Domanda del libro di testo
(b) An AB4 molecule has two lone pairs of electrons on the A atom (in addition to the four B atoms). What is the electron-domain geometry around the A atom?
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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 16a
a. Methane (CH4) and the perchlorate ion (ClO4−) are both described as tetrahedral. What does this indicate about their bond angles?
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Tetrahedral geometry is a common molecular shape in chemistry, characterized by four groups of electrons around a central atom.
In a tetrahedral geometry, the bond angles are determined by the repulsion between electron pairs, which is explained by the VSEPR (Valence Shell Electron Pair Repulsion) theory.
According to VSEPR theory, the electron pairs will arrange themselves as far apart as possible to minimize repulsion, resulting in a bond angle of approximately 109.5 degrees.
For methane (CH4), the central carbon atom is bonded to four hydrogen atoms, forming a perfect tetrahedral shape with bond angles of 109.5 degrees.
Similarly, in the perchlorate ion (ClO4−), the central chlorine atom is surrounded by four oxygen atoms, also forming a tetrahedral shape with bond angles of approximately 109.5 degrees.
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Tetrahedral Geometry
Tetrahedral geometry occurs when a central atom is bonded to four other atoms, resulting in a three-dimensional shape. In this arrangement, the bond angles are approximately 109.5 degrees, which minimizes electron pair repulsion according to VSEPR (Valence Shell Electron Pair Repulsion) theory. This geometry is characteristic of molecules like methane (CH4) and the perchlorate ion (ClO4−).
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04:44
Electron Geometry
Bond Angles
Bond angles are the angles formed between adjacent bonds in a molecule. In tetrahedral molecules, the ideal bond angle is about 109.5 degrees due to the spatial arrangement of the electron pairs around the central atom. Deviations from this angle can occur due to factors such as lone pairs or differences in electronegativity among bonded atoms.
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01:53Bond Angles
VSEPR Theory
VSEPR theory is a model used to predict the geometry of molecules based on the repulsion between electron pairs surrounding a central atom. It posits that electron pairs will arrange themselves to be as far apart as possible, leading to specific molecular shapes, such as tetrahedral for molecules with four bonding pairs. This theory helps explain the bond angles observed in molecules like CH4 and ClO4−.
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02:13Molecular Shapes and VSEPR
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