7. For each of the following compounds, predict which will have the higher melting point and indicate why. a) C6Cl6,C6H6 b) HF,HCl c) NH3,BH3 d) Ar, Xe OH), or KCl ? Why? 9. Explain why temperature remains constant during a phase change even though energy is being added. 10. Explain why the heat of fusion for any substance is generally lower than its heat of vaporization. 11. Explain why, at room temperature, LiF is a solid and N2 is a gas. 12 Explain why water has a higher boiling point than H2S. 13 Indicate the type(s) of intermolecular force(s) exhibited by the following. molecules: a. CCl4 c. KF e. OF2 b. Xe d. NH3 f. SO2 14. Given that CH3OH has a higher boiling point than CH3F, what can you say about their relative intermolecular forces? Extra Credit: (a) What is the source of energy during a thunderstorm? (b) If you were to compare the intermolecular forces in 2 different liquids, what types of data would you collect