exam3-2 - I Multiple choice 1 Ethanol,CH3CH2OH,,CH3OCH3...

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I Multiple choice 1. Ethanol ,CH 3 CH 2 OH, has a much higher boiling point than dimethyl ether, CH 3 OCH 3 ,  78.5 ° C and  23.6 ° C respectively.  What might be the reason for this? a.   The molar mass of ethanol is higher.      B.   Ethanol is a polar molecule while dimethyl ether is a nonpolar molecule. c.   Ethanol is an ionic compound (CH 3 CH 2 O  and H + ) whereas dimethyl ether is a        molecular compound. d.   Ethanol molecules form hydrogen bonds, while dimethyl ether molecules cannot form    hydrogen bonds among themselves. 2. For which of the compound below, the molecules cannot form hydrogen bonds among  themselves but may form hydrogen bonds with water molecules?  I. (CH 3 ) 3 N (trimethylamine) II. (CH 3 ) 2 NH (dimethylamine) III. CH 3 NH 2  (methylamine) IV. CH 3 OCH 3  (dimethyl ether) a.  IV   b.   I and IV   c.  I   d.  I and II 3. If an isolated system contained +5 kJ of energy, after 100 years  Δ U  = a.  impossible to determine   b.  Slightly less than +5 kJ    c.  +5kJ d.  0 kJ      e.   -5 kJ
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