Topical Questions
These questions are keyed to the major topics in the chapter. Usually a question that is answered at the back of this book is paired with a similar one that is not.
On the basis of the description given, classify each of these solids as molecular, metallic, ionic, network, or amorphous, and explain your reasoning.
(a) A soft, slippery solid that has no definite melting point but decomposes at temperatures above 250 °C; the solid does not conduct electricity.
(b) Violet crystals that melt at 114 °C and whose vapor irritates the nose; neither the solid nor the liquid conducts electricity.
(c) Hard, colorless crystals that melt at 2800 °C; the liquid conducts electricity, but the solid does not.
(d) A hard solid that melts at 3410 °C; both the solid and the liquid conduct electricity.
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