CHEM 210 FINAL PAPER FULL QUESTIONS AND CORRECT ANSWERS PREMIUM STUDY SHEET.pdf

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