Chapter 7 Test

Which of the following is a correct Lewis structure for oxygen?

• 
• 
• 
• 

Which of these are correct resonance structures of N₂O₄?

• 1 & 2

• 1, 2, & 3

• 2, 3, & 4

• 1, 2, 3, & 4

fluoride ion, F^–, has _____ valence electrons.

• 8

• 7

• 10

• 6

• 9

Formal charge is

• the difference between the number of lone pairs of electrons and shared pairs of electrons on any atom in a Lewis structure.

• the absolute value of the charge on a polyatomic anion or cation.

• the difference between the number of valence electrons and the number of protons in any given atom.

• the difference between the number of valence electrons in a free atom and the number of electrons assigned to the atom in a Lewis structure.

• equal to the number of valence electrons in a free atom minus the number of shared in covalent bonds.

A pair of electrons that is shared between two atoms is

• a covalent bond.

• both a covalent bond and a double bond.

• a lone pair.

• a double bond.

• an ionic bond.

What is the formal charge on each atom in CN^-?

• C = 0, N = 0

• C = -1, N = 0

• C = +4, N = -5

• C = +2, N = -3

• C = +1, N = -1

Which of the following is/are possible Lewis structures for C₂H₆O?

• 1

• 2

• 3

• 2 & 3

• 1, 2, & 3

Which of the following molecules or ions will have a Lewis structure most like that of phosphorus trichloride, PCl₃?

• Cl₂CO

• ClO₃^–

• SO₃

• CO₃^2–

• BF₃

Which of the following are correct resonance structures of SO₃?

• 1 & 5

• 2 & 4

• 1, 2, & 4

• 2, 3, & 4

• 1, 2, 4, 7 5

Which of the following is a correct Lewis structure for PH₃?

• a

• b

• c

• d

• e