Ch.9 - Molecular Geometry and Bonding Theories

Brown - Chemistry: The Central Science 15th Edition

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Brown 15th Edition

Ch.9 - Molecular Geometry and Bonding Theories

Problem 11a3

Chapter 9, Problem 11a3

For each of these contour representations of molecular orbitals, identify (a) the atomic orbitals (s or p) used to construct the MO (iii)

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Observe the contour representations of the molecular orbitals labeled (i), (ii), and (iii).

Identify the shape and orientation of the orbitals in each representation.

For (i), note the combination of two different colored lobes, indicating a bonding molecular orbital formed from p orbitals.

For (ii), observe the four lobes with alternating colors, suggesting an antibonding molecular orbital formed from p orbitals.

For (iii), recognize the single, symmetrical shape around the nuclei, indicating a bonding molecular orbital formed from s orbitals.

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Key Concepts

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

Molecular Orbitals (MOs)

Molecular orbitals are formed by the linear combination of atomic orbitals (LCAO) from the constituent atoms in a molecule. They describe regions in a molecule where electrons are likely to be found and can be bonding, antibonding, or non-bonding. Understanding the shape and energy of these orbitals is crucial for predicting molecular behavior and reactivity.

Atomic Orbitals

Atomic orbitals are mathematical functions that describe the wave-like behavior of electrons in atoms. The most common types are s and p orbitals, where s orbitals are spherical and p orbitals are dumbbell-shaped. The combination of these orbitals leads to the formation of molecular orbitals, which are essential for understanding chemical bonding.

Contour Representation

Contour representations visually depict the shape and distribution of molecular orbitals. These diagrams illustrate regions of high electron density and help identify the contributions of atomic orbitals to the molecular orbitals. Analyzing these representations allows for the identification of the specific atomic orbitals involved in the formation of each molecular orbital.

Related Practice

Textbook Question

For each of these contour representations of molecular orbitals, identify (c) whether the MO is bonding or antibonding (i)

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Textbook Question

For each of these contour representations of molecular orbitals, identify (b) the type of MO (s or p) (iii)

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Textbook Question

For each of these contour representations of molecular orbitals, identify (a) the atomic orbitals (s or p) used to construct the MO (i)

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Textbook Question

The following is part of a molecular orbital energy-level diagram for MOs constructed from 1s atomic orbitals.

(a) What labels do we use for the two MOs shown?

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Textbook Question

The drawing below shows the overlap of two hybrid orbitals to form a bond in a hydrocarbon. (b) Which of the following could be the identity of the hydrocarbon: (i) CH4, (ii) C2H6, (iii) C2H4, or (iv) C2H2?

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Textbook Question

For each of these contour representations of molecular orbitals, identify (b) the type of MO (s or p) (i)

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