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Ch.9 - Chemical Bonding I: The Lewis Model
Chapter 9, Problem 67

How important is the resonance structure shown here to the overall structure of carbon dioxide? Explain.
Resonance structure of carbon dioxide illustrating bond arrangements and electron distribution.

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Identify the resonance structure shown in the image. The structure depicts a molecule with a sulfur atom double-bonded to one oxygen atom and single-bonded to another oxygen atom, with lone pairs on the oxygen atoms.
Understand the concept of resonance. Resonance structures are different ways of drawing the same molecule, showing the delocalization of electrons within the molecule.
Analyze the resonance structure in the context of carbon dioxide (CO2). Carbon dioxide typically has two resonance structures where the carbon is double-bonded to each oxygen atom.
Compare the given structure to the typical resonance structures of CO2. The given structure is not a resonance structure of CO2 but rather a different molecule, likely sulfur dioxide (SO2).
Conclude that the resonance structure shown is not relevant to the overall structure of carbon dioxide, as it represents a different molecule.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Resonance Structures

Resonance structures are different Lewis structures for the same molecule that depict the same arrangement of atoms but differ in the distribution of electrons. They are used to represent delocalized electrons within certain molecules, indicating that the actual structure is a hybrid of these forms. In carbon dioxide, resonance structures help illustrate the equivalent bonding between carbon and oxygen atoms, contributing to the molecule's stability.
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Molecular Geometry

Molecular geometry refers to the three-dimensional arrangement of atoms in a molecule. In carbon dioxide, the linear geometry arises from the arrangement of the double bonds between carbon and oxygen, which minimizes electron pair repulsion according to VSEPR theory. Understanding the geometry is crucial for predicting the molecule's reactivity and interactions with other substances.
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Bond Order

Bond order is a measure of the number of chemical bonds between a pair of atoms, which influences the bond strength and stability. In carbon dioxide, the bond order is 2 for each C=O bond, indicating a double bond. This concept is essential for understanding the overall stability and reactivity of the molecule, as higher bond orders typically correlate with stronger, shorter bonds.
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