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PracticeExam1 - 1(4 pts For a given substance which is...

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1 1. (4 pts) For a given substance which is generally larger, the heat of vaporization or the heat of fusion? Circle the answer. a) Heat of vaporization b) Heat of fusion 2. (4 pts) Which one of the following has the longest CO bond length? Circle the correct answer. CO H 2 CO CO 3 2– CH 3 OCH 3 CO 2 3. (20 pts) Circle the formula that best fits each of the following descriptions: a) number of σ -bonds in N 2 F 2 1 2 3 4 5 b) hybridization on the central chlorine atom in ClO 2 sp sp 2 sp 3 dsp 3 d 2 sp 3 c) most polar bond C H N H O H d) greatest bond energy (as predicted by MO theory) O 2 O 2 + O 2 O 2 2– e) greatest electronegativity K Si S Ar f) contains one π -bond CN SO 2 NO + CO 2 g) greatest viscosity CH 3 CH 2 CH 2 CH 3 CH 3 CH 2 CH 2 OH HOCH 2 CH 2 OH h) higher vapor pressure at 1 atm, 25 o C CH 3 OCH 3 CH 3 CH 2 OH H 2 O i) lowest freezing point H 2 O O 2 He CO 2 j) highest boiling point BCl 3 HCN NH 4 Cl SiH 4
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2 4. (8 pts) Indicate the hybridization on the carbon atoms.
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