Domanda del libro di testo
For each of these contour representations of molecular orbitals, identify (b) the type of MO (s or p) (iii)
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Ch.9 - Molecular Geometry and Bonding Theories
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement146
- Ch.2 - Atoms, Molecules, and Ions200
- Ch.3 - Chemical Reactions and Reaction Stoichiometry176
- Ch.4 - Reactions in Aqueous Solution155
- Ch.5 - Thermochemistry126
- Ch.6 - Electronic Structure of Atoms131
- Ch.7 - Periodic Properties of the Elements126
- Ch.8 - Basic Concepts of Chemical Bonding123
- Ch.9 - Molecular Geometry and Bonding Theories143
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces91
- Ch.12 - Solids and Modern Materials122
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics174
- Ch.15 - Chemical Equilibrium101
- Ch.16 - Acid-Base Equilibria139
- Ch.17 - Additional Aspects of Aqueous Equilibria146
- Ch.18 - Chemistry of the Environment72
- Ch.19 - Chemical Thermodynamics129
- Ch.20 - Electrochemistry142
- Ch.21 - Nuclear Chemistry101
- Ch.22 - Chemistry of the Nonmetals68
- Ch.23 - Transition Metals and Coordination Chemistry66
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry10
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Non è quello che usi tu?Cambia libro di testo
Capitolo 9, Problema 10a
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?
Guida verificata passo dopo passo1
Identify the atomic orbitals involved in the formation of molecular orbitals. In this case, the diagram shows molecular orbitals formed from 1s atomic orbitals.
Recognize that the two molecular orbitals formed from 1s atomic orbitals are the bonding and antibonding molecular orbitals.
Label the lower energy molecular orbital as the bonding molecular orbital, denoted as σ(1s).
Label the higher energy molecular orbital as the antibonding molecular orbital, denoted as σ*(1s).
Note that the bonding molecular orbital (σ(1s)) is lower in energy and more stable, while the antibonding molecular orbital (σ*(1s)) is higher in energy and less stable.
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Molecular Orbitals (MOs)
Molecular orbitals are formed by the linear combination of atomic orbitals (LCAO) when atoms bond. In the case of diatomic molecules, the 1s atomic orbitals from each atom combine to create two types of molecular orbitals: bonding and antibonding. The bonding molecular orbital is lower in energy and stabilizes the molecule, while the antibonding molecular orbital is higher in energy and can destabilize it.
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03:06
Molecular Orbital Theory
Bonding and Antibonding Orbitals
Bonding orbitals are formed when atomic orbitals combine constructively, leading to increased electron density between the nuclei, which stabilizes the molecule. Antibonding orbitals, on the other hand, result from destructive interference, creating a node between the nuclei and leading to decreased electron density in that region, which can destabilize the molecule. The labels for these orbitals are typically denoted as σ (sigma) for bonding and σ* (sigma star) for antibonding.
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03:06Molecular Orbital Theory
Energy-Level Diagrams
Energy-level diagrams visually represent the relative energies of molecular orbitals. In these diagrams, bonding orbitals are placed lower in energy than their corresponding antibonding orbitals. The arrangement helps predict the stability of the molecule based on the number of electrons in each type of orbital, guiding the understanding of molecular structure and reactivity.
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01:57Energy Diagrams
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Domanda del libro di testo
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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Domanda del libro di testo
For each of these contour representations of molecular orbitals, identify (a) the atomic orbitals (s or p) used to construct the MO (i)
551
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Domanda del libro di testo
The drawing below shows the overlap of two hybrid orbitals to form a bond in a hydrocarbon. (a) Which of the following types of bonds is being formed: (i) C¬C s, (ii) C¬C p, or (iii) C¬H s?
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Domanda del libro di testo
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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Domanda del libro di testo
The molecule shown here is called furan. It is represented in the typical shorthand way for organic molecules, with hydrogen atoms not shown, and each of the four vertices representing a carbon atom. e. The bond angles in furan are much smaller than those in benzene. The likely reason is which of the following? i. The hybridization of the carbon atoms in furan is different from that in benzene. ii. Furan does not have another resonance structure equivalent to the one shown here. iii. The atoms are forced to adopt smaller angles in a five-membered ring than in a six-membered ring. [Section 9.5]