Ch. 1 - A Review of General ChemistryWorksheetSee all chapters
All Chapters
Ch. 1 - A Review of General Chemistry
Ch. 2 - Molecular Representations
Ch. 3 - Acids and Bases
Ch. 4 - Alkanes and Cycloalkanes
Ch. 5 - Chirality
Ch. 6 - Thermodynamics and Kinetics
Ch. 7 - Substitution Reactions
Ch. 8 - Elimination Reactions
Ch. 9 - Alkenes and Alkynes
Ch. 10 - Addition Reactions
Ch. 11 - Radical Reactions
Ch. 12 - Alcohols, Ethers, Epoxides and Thiols
Ch. 13 - Alcohols and Carbonyl Compounds
Ch. 14 - Synthetic Techniques
Ch. 15 - Analytical Techniques: IR, NMR, Mass Spect
Ch. 16 - Conjugated Systems
Ch. 17 - Aromaticity
Ch. 18 - Reactions of Aromatics: EAS and Beyond
Ch. 19 - Aldehydes and Ketones: Nucleophilic Addition
Ch. 20 - Carboxylic Acid Derivatives: NAS
Ch. 21 - Enolate Chemistry: Reactions at the Alpha-Carbon
Ch. 22 - Condensation Chemistry
Ch. 23 - Amines
Ch. 24 - Carbohydrates
Ch. 25 - Phenols
Ch. 26 - Amino Acids, Peptides, and Proteins

We use our knowledge of valance electrons to determine what he formal charge of the molecule will be. 

Formal and Net Charge

Concept #1: Calculating formal and net charge.

Easiest formal charge formula you will find anywhere on the internet: 

The Net Charge is the sum of all the formal charges on a molecule. 

Calculate the formal charge of the following molecule:

Concept #2: Calculate the formal charges of ALL atoms. 

Practice: Calculate the net charge of the molecule

Practice: Calculate the total charge of the molecule

Hell yeah! That’s literally all there is to know. Don’t let any professors complicate it more for you. 

Additional Problems
Identify the formal charge in each case below:
In the following structure, what are the formal charges on boron? A. B =  1+ B. B = 1– C. B = 0
In which of these Lewis structures would the sulfur be assigned a formal charge of +1?
In which of the following molecules would the net charge be equal to zero? A. I B. II C. III D. IV E. More than one of these
Assign the formal charges to the atoms of molecules B and C.
From the figure below, which of the following molecules has a formal charge of +1? a) V only b) III and V only c) III and IV only  d) II and IV only
From the figure above, which of the following molecules has a formal charge of -1? a) IV only b) I and III only c) II and IV only d) II and V only
All substances below obey the octet rule. What is the formal charge and number of lone pairs on each boxed atom? In addition, what are their hybrid orbitals (assume there is no resonance)?
Give the formal charge (if one exists) on each atom of the following:
Give the formal charge (if one exists) on each atom of the following:
Give the formal charge (if one exists) on each atom of the following:
Give the formal charge (if one exists) on each atom of the following:
For each molecule shown below, determine the formal charge for the indicated atoms. Please note that for this problem all unshared electrons are shown.
Add any unshared electrons to give each element an octet in its valence shell in the formulas below and indicate any formal charges. Note that all of the hydrogen atoms that are attached to heteroatoms have been drawn if they are present.
Add any unshared electrons to give each element an octet in its valence shell in the formulas below and indicate any formal charges. Note that all of the hydrogen atoms that are attached to heteroatoms have been drawn if they are present.
Add any unshared electrons to give each element an octet in its valence shell in the formulas below and indicate any formal charges. Note that all of the hydrogen atoms that are attached to heteroatoms have been drawn if they are present.
Add any unshared electrons to give each element an octet in its valence shell in the formulas below and indicate any formal charges. Note that all of the hydrogen atoms that are attached to heteroatoms have been drawn if they are present.
What is formal charge on nitrogen in nitric acid?  
Which structures have no formally charged atoms present in their structure? Circle all that apply.   
Identify any formal charges in the following structures:
Identify any formal charges in the following structures:
Identify any formal charges in the following structures:
Identify any formal charges in the following structures:
Assign the formal charge and oxidation state to the butoxide oxygen. What is the formal charge of oxygen? What is the oxidation state of oxygen?