Question 1

Which of the following statements best describes the purpose of VSEPR theory in predicting molecular geometry?

Accepted Answer

VSEPR theory predicts the three-dimensional arrangement of atoms in a molecule by minimizing electron pair repulsion.

Question 2

Given the Lewis structure for $$\mathrm{CO_2$}$$, which statement correctly describes its molecular geometry and polarity?

Accepted Answer

The molecule is linear and nonpolar because the dipoles cancel out.

Question 3

Which of the following is the correct formal charge for the oxygen atom in the nitrate ion $$\mathrm{NO_3$^-}$$, given its most stable Lewis structure?

Accepted Answer

$$-1$$

Question 4

A molecule of $$\mathrm{NH_3$} ($$ammonia) has which of the following molecular shapes according to VSEPR theory?

Accepted Answer

Trigonal pyramidal

Question 5

Which of the following best explains why $$\mathrm{H_2O} is a $$polar molecule?

Accepted Answer

It has a bent geometry and a difference in electronegativity between hydrogen and oxygen.

Question 6

Which of the following is the correct Lewis structure for the $$\mathrm{CH_4$}$$ molecule?

Accepted Answer

Carbon atom with four single bonds to hydrogen atoms and no lone pairs on carbon.

Question 7

Which of the following molecules contains a triple bond in its Lewis structure?

Accepted Answer

$$\mathrm{N_2$}$$

Question 8

What is the electron domain geometry around the central atom in $$\mathrm{BF_3$}$$?

Accepted Answer

Trigonal planar

Question 9

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons between atoms.

Question 10

Which of the following statements about dipole moments is correct?

Accepted Answer

A molecule with polar bonds and an asymmetrical shape will have a net dipole moment.

Question 11

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

Accepted Answer

$$\mathrm{H_2O}$$

Question 12

Which of the following is the correct order of increasing electronegativity for the elements: $$\mathrm{Na}$$, $$\mathrm{Cl}$$, $$\mathrm{F}$$?

Accepted Answer

$$\mathrm{Na \u003c Cl \u003c F}$$

Question 13

A student draws the Lewis structure for $$\mathrm{SO_2$}$$ and assigns formal charges. Which atom is most likely to have a nonzero formal charge in the most stable structure?

Accepted Answer

Sulfur

Question 14

Which of the following best describes the bonding in $$\mathrm{O_3$} ($$ozone)?

Accepted Answer

Ozone contains a single bond and a double bond that are delocalized over the molecule.

Question 15

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

Accepted Answer

$$\mathrm{CO_2$}$$

Question 16

Which of the following is the correct formula for calculating the formal charge on an atom in a Lewis structure?

Accepted Answer

$$\mathrm{Formal\ Charge = (Valence\ electrons) - (Nonbonding\ electrons) - \frac{1}{2}(Bonding\ electrons)}$$

Question 17

A molecule has the formula $$\mathrm{C_2H_2} ($$ethyne). What type of bond exists between the two carbon atoms?

Accepted Answer

Triple bond

Question 18

Which of the following best explains why $$\mathrm{CH_4$} is $$nonpolar?

Accepted Answer

It has nonpolar bonds and a symmetrical tetrahedral geometry.

Question 19

Which of the following statements about resonance structures is correct?

Accepted Answer

Resonance structures are different possible arrangements of electrons in a molecule, not different compounds.

Question 20

Which of the following molecules has a dipole moment?

Accepted Answer

$$\mathrm{NH_3$}$$

Chemical Bonding, Molecular Geometry, and Bonding Theories: Study Guide

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