Question 1

Which of the following molecules has a trigonal planar molecular geometry according to VSEPR theory?

Accepted Answer

BF$$_3$$

Question 2

What is the bond angle in a molecule with tetrahedral geometry?

Accepted Answer

$$109.5^\circ$$

Question 3

Which of the following best describes the bond in HCl based on electronegativity difference?

Accepted Answer

Polar covalent

Question 4

Given the Lewis structure for NO$$_3^-$$, how many resonance structures can be drawn for this ion?

Accepted Answer

3

Question 5

Which of the following molecules is expected to be nonpolar based on its geometry and bond polarities?

Accepted Answer

SiCl$$_4$$

Question 6

Calculate the formal charge on the central atom in the Lewis structure of SO$$_4$$^{2-}$$ where all oxygens are singly bonded to sulfur.

Accepted Answer

+2

Question 7

Which molecule violates the octet rule by having an expanded octet?

Accepted Answer

SF$$_6$$

Question 8

Which of the following bonds is the strongest based on average bond energies?

Accepted Answer

N≡N

Question 9

A molecule has four electron groups: two bonding pairs and two lone pairs. What is its molecular geometry?

Accepted Answer

Bent

Question 10

Which of the following best explains why HF molecules align in an electric field?

Accepted Answer

HF is polar and has a permanent dipole moment

Question 11

Which of the following molecules has a linear molecular geometry but a trigonal bipyramidal electron geometry?

Accepted Answer

XeF$$_2$$

Question 12

What is the bond order of O$$_2 in $$its Lewis structure?

Accepted Answer

2

Question 13

Which of the following statements about bond length and bond strength is correct?

Accepted Answer

Shorter bonds are generally stronger than longer bonds

Question 14

Which of the following molecules is expected to have the largest bond angle?

Accepted Answer

BeCl$$_2$$

Question 15

Which of the following best describes the electron distribution in a polar covalent bond?

Accepted Answer

Electrons are shared unequally between the two atoms

Question 16

Which of the following is the correct Lewis structure for nitrogen trifluoride (NF$$_3$$)?

Accepted Answer

a) (see image with N central, three F atoms, and one lone pair on N)

Question 17

Which of the following molecules is expected to have a net dipole moment?

Accepted Answer

CH$$_2F$_2$$

Question 18

Which of the following is a correct application of formal charge rules when choosing the best Lewis structure?

Accepted Answer

The negative formal charge should reside on the most electronegative atom

Question 19

Which of the following molecules is an example of a molecule with an incomplete octet?

Accepted Answer

BF$$_3$$

Question 20

Which of the following best describes the geometry and bond angles of SF$$_6$$?

Accepted Answer

Octahedral, $$90^\circ$$

Chemical Bonding I: Lewis Structures, Molecular Shapes, and Bond Properties

Study Guide - Practice Questions