2. What kind of bonding (ionic or covalent) would you predict
for the products resulting from the following combinations of
elements?
(a) Na + I2
(b) C + S
(c) Mg + Br2
(d) P4 + Cl2
6. While sulfur forms the compounds SF4 and SF6, no
equivalent compounds of oxygen, OF4 and OF6, are known.
Explain.
7. Which of these molecules have an odd number of valence
electrons: NO2, SCl2, NH3, NO3?
8. Write resonance structures for NO. Predict a value for the
N-O bond length based on bond lengths given in Table 8.1, and
explain your answer.
9. Consider these structures for the formate ion, HCO2Designate which two are resonance structures and which is
equivalent to one of the resonance structures.
14. Write Lewis structures for these molecules or ions.
(a) ClF
(b) H2Se
(c) BF4(d) PO43-
15. Write Lewis structures for these molecules.
(a) CHClF2, one of several chlorofluorocarbons that have been
used in refrigeration
(b) Methyl alcohol, CH3OH
(c) Methyl amine, CH3NH2
23. Write the structural formulas for all the branched-chain
compounds with the molecular formula C4H10
24. Write the structural formulas for all the branched-chain
compounds with the molecular formula C6H14
27. From their molecular formulas, classify each of these
straight-chain hydrocarbons as an alkane, an alkene, or an
aIkyne.
(a) C21H44
(b) C4H6
(c) C8H16
32. Oxalic acid has this structural formula:
O
OH
HO
O
oxalic acid
Is cis-trans isomerism possible for oxalic acid? Explain your
answer.
33. 2-methyl propene has this Lewis structure:
Is cis-trans isomerism possible?
2-methyl propene
34. For each pair of bonds, predict which will be the shorter.
(a) B-CI or Ga-Cl
(b) C-O or Sn-O
(c) P-S or P-O
O
(d) The C=C or the C=O bond in acrolein:
acrolein