AP Chem LDS

How many total valence electrons are participating in bonding in the molecule above?

• 8

• 4

• 2

• 3

CO₂ has how many lone pairs?

• 0

• 1

• 2

• 3

• 4

Which of the following is the correct Lewis dot structure for the molecule fluorine (F₂)?

• A
• B
• C
• D

The Lewis structure of the CO₃^2- ion is

• 
• 
• 
• 
• 

The Lewis structure of N₂H₂ shows __________.

• a nitrogen-nitrogen triple bond

• a nitrogen-nitrogen single bond

• each nitrogen has one lone pair

• each nitrogen has two lone pairs

• each hydrogen has one lone pair

In the nitrite ion (NO₂^-), __________.

• both bonds are single bonds

• both bonds are double bonds

• both bonds are the same because of resonance

• there are 20 valence electrons

• there is one single and one double bond

Resonance structures differ by __________.

• number and placement of electrons

• number of electrons only

• placement of atoms only

• number of atoms only

• placement of electrons only

A valid Lewis structure of _______ cannot be drawn without violating the octet rule.

• NF₃

• IF₃

• PF₃

• SbF₃

• SO₄^2-

The formal charge on carbon in the molecule shown is _______.

• 0

• +1

• +2

• +3

• -1

In the Lewis structure of ClF, the formal charge on Cl is _______ and the formal charge on F is _______.

• 0,0

• -1, -1

• 0, -1

• -1, 0

• +1, -1