Q: A molecule has three bonding groups and one lone pair on the central atom. What is its molecular geometry and approximate bond angle?

Trigonal pyramidal, $107^\circ$

Q: Which of the following statements about bond polarity is correct?

A bond is polar if the two atoms have different electronegativities.

Q: Which of the following best explains why $CO_2$ is nonpolar even though it contains polar bonds?

The molecule is linear and the bond dipoles cancel each other out.

Q: Which of the following best describes the relationship between the number of electron groups and molecular geometry?

Three electron groups can result in either trigonal planar or bent geometry.

Q: Which of the following statements about electronegativity is correct?

Electronegativity decreases down a group and increases across a period.

Q: Which of the following best describes the molecular polarity of $H_2O$?

Polar because the molecule is bent and the bond dipoles do not cancel

Q: Which of the following is the best explanation for why $CH_4$ is nonpolar?

The molecule is tetrahedral and the bond dipoles cancel due to symmetry.

Question 1

Which of the following best describes the molecular geometry of methane ($CH_4$)?

Accepted Answer

Tetrahedral with bond angles of $109.5^\circ$

Question 2

According to VSEPR theory, what is the electron group geometry around the central atom in $CO_2$?

Accepted Answer

Linear

Question 3

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

$CO_2$

Question 4

What is the correct order of increasing electronegativity for the following elements: $C$, $N$, $O$, $H$?

Accepted Answer

$H < C < N < O$

Question 5

A molecule has three bonding groups and one lone pair on the central atom. What is its molecular geometry and approximate bond angle?

Accepted Answer

Trigonal pyramidal, $107^\circ$

Question 6

Which of the following statements about bond polarity is correct?

Accepted Answer

A bond is polar if the two atoms have different electronegativities.

Question 7

Which of the following molecules has a bent molecular geometry?

Accepted Answer

$H_2O$

Question 8

Given the Lewis structure of $NH_3$, how many lone pairs are on the central atom?

Accepted Answer

1

Question 9

Which of the following best explains why $CO_2$ is nonpolar even though it contains polar bonds?

Accepted Answer

The molecule is linear and the bond dipoles cancel each other out.

Question 10

What is the molecular geometry and bond angle of $BF_3$?

Accepted Answer

Trigonal planar, $120^\circ$

Question 11

Which of the following molecules is expected to be polar?

Accepted Answer

$NH_3$

Question 12

A molecule has two bonding groups and two lone pairs on the central atom. What is its molecular geometry?

Accepted Answer

Bent

Question 13

Which of the following best describes the relationship between the number of electron groups and molecular geometry?

Accepted Answer

Three electron groups can result in either trigonal planar or bent geometry.

Question 14

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity decreases down a group and increases across a period.

Question 15

Which of the following molecules has a trigonal pyramidal geometry?

Accepted Answer

$NH_3$

Question 16

If a molecule has a central atom with four electron groups (two bonding pairs and two lone pairs), what is the expected bond angle?

Accepted Answer

$104.5^\circ$

Question 17

Which of the following best describes the molecular polarity of $H_2O$?

Accepted Answer

Polar because the molecule is bent and the bond dipoles do not cancel

Question 18

A molecule has a central atom with three bonding groups and no lone pairs. What is the molecular geometry and is the molecule polar or nonpolar?

Accepted Answer

Trigonal planar, nonpolar

Question 19

Which of the following is the best explanation for why $CH_4$ is nonpolar?

Accepted Answer

The molecule is tetrahedral and the bond dipoles cancel due to symmetry.

Question 20

Which of the following molecules would you expect to have the largest bond angle?

Accepted Answer

$CO_2$

Molecular Geometry and Molecular Polarity: Structure, Bonding, and Polarity in Molecules

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