Molecular Architecture Crystals Worksheet
1.  The metal Osmium, Os, forms an oxide with the OsO4. The soft crystals of OsO4 melt at 40oC and the resulting liquid does not conduct electricity. In what form does OsO4 probably exist in the solid.

2. Boron nitride, which has the empirical BN, melts under pressure at 3000oC and is as hard as a diamond. What is the probable solid type for this compound?

3. Crystals of elemental sulphur are easily crushed and melt at 113oC to give a clear yellow liquid that doesn't conduct electricity. What is the probable crystal type for solid sulphur?

4. The boiling points of some common substances are given here. Arrange these substances in order of increasing strengths of intermolecular attractions.

Ethanol, C2H5OH,  78.4o

Ethylene glycol, C2H4(OH)2 , 197.2oC

Water, H2O, 100.0o

Diethyl ether, C4H10O, 34.5oC

5. Butane, C4H10, has a boiling point of -0.5oC. Despite this, liquid butane can be seen sloshing around inside a typical butane lighter, even at room temperature. Why isn't the butane boiling inside the lighter at room temperature?

6. Tin(IV) chloride, SnCl4, has soft crystal with a melting point of -30.2oC. The liquid is nonconducting. What type of crystal is formed by SnCl4?

7.  Columbium is another name for one of the elements. This element is shiny, soft, and ductile. It melts at 2468oC and conducts electricity. What kind of solid does columbium form?