Chemistry Test Chemical Bonding 5

Question 1

Which type of solid is characterized by a lattice of positive ions surrounded by a sea of delocalized electrons?

Accepted Answer

Metallic solid

Answer

Metallic solids consist of metal cations embedded in a delocalized electron cloud, accounting for conductivity and malleability.

Question 2

What is the primary reason HF has a higher boiling point than HCl despite having lower molar mass?

Accepted Answer

HF molecules form hydrogen bonds with each other

Answer

HF molecules form strong hydrogen bonds due to the highly electronegative fluorine atom bonded to hydrogen.

Question 3

In resonance structures, what is true about the actual structure of the molecule?

Accepted Answer

It is a hybrid that blends all resonance contributors

Answer

The true structure is a resonance hybrid — a weighted average of all resonance contributors, with bonds intermediate in character.

Question 4

Which factor most influences whether a bond is ionic or covalent?

Accepted Answer

The electronegativity difference between the bonded atoms

Answer

A large electronegativity difference (>1.7) between atoms favors ionic character, while a small difference favors covalent bonding.

Question 5

What is the hybridization of carbon in carbon dioxide (CO₂)?

Accepted Answer

sp

Answer

Carbon in CO₂ is sp hybridized, forming two sigma bonds with two unhybridized p orbitals available for two pi bonds.

Chemistry Practice Test