Classify each of the following solids as: Metallic, Network Covalent, Ionic, or Molecular?

Question

Classify each of the following solids as Metallic, Network Covalent, Ionic or Molecular substances.

A.) It is insoluble in water, melts above 500C, and does not conduct electricity as a solid

B.) It dissolves in water, but does not conduct electricity as an aqueous solution or as a solid

C.) It dissolves in water, melts above 100C, and conducts electricity when present in an aqueous solution

Answer 1

A.)Network Covalent – sand SiO2
B.)Molecular substances - sugar
C.)Ionic – salt NaCl

Answer 2

1. metallic - Metals usually exist in solid form and are brightly colored especially the transition elements. They are also very good conductors. 2. Covalent network - Covalent network solids have very high melting points because of their strong structure. Should they melt, they still don't have the ability to conduct electricity, 3. ionic - ionic solids also have high melting point due to the strong interactions between its atoms. Components ions have achieved stable configuration so its difficult to melt them. Nonetheless, once it melts, it will give a solution of postitive and negative ions that have the ability to conduct electricity. 4. covalent - lower melting point and distinct colors are characteristics of a covelent solid, notably, coordinate covelent solids aka complex compounds.

Answer 3

A is network covalent

B is molecular

C is ionic