Question 1

Which of the following statements best explains why sodium chloride ($$\mathrm{NaCl}) is $$classified as an ionic compound?

Accepted Answer

Because it is formed by the transfer of electrons from sodium to chlorine, resulting in oppositely charged ions held together by electrostatic attraction.

Question 2

Which of the following pairs of elements is most likely to form a polar covalent bond?

Accepted Answer

Carbon and oxygen

Question 3

What is the correct formula for the compound formed between aluminum and sulfate ions?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 4

Which of the following molecules has a linear molecular geometry according to VSEPR theory?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 5

Which of the following correctly ranks the bonds in order of increasing polarity?

Accepted Answer

$$\mathrm{C-H} \u003c \mathrm{N-H} \u003c \mathrm{O-H}$$

Question 6

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

Accepted Answer

$$\mathrm{Na^+}$$

Question 7

What is the formal charge on the central atom in the Lewis structure of $$\mathrm{NO_3$^-} ($$nitrate ion) if all three oxygens are singly bonded to nitrogen and each oxygen has three lone pairs?

Accepted Answer

$$+1$$

Question 8

Which of the following molecules or ions is expected to be paramagnetic according to molecular orbital theory?

Accepted Answer

$$\mathrm{O_2$}$$

Question 9

Which of the following best describes the bonding in $$\mathrm{C_2H_2} ($$acetylene)?

Accepted Answer

Each carbon is $$\mathrm{sp}$$ hybridized and forms a triple bond with the other carbon.

Question 10

Which of the following is the correct name for $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 11

A molecule has the following Lewis structure: the central atom has three bonding pairs and one lone pair. What is the molecular geometry and the ideal bond angle?

Accepted Answer

Trigonal pyramidal, $$107^\circ$$

Question 12

Which of the following is an exception to the octet rule due to an incomplete octet?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 13

How many $$\sigma$$ and $$\pi$$ bonds are present in a molecule of $$\mathrm{C_2H_4} ($$ethylene)?

Accepted Answer

5 $$\sigma$$ and 1 $$\pi$$

Question 14

Which of the following correctly describes the molecular polarity of $$\mathrm{CO_2$}$$?

Accepted Answer

Nonpolar, because the bond dipoles cancel due to linear geometry.

Question 15

Which of the following is the correct electron configuration for the oxide ion ($$\mathrm{O$$^{2-}$$}$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$

Question 16

Which of the following best explains why $$\mathrm{O_2$} is $$paramagnetic?

Accepted Answer

Because it has unpaired electrons in its $$\pi^*$$ molecular orbitals.

Question 17

Which of the following is the correct name for $$\mathrm{H_2SO_4}$$?

Accepted Answer

Sulfuric acid

Question 18

Which of the following best describes the resonance in the carbonate ion ($$\mathrm{CO_3$^{2-}}$$)?

Accepted Answer

There are three equivalent resonance structures, each with one double bond and two single bonds to oxygen.

Question 19

Which of the following is the correct formula for ammonium phosphate?

Accepted Answer

$$\mathrm{(NH_4$)_3PO_4}$$

Question 20

A patient is given a medication containing the acetate ion. What is the correct formula for acetate?

Accepted Answer

$$\mathrm{CH_3CO_2^-}$$

Chemical Bonding, Molecular Geometry, and Advanced Bonding Theories

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