Chapter 1.4: Bond Angles and Shape of Molecules

Question 1

How many regions of electron density are around the central atom in a structure that has a predicted bond angle of 120°?

Answer 1

3

Question 2

What is a method for predicting bond angles based on the idea that electron pairs repel each other and keep as far apart as possible?

Answer 2

• Valence-Shell Electron-Pair Repulsion

Question 3

What is the predicted bond angle of a structure that has 3 regions of electron density around central atom?

Answer 3

120°

Question 4

How many regions of electron density are around the central atom in a structure that has a linear arrangement?

Answer 4

2

Question 5

Define tetrahedral

Answer 5

a bonding arrangement in which an atom is bonded to four atoms located at the corners of a tetrahedron

Question 6

What is the predicted distribution of electron density of a structure that has 2 regions of electron density around central atom?

Answer 6

linear

Question 7

How many regions of electron density are around the central atom in a structure that has a predicted bond angle of 109.5°?

Answer 7

4

Question 8

What is the predicted distribution of electron density of a structure that has 4 regions of electron density around central atom?

Answer 8

tetrahedral

Question 9

Define pyramidal

Answer 9

a bonding arrangement in which an atom is bonded to three atoms in a triangular pyramid

Question 10

What is a bonding arrangement in which an atom is bonded to four atoms located at the corners of a tetrahedron ?

Answer 10

tetrahedral

Question 11

Define • Valence-Shell Electron-Pair Repulsion

Answer 11

a method for predicting bond angles based on the idea that electron pairs repel each other and keep as far apart as possible

Question 12

What is the predicted bond angle of a structure that has 2 regions of electron density around central atom?

Answer 12

180°

Question 13

How many regions of electron density are around the central atom in a structure that has a tetrahedral arrangement?

Answer 13

4

Question 14

What is the predicted bond angle of a structure that has 4 regions of electron density around central atom?

Answer 14

109.5°

Question 15

• According to VSEPR, a double bond is treated as a …

Answer 15

single region of electron density

Question 16

How many regions of electron density are around the central atom in a structure that has a trigonal planar arrangement?

Answer 16

3

Question 17

What is the predicted distribution of electron density of a structure that has 3 regions of electron density around central atom?

Answer 17

trigonal planar

Question 18

What is a bonding arrangement in which an atom is bonded to three atoms in a triangular pyramid?

Answer 18

pyramidal

Question 19

How many regions of electron density are around the central atom in a structure that has a predicted bond angle of 180°?

Answer 19

2