AP Chemistry: Chemical Bonding & Molecular Structure 2

Question 1

According to VSEPR theory, what is the molecular geometry of a molecule with two bonding pairs and two lone pairs on the central atom (AX2E2)?

Accepted Answer

Bent

Answer

Linear

Answer

Trigonal planar

Answer

Tetrahedral

Question 2

Which molecule contains a coordinate (dative) covalent bond?

Accepted Answer

NH4+

Answer

CH4

Answer

O2

Answer

CO2

Question 3

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

Accepted Answer

sp

Answer

sp2

Answer

sp3

Answer

sp3d

Question 4

Which of the following best explains why a water molecule is polar?

Accepted Answer

Its bent shape gives an uneven distribution of charge

Answer

It has nonpolar O-H bonds

Answer

Oxygen is less electronegative than hydrogen

Answer

It has a linear geometry that cancels dipoles

Question 5

How many sigma and pi bonds are present in a molecule of nitrogen gas (N2)?

Accepted Answer

1 sigma, 2 pi

Answer

2 sigma, 1 pi

Answer

3 sigma, 0 pi

Answer

0 sigma, 3 pi

Question 6

Which intermolecular force is primarily responsible for the unusually high boiling point of HF compared to other hydrogen halides?

Accepted Answer

Hydrogen bonding

Answer

London dispersion forces

Answer

Dipole-dipole only

Answer

Ion-dipole forces

Question 7

What is the formal charge on the central oxygen atom in the ozone molecule (O3) Lewis structure with one single and one double bond?

Accepted Answer

+1

Answer

-1

Answer

0

Answer

+2