Understanding Lewis Structures and Formal Charges

What is the first step in drawing a Lewis structure?

• Determine the formal charges

• Draw the skeleton structure

• Calculate the number of valence electrons

• Identify the polar bonds

Why is the molecular formula of ethanol written as CH3CH2OH?

• To show the molecular weight

• To simplify the chemical formula

• To indicate the connectivity of atoms

• To highlight the number of hydrogen atoms

How many valence electrons are present in ethanol?

• 24

• 22

• 20

• 18

Which bonds in ethanol are considered nonpolar?

• C-H bonds

• C-C bonds

• C-O bonds

• O-H bonds

What is the total number of valence electrons in ClO4-?

• 34

• 32

• 30

• 28

In ClO4-, which rule is considered more important than the octet rule?

• Valence electron rule

• Formal charge rule

• Bond polarity rule

• Electronegativity rule

What is the formal charge on the chlorine atom in ClO4-?

• -1

• 0

• +2

• +1

How many valence electrons are there in PS3-?

• 28

• 24

• 26

• 22

Why is it better to place the negative formal charge on sulfur rather than phosphorus in PS3-?

• Sulfur is more electronegative

• Phosphorus has more valence electrons

• Phosphorus is a central atom

• Sulfur is less electronegative

What is the formal charge on phosphorus in PS3- when the octet rule is broken?

• +2

• +1

• 0

• -1