MOLECULAR STRUCTURE
 (Quiz 1-1)

1. What is the ground-state electronic configuration of an oxygen atom (oxygen: atomic number 8)?

(A) 1s²2s¹2p⁵

(B) 1s²2s²2p⁴

(C) 1s¹2s¹2p⁶

(D) 1s²2s²2p²

2. Which of the following species has an atom that has an unfilled valence shell of electrons?

(A) molecular hydrogen, H₂

(B) hydroxide anion, HO^-

(C) boron trifluoride, BF₃

(D) water, H₂O

3. Which of the following species possesses a formal charge?

(A) BH₃

(B) BH₄

(C) CCl₄

(D) H₂S

4. Which of the following molecules is not linear?

(A) H₂O

(B) CO₂

(C) HCCH

(D) Cl₂

5. What is the approximate C-C-C bond angle in propene, CH₃CH=CH₂?

(A) 90°

(B) 109°

(C) 120°

(D) 180°

6. Which of the following represents the shape of a 2p atomic orbital of carbon?

(A) 1

(B) 2

(C) 3

(D) 4

7. Which of the following represents an sp³ hybridized atomic orbital containing the lone pair of electrons of ammonia, NH₃?

(A) 1

(B) 2

(C) 3

(D)4

8. Which atomic orbitals overlap to form the C-H bonding molecular orbitals of ethane, CH₃CH₃?

(A) C2p + H1s

(B) Csp + H1s

(C) Csp² + H1s

(D) Csp³ + H1s

9. Which atomic orbitals overlap to form the carbon-carbon bonding molecular orbitals of ethene, H₂C=CH₂?

(A) Csp³ + Csp³, and C2p + C2p

(B) Csp² + Csp², and Csp²+ Csp²

(C) Csp² + Csp², and C2p + C2p

(D) Csp³ + Csp³, and Csp²+ Csp²

10. Which atomic orbitals overlap to form the carbon-carbon molecular s-bonding orbital of ethyne, HCºCH?

(A) C2p + C2p

(B) Csp + Csp

(C) Csp² + Csp²

(D) Csp³ + Csp³