Question 1

Which of the following is the correct Lewis symbol for an oxygen atom?

Accepted Answer

$$\cdot \cdot \cdot \ O \cdot \cdot \cdot$$

Question 2

What is the correct Lewis symbol for the $$Se^{2-}$$ anion?

Accepted Answer

$$[\cdot \cdot \cdot \cdot Se \cdot \cdot \cdot \cdot ]^{2-}$$

Question 3

Which pair of atoms will most likely form an ionic bond?

Accepted Answer

Na and Cl

Question 4

Which pair of atoms will most likely form a polar covalent bond?

Accepted Answer

C and H

Question 5

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

Accepted Answer

CH$$_3OH$$

Question 6

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

$$\ce{N\equiv C-CH=CH2}$$

Accepted Answer

5 $$\sigma$$ bonds, 2 $$\pi$$ bonds

Question 7

A Lewis structure is incomplete. When completed, the Lewis structure of the following molecule will feature which of the following?

$$\ce{CH2O}$$

Accepted Answer

At least one $$\pi$$ bond

Question 8

Which compound has the strongest carbon–carbon bond?

Accepted Answer

$$\ce{HC\equiv CH}$$

Question 9

Assign the correct formal charge to the nitrogen atom in the thiocyanate ion ($$\ce{SCN^-}$$):

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

Accepted Answer

$$0$$

Question 10

Assign the correct formal charge to the sulfur atom in the thiocyanate ion ($$\ce{SCN^-}$$):

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

Accepted Answer

$$-1$$

Question 11

Which is the best Lewis structure for carbon dioxide ($$\ce{CO2}$$)?

Accepted Answer

$$O=C=O$$

Question 12

Choose the best Lewis structure for $$\ce{CCl4}.$$

Accepted Answer

A central C atom with four single bonds to four Cl atoms, each Cl with three lone pairs

Question 13

What is the molecular geometry of $$\ce{PCl3}$$?

Accepted Answer

Trigonal pyramidal

Question 14

Which molecule adopts an octahedral geometry?

Accepted Answer

$$\ce{SF6}$$

Question 15

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 16

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

Accepted Answer

Bent and T-shaped

Question 17

A molecule consists of two atoms (AB$$_2) $$where A = 2, 3, 4, 5, or 6. Which of the following molecular geometries are possible?

Accepted Answer

Linear

Question 18

Indicate the hybridization of the central atom in $$\ce{NH3}.$$

Accepted Answer

$$sp^3$$

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

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