Chapter 9, Problem 50QRT

(a)

Interpretation Introduction

Interpretation:

The type of solid exhibits the properties like melts below ${100}^{\circ }C$ and is insoluble in water has to be identified.

Concept introduction:

Types of solids and their properties:

	Ionic solid	Metallic Solid	Molecular Solid	Network Solid	Amorphous Solid
Formed from	Reactive metals and reactive non metals	Elements that are metals	Non-metals combined with non-metals	Group IVA elements; many compounds containing silicon and oxygen	A broad range of elements and compounds
Structural units	Ions(positive and negative ions)	Metal atoms(Kernels in sea of electron)	Molecules	Atoms	Covalently bonded networks of atoms or collections of large molecules with short-range order
Forces holding units together	Ionic bonding	Metallic bonding	London forces, dipole-dipole interactions, hydrogen bonds	Covalent bonds	Covalent bonds
Typical properties	Hard and brittle, high melting point, poor conductor in solid state but good conductor in molten state, poor thermal conductor	Malleable and ductile, good electrical and thermal conductor, wide range of hardness and melting point	Low to moderately high melting point and boiling point, soft, poor thermal and electrical conductor	Wide range of hardness and melting point, poor thermal and electrical conductor	Non crystalline, high melting point, poor electrical conductor
Examples	$NaCl,K_{2}S{O}_4,CaC{l}_2$	Iron, silver, copper, nickel	$H_2,I_2,O_2,H_{2}O,C{O}_2$	Graphite, diamond, quartz, mica	Glass, nylon, polyethylene

(b)

Interpretation Introduction

Interpretation:

The type of solid exhibits the property like conducts electricity only when melted has to be identified.

Concept introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The type of solid exhibits the properties like insoluble in water and conducts electricity has to be identified.

Concept introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

The type of solid exhibits the properties like non-crystalline and melts over a wide temperature range has to be identified.

Concept introduction:

Refer to part (a).