Search Header Logo
Lewis Structures and Formal Charges

Lewis Structures and Formal Charges

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Practice Problem

Hard

Created by

Jackson Turner

FREE Resource

The video tutorial explains the Lewis structure of H3PO4, Phosphoric Acid. It begins by identifying the total valence electrons and arranging the atoms with Phosphorus at the center. The tutorial discusses the formation of OH groups and the use of valence electrons to achieve full outer shells for each atom. It emphasizes the importance of formal charges and demonstrates how to adjust them by forming a double bond between Phosphorus and Oxygen. The final structure is presented with optimal formal charges, making it the most plausible Lewis structure for H3PO4.

Read more

8 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the total number of valence electrons in H3PO4?

28

30

32

34

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Where are the hydrogen atoms typically attached in the structure of H3PO4?

To the oxygen atoms forming OH groups

To the sulfur atom

To the phosphorus atom

To the nitrogen atom

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many valence electrons are used to form chemical bonds in H3PO4?

24

32

40

14

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the formal charge on phosphorus before adjusting the Lewis structure?

+1

0

-1

+2

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which element in H3PO4 can have an expanded octet?

Hydrogen

Oxygen

Phosphorus

Nitrogen

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the formal charge on the oxygen atom before forming a double bond with phosphorus?

0

-1

+1

-2

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What change is made to the Lewis structure to achieve zero formal charges?

Adding more valence electrons

Forming a double bond between oxygen and phosphorus

Removing an oxygen atom

Adding more hydrogen atoms

Access all questions and much more by creating a free account

Create resources

Host any resource

Get auto-graded reports

Google

Continue with Google

Email

Continue with Email

Classlink

Continue with Classlink

Clever

Continue with Clever

or continue with

Microsoft

Microsoft

Apple

Apple

Others

Others

Already have an account?