Identify all substances that can be classified as a network solid.

SiCl4

Zr

Fe2(SO4)3

SiH4

Co(NO3)2

Y

None

To identify substances that can be classified as a network solid, we need to understand the characteristics of a network solid. A network solid is a type of solid in which the atoms are bonded together in a continuous three-dimensional network structure. The bonding in a network solid involves covalent bonds extending throughout the entire structure, resulting in a strong and rigid solid.

Let's examine each substance and determine if it can be classified as a network solid:

1. SiCl4: Silicon tetrachloride is not a network solid. It consists of discrete molecules held together by weak intermolecular forces, rather than a continuous network structure.

2. Zr: Zirconium, in its pure elemental form, is not a network solid. It is a metal and has a closely packed metallic structure, not a covalent network.

3. Fe2(SO4)3: Iron(III) sulfate is not a network solid. It is an ionic compound, consisting of iron cations (Fe3+) and sulfate anions (SO42-) held together by ionic bonds.

4. SiH4: Silicon tetrahydride, also known as silane, is not a network solid. Similar to SiCl4, it consists of discrete molecules held together by weak intermolecular forces.

5. Co(NO3)2: Cobalt(II) nitrate is not a network solid. It is an ionic compound containing cobalt cations (Co2+) and nitrate anions (NO3-) held together by ionic bonds.

6. Y: In its pure elemental form, yttrium is not a network solid. It is a metal and has a closely packed metallic structure, not a covalent network.

Based on the analysis, none of the given substances can be classified as a network solid.