26. Explain the easy conductivity of electricity by most metals. Why do metals conduct heat well? What gives them their typical "metallic" luster or sheen? Explain the metallic black sheen in graphite. Why does diamond not have the same appearance?

27. Why does liquid ammonia (boiling point -33°C) have solvent properties similar to those of water? Sketch what happens when sodium chloride is dissolved in liquid ammonia. Do the same for methyl alcohol in liquid ammonia.

28. If we were to search through the solar system for life that evolved in liquid ammonia like it evolved in liquid water on Earth, should we begin searching on planets nearer to, or farther from, the sun?

29. What nearly unique physical property does water have that liquid ammonia does not have? How would this affect the temperature distribution at different depths in oceans of liquid ammonia versus oceans of water?