1. In which case is the bond polarity incorrect?
a. δ+H–Fδ–
b. δ+Si–Sδ–
c. δ+Cl–Iδ–
d. δ+K–Oδ–
e. δ+Mg–Hδ–
2. Calculate the value of ΔH° for the reaction C2H6 + 2 Cl2 → C2H4Cl2 + 2 HCl given the bond energies (kJ/mol):
H-H 432 kJ/mol
C-H 314 kJ/mol
H-Cl 427 kJ/mol
C-C 347 kJ/mol
Cl-Cl 243 kJ/mol
C-Cl 339 kJ/mol
3. What intermolecular forces are responsible for base pairing in DNA?
a. Hydrogen bonding
b. London
c. Hydrophobic
d. Dipole-dipole
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