Properties of Covalent structures

Are covalent bonds strong or weak?

• strong

• weak

What structure is shown in the diagram?

• Diamond
• Graphite
• Carbon fiber
• Carbon nanotubes

Tags

NGSS.HS-PS1-3

True of false? Simple molecular substances have low melting and boiling points.

• true

• false

Which two of the following are examples of simple molecules?

• graphite

• silicon dioxide

• water

• carbon dioxide

Why do simple molecular substances have low melting and boiling points?

• The intermolecular forces between simple molecules are weak.

• The covalent bonds holding the atoms together in a simple molecule are strong.

• A large number of covalent bonds hold the atoms together in simple molecules.

What happens when a simple molecular substance melts or boils?

• The weak intermolecular forces between the molecules break.

• Strong covalent bonds between the atoms of the molecule break.

Why do weak intermolecular forces between simple molecules result in low melting and boiling points?

• Little energy is needed to break the strong covalent bonds.

• Little energy is needed to break the weak intermolecular forces.

• Lots of energy is needed to break the weak intermolecular forces.

Which of the following simple molecular substances conduct electricity?

• water

• oxygen

• carbon dioxide

• all of these simple molecular substances

• none of these simple molecular substances

Which two of the following are examples of giant covalent structures?

• graphite

• silicon dioxide

• water

• carbon dioxide

True of false? Giant covalent structures have low melting and boiling points.

• true

• false