Chapter 8 And 15

Question 1

What does VSEPR stand for?

Answer 1

Valence-Shell Electron-Pair Repulsion

Question 2

What is the main purpose of the VSEPR model?

Answer 2

To predict the 3D structure of molecules by minimizing repulsions

Question 3

In VSEPR notation, what does ‘A’ represent?

Answer 3

The central atom

Question 4

In VSEPR notation, what does ‘X’ represent?

Answer 4

Bonded atoms

Question 5

In VSEPR notation, what does ‘E’ represent?

Answer 5

Lone pairs of electrons

Question 6

What is the electron group geometry for AX2?

Answer 6

Linear

Question 7

What is the molecular geometry for AX2?

Answer 7

Linear

Question 8

What is the electron group geometry for AX3?

Answer 8

Trigonal planar

Question 9

What is the molecular geometry for AX3?

Answer 9

Trigonal planar

Question 10

What is the molecular geometry for AX2E1?

Answer 10

Bent

Question 11

What is the electron group geometry for AX4?

Answer 11

Tetrahedral

Question 12

What is the molecular geometry for AX4?

Answer 12

Tetrahedral

Question 13

What is the molecular geometry for AX3E1?

Answer 13

Trigonal pyramidal

Question 14

What is the molecular geometry for AX2E2?

Answer 14

Bent

Question 15

What are the two major varieties of covalent bonds?

Answer 15

Nonpolar (Pure) Covalent and Polar Covalent

Question 16

What characterizes a Nonpolar (Pure) Covalent bond?

Answer 16

Electronegativity difference Δx < 0.5

Question 17

What characterizes a Polar Covalent bond?

Answer 17

Electronegativity difference Δx = 0.5 - 1.4

Question 18

What is the dipole moment?

Answer 18

The vector sum of the individual bond dipoles

Question 19

What are London Dispersion Forces?

Answer 19

Short-lived attractive forces between nonpolar compounds

Question 20

How do London Dispersion Forces change with mass?

Answer 20

They tend to increase with an increase in mass

Question 21

What is polarizability?

Answer 21

The ease with which an atom/molecule can change its electron distribution

Question 22

What are Dipole-Dipole interactions?

Answer 22

Forces generated when two polar molecules interact based on dipole alignment

Question 23

What defines a Hydrogen Bond?

Answer 23

A bond between hydrogen and a very electronegative atom (N, O, or F)

Question 24

What are the major effects of Intermolecular Forces?

Answer 24

Melting Points, Boiling Points, Vapor Pressure, Solubility

Question 25

How does IMF strength relate to melting point?

Answer 25

Stronger IMFs means higher melting points

Question 26

How does IMF strength relate to boiling point?

Answer 26

Stronger IMFs means higher boiling points

Question 27

How does IMF strength relate to vapor pressure?

Answer 27

Stronger IMFs means lower vapor pressure

Question 28

What does 'like-dissolves-like' refer to?

Answer 28

Molecules with similar polarities/IMFs are more likely to be miscible

Question 29

Fill in the blank: Molecules with dissimilar polarities/IMFs are more likely to be _______.

Answer 29

insoluble