12. Liquids, Solids, and Intermolecular Forces

What is the major electrostatic force found within an ammonia molecule, NH₃? 

As it cools off, olive oil slowly hardens and forms a solid over a range of temperatures. Which best describes it as a solid?

Compound A is hard, doesn't conduct electricity, and melts at 1400ºC. Compound A represents which of the following:

Classify each solid as amorphous, molecular, network covalent, alloy or ionic.

a) Steel                                                    ______________________
b) CO₂                                                     ______________________
c) Graphite                                              ______________________
d) CaCO₃                                                 ______________________
e) Bronze, an alloy of Cu and Sn           ______________________