Question 1

Which of the following statements best describes the octet rule as it applies to chemical bonding?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve a total of eight valence electrons.

Question 2

Which molecule below has a linear molecular geometry according to VSEPR theory?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 3

Given the Lewis structure for $$\mathrm{NH_3$}$$, what is the molecular shape and approximate bond angle?

Accepted Answer

Trigonal pyramidal, $$107^\circ$$

Question 4

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

Accepted Answer

$$\mathrm{CO_2$}$$

Question 5

A student draws the Lewis structure for $$\mathrm{SO_2$}$$ and predicts its shape. Which of the following is correct?

Accepted Answer

Bent, due to one lone pair on the central atom

Question 6

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

Accepted Answer

It has a bent shape and the oxygen atom is more electronegative than hydrogen.

Question 7

Which of the following ions has the same electron configuration as neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{O$$^{2-}$$}$$

Question 8

Which of the following molecules has a trigonal planar shape?

Accepted Answer

$$\mathrm{CO_3$^{2-}}$$

Question 9

A molecule has the following Lewis structure: $$\mathrm{$$ClO_3$$^-}. $$What is its electron geometry and molecular shape?

Accepted Answer

Tetrahedral electron geometry, trigonal pyramidal molecular shape

Question 10

Which of the following best describes the polarity of $$\mathrm{CH_4$}$$?

Accepted Answer

Nonpolar, because the molecule is symmetrical and the bond dipoles cancel

Question 11

Which of the following molecules contains a coordinate covalent bond?

Accepted Answer

$$\mathrm{NH_4$^+}$$

Question 12

Which of the following best describes the electron domain geometry and molecular geometry of $$\mathrm{SO_3$}$$?

Accepted Answer

Trigonal planar for both electron domain and molecular geometry

Question 13

Which of the following molecules is expected to have the largest bond angle?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 14

Which of the following best explains why $$\mathrm{CO_2$} is $$nonpolar even though it contains polar bonds?

Accepted Answer

The molecule is linear and the bond dipoles cancel each other out.

Question 15

Which of the following molecules has a lone pair on the central atom and is polar?

Accepted Answer

$$\mathrm{H_2O}$$

Question 16

Which of the following best describes the bonding in $$\mathrm{CO_3$^{2-}}$$?

Accepted Answer

Resonance structures with delocalized electrons

Question 17

A molecule has the formula $$\mathrm{$$PCl_3$$}. $$What is its molecular geometry and is it polar?

Accepted Answer

Trigonal pyramidal, polar

Question 18

Which of the following best describes the electron dot structure for $$\mathrm{$$ClO_3$$^-}$$?

Accepted Answer

Central Cl atom with three O atoms, one lone pair on Cl, and resonance among the O atoms

Question 19

Which of the following molecules is expected to have a dipole moment?

Accepted Answer

$$\mathrm{SO_2$}$$

Question 20

Which of the following best describes the shape and polarity of $$\mathrm{CH_2O} ($$formaldehyde)?

Accepted Answer

Trigonal planar, polar

Study Notes: Chemical Bonding (Chapter 10)

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