in
dissolving salts)
●● How do IMFs affect boiling point?
Answer: Stronger IMF leads to a higher boiling point
●● How do IMFs affect vapor pressure?
Answer: Stronger IMF leads to lower vapor pressure
●● What are volatile liquids?
Answer: Liquids that evaporate easily due to weak IMFs
●● What is viscosity?
Answer: A liquid's resistance to flow
●● What factors increase viscosity?
Answer: Strong IMFs and long molecules
AND CORRECT ANSWERS PREMIUM STUDY
SHEET
●● Rank IMFs from weakest to strongest.
Answer: London Dispersion < Dipole-Dipole < Hydrogen Bonding <
Ion-Dipole
●● What causes London Dispersion Forces?
Answer: Temporary electron movement creates instantaneous dipoles
(present in all molecules)
●● What factors increase London Dispersion Force strength?
Answer: More electrons (bigger atoms) and greater surface area
(long/flat molecules)
●● What are Dipole-Dipole forces?
Answer: Attraction between permanent partial charges in polar
molecules
●● What are the requirements for Hydrogen bonding?
Answer: Hydrogen must be bonded to Nitrogen, Oxygen, or Fluorine
, ●● Why is hydrogen bonding strong?
Answer: Large electronegativity difference creates strong partial charges
●● What are Ion-dipole forces?
Answer: Attraction between ions and polar molecules (important in
dissolving salts)
●● How do IMFs affect boiling point?
Answer: Stronger IMF leads to a higher boiling point
●● How do IMFs affect vapor pressure?
Answer: Stronger IMF leads to lower vapor pressure
●● What are volatile liquids?
Answer: Liquids that evaporate easily due to weak IMFs
●● What is viscosity?
Answer: A liquid's resistance to flow
●● What factors increase viscosity?
Answer: Strong IMFs and long molecules
