Deck 9: Covalent Bonding and Molecules

Question 1

A ClO₂^- ion has _____ valence electrons.

A) 16
B) 18
C) 20
D) 22

Answer 1

20

Question 2

Which Lewis structure,although acceptable,LEAST describes the carbonate ion?

A) a
B) b
C) c
D) d

Answer 2

b

Question 3

Which compound has an expanded octet around the central atom?

A) NH₃
B) PCl₃
C) SF₆
D) CF₄

Answer 3

SF₆

Question 4

What is the formal charge on the nitrogen atom in this structure?

A) +1
B) +2
C) -1
D) -3

Question 5

Ozone has the formula O₃.Which statement is CORRECT concerning ozone?

A) One oxygen atom has a +1 formal charge while another has a -1 formal charge.The third one is neutral.
B) All three atoms are neutral.
C) Two atoms have a -1 formal charge,and the third oxygen atom has a +1 formal charge.
D) Two atoms have a +1 formal charge,and the third oxygen atom has a -1 formal charge.

Question 6

How many atoms in this molecule have a tetrahedral geometry?

A) one
B) two
C) three
D) four

Question 7

How many atoms in this molecule have a trigonal planar geometry?

A) one
B) two
C) three
D) four

Question 8

What is the electronic geometry around the central atom in CO₂?

A) trigonal planar
B) linear
C) tetrahedral
D) bent

Question 9

The Lewis structure of the cyanide ion is shown here.How many valence electrons are in this ion?

A) 11
B) 10
C) 8
D) 7

Question 10

Which molecule does NOT have a lone pair on the central atom?

A) NH₃
B) SF₂
C) PCl₃
D) CO₂

Question 11

Which statement is CORRECT concerning the cyanide ion?

A) The carbon atom has a tetrahedral geometry,and the nitrogen atom has a liner geometry.
B) The carbon atom has a trigonal planar geometry,and the nitrogen atom has a liner geometry.
C) Both atoms have a linear geometry.
D) Both atoms have a trigonal planar geometry.

Question 12

A phosphorus atom with four bonds has a charge of:

A) +1.
B) +2.
C) -1.
D) -2.

Question 13

What is the formal charge on the oxygen atom in this structure?

A) +1
B) +2
C) -1
D) -2

Question 14

In this Lewis structure,which atom does NOT have a complete valence?

A) H
B) B
C) C
D) Cl

Question 15

Which Lewis structure BEST describes the carbonate ion?

A) a
B) b
C) c
D) d

Question 16

Which compound has 24 valence electrons?

A) C₃H₆O
B) C₂H₆O
C) CO₂
D) HCN

Question 17

A neutral carbon atom has _____ valence electrons.

A) two
B) four
C) five
D) eight

Question 18

A oxygen atom with one bond and three lone pairs has a charge of:

A) +1.
B) +2.
C) -1.
D) -2.

Question 19

A neutral sulfur atom has _____ valence electrons.

A) two
B) four
C) six
D) eight

Question 20

What is the electronic geometry around the oxygen atoms in CO₂?

A) trigonal planar
B) linear
C) tetrahedral
D) bent

Question 21

Which atom is the MOST electronegative?

A) Ca
B) Sr
C) Ba
D) Be

Question 22

Which structure BEST describes the polarity of an H-O bond?

A) a
B) b
C) c

Question 23

Which molecule(s)is/are likely to be a gas at room temperature due to a lack of attraction to another molecule of its own kind?

A) a,b,and c
B) a,c,and d
C) b
D) c and d

Question 24

What is the correct ELECTRONIC GEOMETRY and MOLECULAR GEOMETRY around the central nitrogen in NO₂^-? (Hint: You may need to draw the molecule.)

A) tetrahedral,trigonal pyramidal
B) tetrahedral,tetrahedral
C) linear,linear
D) trigonal planar,bent

Question 25

Which molecule has a NET DIPOLE?

A) a
B) b
C) c
D) d

Question 26

Based on the Pauling electronegativities,an Fr-F bond is:

A) ionic.
B) covalent.
C) polar ionic.
D) polar covalent.

Question 27

Based on the Pauling electronegativities,a C-H bond is:

A) ionic.
B) covalent.
C) polar ionic.
D) polar covalent.

Question 28

Which molecule will have the STRONGEST attraction to another molecule of its own kind?

A) a
B) b
C) c
D) d

Question 29

Based on the Pauling electronegativities,a P-Cl bond is:

A) ionic.
B) covalent.
C) polar ionic.
D) polar covalent.

Question 30

Which atom is the MOST electronegative?

A) Li
B) C
C) P
D) O