$$\mathrm{[O-C(=O)-O]^{2-}}$$ \,\text{with resonance between all three oxygens}$

Question 1

Which of the following Lewis structures correctly represents the carbonate ion ($$\mathrm{CO_3$^{2-}}$$)?

Accepted Answer

$$\mathrm{[O-C(=O)-O]^{2-}}$$ \,	ext{with resonance between all three oxygens}$

Question 2

Which of the following molecules does NOT contain a carbon-oxygen double bond?

Accepted Answer

$$\mathrm{CH_3OH}$$

Question 3

How many sigma ($$\sigma) $$bonds and how many pi ($$\pi) $$bonds are present in the molecule below?

$$\mathrm{CH_2$=CH-CH_3$}$$

Accepted Answer

8 $$\sigma$$ bonds, 1 $$\pi$$ bond

Question 4

Which compound has the strongest carbon-carbon triple bond?

Accepted Answer

$$\mathrm{C_2H_2}$$

Question 5

Assign a formal charge to the nitrogen atom in the thiocyanate ion ($$\mathrm{SCN^-}) $$given the following Lewis structure:

$$\mathrm{S=C=N^-}$$

Accepted Answer

-1

Question 6

Which of the following best describes the molecular geometry of $$\mathrm{BF_3$}$$?

Accepted Answer

Trigonal planar

Question 7

A central atom in a three-atom molecule forms two single bonds and possesses two lone pairs of electrons. What is its molecular geometry?

Accepted Answer

Bent

Question 8

Which of the following molecules adopts a tetrahedral geometry?

Accepted Answer

$$\mathrm{CH_4$}$$

Question 9

Which of the following molecules adopts a bent geometry?

Accepted Answer

$$\mathrm{H_2O}$$

Question 10

Which part of a water molecule produces an ionic bond?

Accepted Answer

None; water forms covalent bonds

Question 11

Which part of a water molecule produces a polar covalent bond?

Accepted Answer

Between hydrogen and oxygen atoms

Question 12

Which of the following Lewis structures is correct for $$\mathrm{CO_2$}$$?

Accepted Answer

$$\mathrm{O=C=O}$$

Question 13

Which of the following Lewis structures is correct for $$\mathrm{C_2H_2}$$?

Accepted Answer

$$\mathrm{H-C\equiv C-H}$$

Question 14

Which of the following molecular geometries can be described as containing a central atom that possesses two lone pairs of electrons?

Accepted Answer

Bent

Question 15

A molecule consists of two atoms (A-B), where $$A = 1$$, $$B = 4$$, $$A \u003c B. $$Which of the following best describes its geometry?

Accepted Answer

Linear

Question 16

During the hybridization of the central atom in $$\mathrm{CH_4$}$$, which orbitals are involved?

Accepted Answer

$$sp^3$$

Question 17

Which of the following best describes the bond angles in $$\mathrm{NH_3$}$$?

Accepted Answer

Approximately $$107^{\circ}$$

Question 18

Which of the following molecules contains a central atom with no lone pairs and three surrounding atoms?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 19

Which of the following molecules contains a central atom with one lone pair and three surrounding atoms?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 20

Which of the following molecules contains a central atom with two lone pairs and two surrounding atoms?

Accepted Answer

$$\mathrm{H_2O}$$

General Chemistry Study Notes: Chemical Bonding, Lewis Structures, and Molecular Geometry

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