Crystalline Solids

Which type of molecular solids is supposed to be harder and why?

State the properties of polar molecular solids.

Define polar molecular solids.

Molecules are held together by weak intermolecular forces in molecular solids.

Which of the following is a molecular solid? Diamond, Graphite, Ice, Quartz.

The number of carbon atoms per unit cell of diamond is

Which of the following solids is not an electrical conductor?
(A) $\mathrm{Mg} \left(\mathrm{S}\right)$
(B) $\mathrm{TiO} \left(\mathrm{s}\right)$
(C) ${\mathrm{I}}_2 \left(\mathrm{s}\right)$
(D) ${\mathrm{H}}_2\mathrm{O} \left(\mathrm{s}\right)$

Explain: Ionic solids are hard and brittle.

Explain: The basis of similarities and differences between metallic and ionic crystals.

The major binding force in graphite is

The major binding force in silicon is

The major binding force of diamond is

Diamond is a

Graphite is a

"Stability of a crystal is reflected in the magnitude of its melting points". Comment.

Melting points of solid water, ethyl alcohol, diethyl ether and methane are $273 \mathrm{K}, 155.7 \mathrm{K}$, $156.7 \mathrm{K}$ and $90.5 \mathrm{K}$.

What can you say about the intermolecular forces between these molecules? 

Classify the following solids as ionic, metallic, molecular, network or amorphous. 

$\mathrm{Si}$

Classify the following solid as ionic, metallic, molecular, network, or amorphous.

$\mathrm{LiBr}$ 

Classify the following solid as ionic, metallic, molecular, network or amorphous.

$\mathrm{Rb}$

Classify the following solids as ionic, metallic, molecular, network or amorphous. 

${\mathrm{P}}_4$

Classify the following solids as ionic, metallic, molecular, network or amorphous. 

${\mathrm{I}}_2$