Formal Charges and Valence Electrons

The video tutorial explains how to calculate formal charges for each element in the carbonate ion (CO3 2-). It uses a Lewis structure and a specific equation to determine the formal charges on oxygen atoms with single and double bonds, as well as on the carbon atom. The tutorial also discusses resonance structures and concludes with a summary of the formal charges for the carbonate ion.

What is the purpose of using a Lewis structure in calculating formal charges?

• To predict the color of the compound

• To visualize the arrangement of electrons

• To determine the molecular geometry

• To calculate the molecular weight

How many valence electrons does an oxygen atom in group 16 have?

• 8

• 6

• 2

• 4

What is the formal charge on an oxygen atom with a single bond in the carbonate ion?

• 0

• +1

• -1

• -2

How many valence electrons does carbon have in group 14?

• 2

• 4

• 6

• 8

What is the formal charge on the carbon atom in the carbonate ion?

• +1

• 0

• -1

• -2

How many unbonded valence electrons does the double-bonded oxygen have?

• 6

• 4

• 2

• 8

What is the formal charge on the oxygen atom with a double bond in the carbonate ion?

• +1

• -2

• 0

• -1

What is the overall charge of the carbonate ion?

• +1

• -2

• 0

• -1

What is a resonance structure?

• A structure with different arrangements of electrons

• A structure with different colors

• A structure with different atomic numbers

• A structure with different molecular weights

In resonance structures, what is the formal charge on the oxygen with a double bond?

• +1

• -2

• 0

• -1