2. F2 boils at a temperature very close to the boiling point of one of the following substances. Which substance below has a boiling point similar to that of Fz A. HF B. Cl2 C. Ne D. HCI E. Ar NaF 3. Circle the roman numeral for any compound that exhibits only London dispersion forces and no other type of intermolecular forces I. II. CaF2 III. CrF3 IV. CF4 V. HF 4. Which of the following statements is true A. Because more intermolecular forces are broken when water vaporizes than when ice melts, AHvaporization (in kJ/mol) should be greater than AH fusion (in kJ/mol) B. As the size of a covalent molecule increases, the strength of the London dispersion forces decreases C. Molecules which exhibit hydrogen bonding intermolecular forces have unusually low melting points D. A polar covalent compound will generally have a lower vapor pressure at some temperature than an ionic compound E. In general, the strength of the intermolecular forces exhibited in the gaseous state are much stronger than the intermolecular forces exhibited in the liquid or solid state 5. In each of the following pairs, circle the compound with the higher boiling point. I. CO2 vs. COS II. CH, Vs. SiH III. KCl vs. HI