Question #14. Relative Boiling Points. For each of the pair of substances in the table below, identify the most important type of "intermolecular" force for each substance in the pair, and then tell which substance in the pair would have the higher boiling point. Most Important Forces for Most Important Forces for Substance with Pair of Substances First Substance Second Substance Higher Boiling Point O2 and N2 [ Select ] V [ Select ] [ Select ] London dispersion forces Hydrogen bonding Dipole-dipole forces lon-dipole forces SİH4 and GeH4 [ Select ] [ Select ] lon-ion forces HF and HI [ Select ] [ Select ]

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Consider the following experimental boiling points: CH4: -162°C C3Hg: -42°C C6H14: 69°C C9H20: 151°C Which of the following statements is correct for this set of compounds and supported by the data given? Select as many as applicable Select one or more: The molecule with the strongest intermolecular forces is C9H20 The C-C bond is the strongest covalent bond among the four molecules The dominant effect behind this trend is the strength of dipole/dipole forces OCH4 is the most polarizable molecule of the four C9H₂0 is the most polarizable molecule of the four The dominant effect behind this trend is the strength of dispersion forces

Question #15. Hydrogen Bonding. For each of the substances below, tell whether the molecules of that substance would be expected to form hydrogen bonds to each other. H H a) [ Select ] H- H v [ Select ] Yes, there is hydrogen bonding between the molecules of this substance. No, there is no hydrogen bonding in this substance. b) CH4 с) HF [ Select ] H :Q: d) H-C-C-Ö-H [ Select ] H e) Br2 [ Select ] H f) H-C-0-H [ Select ] H