Formal Charge and Valence Electrons

The video tutorial explains how to calculate the formal charge for each atom in a water molecule (H2O). It begins with an introduction to the concept of formal charge and the equation used for its calculation. The tutorial then provides a detailed, step-by-step calculation of the formal charge for hydrogen and oxygen atoms in the molecule. The formal charge for both hydrogen atoms is determined to be zero, as is the formal charge for the oxygen atom. The video concludes with a summary of the calculations and the importance of understanding formal charge in chemistry.

What is the first step in calculating the formal charge of an atom?

• Calculate the atomic mass

• Count the total number of electrons

• Determine the number of valence electrons

• Identify the atomic number

How many valence electrons does hydrogen have?

• Three

• Four

• Two

• One

What is the formal charge of hydrogen in H2O?

• 1

• 0

• -1

• 2

Which group is oxygen in on the periodic table?

• Group 18

• Group 2

• Group 16

• Group 1

How many unbonded valence electrons does oxygen have in H2O?

• Three

• Five

• Four

• Two

What is the formal charge of oxygen in H2O?

• -1

• 2

• 0

• 1

What is the total formal charge of the H2O molecule?

• 1

• -1

• 2

• 0

What does the formal charge calculation help illustrate in a molecule?

• The color of the molecule

• The stability of the molecule

• The boiling point of the molecule

• The molecular weight