Lewis Structures and Formal Charges in HNO3

The video tutorial explains how to draw the Lewis structure for nitric acid (HNO3). It begins by counting the valence electrons using the periodic table, then arranges the atoms with nitrogen at the center and hydrogen on the outside. The tutorial demonstrates forming chemical bonds and completing the octets for each atom. It discusses adjusting electrons to form a double bond, ensuring the structure uses all 24 valence electrons. The video concludes by analyzing formal charges to validate the best Lewis structure for HNO3, emphasizing the importance of minimizing formal charges.

What is the total number of valence electrons in HNO3?

• 18

• 22

• 24

• 20

Which atom is placed at the center of the HNO3 Lewis structure?

• Carbon

• Nitrogen

• Oxygen

• Hydrogen

Where is the hydrogen atom placed in the Lewis structure of HNO3?

• Next to another hydrogen

• At the center

• Next to one of the oxygens

• Next to nitrogen

How many valence electrons are used to form chemical bonds initially in HNO3?

• 10

• 8

• 6

• 12

What is the purpose of moving two electrons to form a double bond in the HNO3 structure?

• To complete the octet for nitrogen

• To increase the number of valence electrons

• To reduce the number of oxygen atoms

• To add more hydrogen atoms

What is the formal charge on the nitrogen atom in the best Lewis structure of HNO3?

• +1

• 0

• -1

• +2

Why is it important for formal charges to be as close to zero as possible?

• To decrease the number of bonds

• To increase the molecular weight

• To make the molecule more reactive

• To stabilize the molecule

What is the formal charge on the oxygen atom in the best Lewis structure of HNO3?

• 0

• +2

• +1

• -1

In an alternative Lewis structure of HNO3, what is the formal charge on the nitrogen atom?

• -1

• +2

• 0

• +1

What is the overall charge of the HNO3 molecule?

• +1

• 0

• +2

• -1