Chemical Bond

What is the primary difference between a covalent network solid and a molecular solid?

• Covalent network solids are formed by ionic bonds, while molecular solids are formed by covalent bonds.

• Covalent network solids have individual molecules attracted by intermolecular forces, while molecular solids have a continuous network of covalent bonds.

• Covalent network solids consist of a continuous network of atoms held by covalent bonds, while molecular solids consist of discrete molecules held together by intermolecular forces.

• Covalent network solids are good conductors of electricity, while molecular solids are insulators.

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Which of the following properties is characteristic of covalent network solids?

• Low melting points due to weak intermolecular forces.

• Good electrical conductivity due to delocalized electrons.

• High hardness and high melting points.

• Composed of positive and negative ions.

Which substance is an example of a covalent network solid?

• Sodium chloride

• Water ice

• Diamond

• Copper

Graphite, a covalent network solid, is known for its ability to be easily scraped, as seen when writing with a pencil. What explains this property?

• The strong covalent bonds between its layers.

• The presence of a sea of delocalized electrons.

• Weak intermolecular forces between its covalent network sheets, allowing them to slide past each other.

• Its low melting point.