Lewis Dot Diagram Worksheet
A Grade 12 Chemistry worksheet focusing on Lewis Dot Diagrams, formal charges, and resonance structures.
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Lewis Dot Diagram Worksheet
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Read each question carefully and provide detailed answers. Show all your work for calculations.
1. Draw the Lewis electron dot structure for the nitrate ion (NO₃⁻). Include all resonance structures and formal charges.
2. Draw the Lewis electron dot structure for sulfur dioxide (SO₂). Assign formal charges to each atom.
3. Which of the following molecules has a central atom that violates the octet rule?
CO₂
PCl₅
NH₃
H₂O
4. What is the formal charge on the nitrogen atom in the ammonium ion (NH₄⁺)?
-1
0
+1
+2
5. In a Lewis structure, a single dash represents a bond, which consists of electrons.
6. Atoms in the third period and below can sometimes expand their octet, meaning they can accommodate more than electrons in their valence shell.
7. Resonance structures are different possible arrangements of atoms within a molecule.
True
False
8. The sum of the formal charges in a neutral molecule must always equal zero.
True
False
9. Explain why formal charges are useful in predicting the most stable Lewis structure for a molecule or ion.
10. Discuss the concept of resonance and how it applies to molecules like ozone (O₃).