SCH4U Molecular Architecture Worksheet #6

Molecular Architecture Crystals Worksheet
1.	The metal Osmium, Os, forms an oxide with the OsO₄. The soft crystals of OsO₄ melt at 40^oC 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 3000^oC 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 113^oC 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, 78.4^oC
	Ethylene glycol, C₂H₄(OH)₂ , 197.2^oC
	Water, H₂O, 100.0^oC
	Diethyl ether, C₄H₁₀O, 34.5^oC
5.	Butane, C₄H₁₀, has a boiling point of -0.5^oC. 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 -30.2^oC. 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 2468^oC and conducts electricity. What kind of solid does columbium form?