Lewis Structures and Formal Charges

The video tutorial explains how to draw the Lewis structure for iodic acid (HI03). It begins by identifying the molecule as an acid due to the presence of hydrogen. The iodine atom is placed at the center, with oxygen atoms surrounding it, and hydrogen is placed on the outside of one oxygen. The tutorial details the use of 26 valence electrons to form chemical bonds and complete octets. It then calculates formal charges for each atom, finding that adjustments are needed to achieve charges closer to zero. By forming double bonds, the structure is optimized, resulting in zero formal charges for all atoms. The video concludes with a note on iodine's ability to have an expanded octet.

What is the central atom in the Lewis structure of HIO3?

• Carbon

• Iodine

• Oxygen

• Hydrogen

Why is hydrogen placed on the outside of an oxygen in the Lewis structure of HIO3?

• Because it is more electronegative

• Because it is an acid

• Because it forms a double bond

• Because it has more valence electrons

How many valence electrons are used to form chemical bonds in HIO3?

• 8

• 10

• 24

• 26

What is the formal charge on iodine in the initial Lewis structure of HIO3?

• -1

• 0

• +2

• +1

Which oxygen atom has a formal charge of zero in the initial structure?

• All oxygen atoms

• Oxygen on the left

• Oxygen bonded to hydrogen

• Oxygen on the right

What adjustment is made to achieve formal charges of zero on all atoms?

• Changing the central atom

• Adding more electrons

• Forming double bonds

• Removing electrons

Why is it acceptable for iodine to have more than an octet in the final structure?

• Because it is highly reactive

• Because it is below period 2 on the periodic table

• Because it is a noble gas

• Because it is in period 1

What is the final formal charge on iodine after adjustments?

• +2

• -1

• 0

• +1

What is the significance of achieving formal charges of zero in a Lewis structure?

• It shows the structure is an acid

• It means the structure is incorrect

• It suggests the structure is a base

• It indicates a stable structure

What is the role of double bonds in the final Lewis structure of HIO3?

• To change the central atom

• To increase the number of valence electrons

• To decrease the number of valence electrons

• To achieve zero formal charges