Question 1

Which statement best describes the purpose of the VSEPR model in chemistry?

Accepted Answer

It predicts the three-dimensional shape of molecules by considering electron domain repulsion.

Question 2

According to VSEPR theory, what is the electron domain geometry around the central atom in $	ext{CO}_2$?

Accepted Answer

Linear

Question 3

A molecule has three electron domains around its central atom, one of which is a lone pair. What is the molecular geometry of this molecule?

Accepted Answer

Bent

Question 4

Which of the following molecules has a trigonal pyramidal molecular geometry?

Accepted Answer

$	ext{NH}_3$

Question 5

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

Accepted Answer

$109.5^	ext{o}$

Question 6

In the Lewis structure of ozone ($	ext{O}_3$), how many electron domains are around the central oxygen atom?

Accepted Answer

3

Question 7

Which of the following best explains why electron domains arrange themselves as far apart as possible around a central atom?

Accepted Answer

To minimize repulsion between electron domains.

Question 8

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

Accepted Answer

Bent

Question 9

Which molecule would have a bond angle closest to $120^	ext{o}$?

Accepted Answer

$	ext{BF}_3$

Question 10

If a central atom has five electron domains, what is the expected electron domain geometry?

Accepted Answer

Trigonal bipyramidal

Question 11

Which of the following statements is true regarding the difference between electron domain geometry and molecular geometry?

Accepted Answer

Electron domain geometry considers both bonding and nonbonding pairs, while molecular geometry considers only bonding pairs.

Question 12

Which molecule is an example of a linear molecular geometry?

Accepted Answer

$	ext{CO}_2$

Question 13

A molecule has three electron domains, all of which are bonding pairs. What is its molecular geometry?

Accepted Answer

Trigonal planar

Question 14

Which of the following molecules has a bent molecular geometry due to two lone pairs on the central atom?

Accepted Answer

$	ext{H}_2	ext{O}$

Question 15

What is the molecular geometry of $	ext{CH}_4$?

Accepted Answer

Tetrahedral

Question 16

Which of the following best describes the bond angles in a molecule with a trigonal planar geometry?

Accepted Answer

$120^	ext{o}$

Question 17

A molecule has four electron domains, three of which are bonding pairs and one is a lone pair. What is its molecular geometry?

Accepted Answer

Trigonal pyramidal

Question 18

Which of the following molecules would have a molecular geometry that is different from its electron domain geometry due to the presence of lone pairs?

Accepted Answer

$	ext{NH}_3$

Question 19

If a molecule has two electron domains, what is the expected bond angle between them?

Accepted Answer

$180^	ext{o}$

Question 20

Which of the following molecules is expected to have a tetrahedral electron domain geometry but a bent molecular geometry?

Accepted Answer

$	ext{H}_2	ext{O}$

VSEPR Theory and Molecular Geometry: Electron Domains and Shapes

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