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Worksheet 1018 Name 6 Feb 2023 1. Which of the following pairs has the highest melting point? Use Coulomb's law to justify your answer. A. NaF or Nal B. KCl or CaCl C. NaCl or CaO 2. Place the following in order of increasing melting point fyou should be able to justify your answer): Nal2,NaCl,Na2CO3 and Ab2O3 3. Explain why noble gasses do not easily fom bonds. 4. Ion-dipole forces are weaker than ion-ion forces, yet the politr comipound water is capable of dissolving many ionic compounds. Explain this apparent contradiction. 5. Identify the strongest intermolecular force present in pure samples of the following substances. A. SO2 B. H2O D. CHCl E. HF C. KI F. H2CO Aerkatwe 1088 6. Methylene chloride, CHaCt, is a polar compoand. Why is this the case? You should use a Lewis Dot structure to help justify yoar answir 7. Arrage the following compounds in order of increasing meling point. Dimcthyl ether (CH,OCH,3). cthanol CH3CH3OH, and peopues (CH3CH3CH3). Why bave yeu placed them in this order. 8. Water is a polar compound, yet we diseussed reasons why water has an ususually strong dipole. Briefly disetass these three reasons as they relate to water. 9. Explin how dipole-dipole forces cause molecules to be attracted to one another. 10. What conditions mast be met to qualify ar compound as hydrogen bonding? 11. Which of the following has hydrogen bonding? A. HE B. NH3 C. CH4 D. [NO] E. CHHOH F. H2CO 12. Using only intermolecular forces place the following in order of their increasing melting point and briefly explain: N2,CH3C and NH3