1. Calculate if the following molecules are polar or non-polar.
POCl, HBr, SnCl4 , CH2O, PBr3 , BCl3
2. Discuss which is expected to have the higher boiling point :
C8H18 or C4H10? WHY?
3. Determine what kinds of intermolecular attractive forces (dipole - dipole, London, hydrogen bonding ) are present in the following substances:
PCl3, HF, CS2 , CCl4
4. Explain what kind of forces exists between the particles in:
a. molecular solids
b. ionic solids
c. covalent network solids
5. Elemental Boron is very hard, does not conduct electricity well, and has a melting point of about 2250o C. What kind of solid is Boron?
6. Discuss how does the valence bond theory explain electron sharing between atoms in a covalent bond?