Question 1

Based on VSEPR theory, which of the following molecules should have the smallest XAX bond angle?

A) $\mathrm{AX_2E_2}$ (e.g., H$_2$O)
B) $\mathrm{AX_3E}$ (e.g., NH$_3$)
C) $\mathrm{AX_4}$ (e.g., CH$_4$)
D) $\mathrm{AX_2}$ (e.g., CO$_2$)

Accepted Answer

$\mathrm{AX_2E_2}$ (e.g., H$_2$O)

Question 2

What is the molecular geometry of XeF$_4$? (Hint: Draw the electron-dot structure first.)

Accepted Answer

Square planar

Question 3

The bonds in the polyatomic ion CO$_3^{2-}$ are classified as:

A) Ionic
B) Metallic
C) Nonpolar covalent
D) Polar covalent

Accepted Answer

Polar covalent

Question 4

Which of the following molecules has polar bonds but has no dipole moment?

A) H$_2$O
B) CH$_3$Cl
C) CO$_2$
D) SO$_2$

Accepted Answer

CO$_2$

Question 5

In the structural formula below, what are the hybridizations of carbon a and carbon b atoms?

$\mathrm{a:} \quad \mathrm{CH_2=CH-CH_3}$

A) a: sp$^2$, b: sp$^3$
B) a: sp$^3$, b: sp$^2$
C) a: sp$^2$, b: sp$^2$
D) a: sp$^3$, b: sp$^3$

Accepted Answer

a: sp$^2$, b: sp$^3$

Question 6

In the structural formula below, what is the hybridization of the O atom?

$\mathrm{CH_3OH}$

A) sp
B) sp$^2$
C) sp$^3$
D) No hybridization

Accepted Answer

sp$^3$

Question 7

In the structural formula below, how many sigma and pi bonds are there?

$\mathrm{C_6H_6}$ (benzene)

A) 12 sigma + 3 pi
B) 6 sigma + 6 pi
C) 9 sigma + 3 pi
D) 12 sigma + 6 pi

Accepted Answer

12 sigma + 3 pi

Question 8

Which image shows the correct 3-D shape of SeF$_4$?

A) See-saw
B) Square planar
C) Tetrahedral
D) Trigonal bipyramidal

Accepted Answer

See-saw

Question 9

Which of the following molecules has a central atom with sp$^3$ hybridization?

A) CO$_2$
B) CH$_4$
C) SO$_2$
D) BF$_3$

Accepted Answer

CH$_4$

Question 10

Consider the structure below, which statement is correct?

Bond 1: C=C double bond
Bond 2: C-C single bond

A) Bond 1 is stronger
B) Bond 2 is stronger
C) Bond 1 contains two pi bonds
D) Bond 2 contains one sigma bond

Accepted Answer

Bond 1 is stronger

Question 11

Consider the following structure of the DNA base thymine. It dissolves in water due to hydrogen bonding. Which of the following hydrogen bonds between thymine and surrounding water molecules are valid?

A) I and II
B) II and IV
C) I, II, III, and IV
D) III and IV

Accepted Answer

I, II, III, and IV

Question 12

Which of the following substances experiences only London dispersion forces between its molecules?

A) H$_2$O
B) CO$_2$
C) NH$_3$
D) HCl

Accepted Answer

CO$_2$

Question 13

A sample of gas at 1.00 atm and 273 K occupies 22.4 L. If the temperature is doubled and the pressure is halved, what will be the new volume?

Use the ideal gas law: $PV = nRT$

Accepted Answer

89.6 L

Question 14

Which of the following statements about resonance structures is correct?

A) Resonance structures represent different compounds.
B) The actual molecule is best represented by one of the resonance structures.
C) Resonance structures differ only in the arrangement of electrons, not atoms.
D) Resonance structures have different numbers of electrons.

Accepted Answer

Resonance structures differ only in the arrangement of electrons, not atoms.

Question 15

Which of the following molecules is expected to have the highest boiling point?

A) CH$_4$
B) CO$_2$
C) H$_2$O
D) N$_2$

Accepted Answer

H$_2$O

Question 16

A balloon filled with helium gas at 25$^\circ$C and 1.00 atm has a volume of 2.00 L. If the temperature is increased to 50$^\circ$C at constant pressure, what is the new volume?

Use: $\frac{V_1}{T_1} = \frac{V_2}{T_2}$ (Charles's Law)

Accepted Answer

2.17 L

Question 17

Which of the following is NOT a property of ionic compounds?

A) High melting point
B) Conduct electricity in solid state
C) Brittle
D) Form crystal lattices

Accepted Answer

Conduct electricity in solid state

Question 18

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

A) NH$_3$
B) H$_2$O
C) CO$_2$
D) CH$_3$Cl

Accepted Answer

CO$_2$

Question 19

Which intermolecular force is primarily responsible for the high boiling point of water?

A) London dispersion forces
B) Dipole-dipole interactions
C) Hydrogen bonding
D) Ionic bonding

Accepted Answer

Hydrogen bonding

Question 20

Which of the following best explains why ice floats on water?

A) Ice is denser than water due to hydrogen bonding
B) Ice is less dense than water because its molecules are more closely packed
C) Ice is less dense than water due to the open hexagonal structure formed by hydrogen bonds
D) Ice is less dense than water because of ionic interactions

Accepted Answer

Ice is less dense than water due to the open hexagonal structure formed by hydrogen bonds

General Chemistry: Molecular Structure, Bonding, and Intermolecular Forces (Mock Quiz Review)

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