QQuestionChemistry
QuestionChemistry
The electron geometry of a water molecule is tetrahedral even though the molecular geometry is bent.
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Answer
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Step 1:: Understand the problem
We need to explain why the electron geometry of a water molecule is tetrahedral even though the molecular geometry is bent. This requires understanding the difference between electron geometry and molecular geometry.
Step 2:: Differentiate electron geometry and molecular geometry
- Electron geometry refers to the three-dimensional shape of the electron cloud around an atom. It is determined by the number of electron pairs (both bonding and lone) in the valence shell. - Molecular geometry, on the other hand, refers to the three-dimensional shape of a molecule, taking into account only the arrangement of atoms.
Step 3:: Analyze the water molecule (H^2O)
- The central oxygen atom in a water molecule is bonded to two hydrogen atoms and has two lone pairs of electrons. - Therefore, there are four electron pairs around the central oxygen atom, resulting in a tetrahedral electron geometry.
Step 4:: Explain the tetrahedral electron geometry
- In a tetrahedral electron geometry, the electron pairs are arranged in such a way that they minimize repulsion between them. - This results in a tetrahedral arrangement where each electron pair is as far apart from the others as possible.
Step 5:: Analyze the molecular geometry of H^2O
- Although the electron geometry is tetrahedral, the molecular geometry is bent or V-shaped due to the presence of the two lone pairs of electrons on the central oxygen atom. - The lone pairs occupy more space than the bonding pairs, causing the bond angle between the hydrogen atoms to be less than the typical tetrahedral angle (109.5°).
Step 6:: Summarize the explanation
- Despite the bent molecular geometry, the electron geometry of a water molecule remains tetrahedral due to the arrangement of electron pairs around the central oxygen atom. - The lone pairs on the central atom cause the bond angle between the hydrogen atoms to be less than the ideal tetrahedral angle, resulting in the bent molecular geometry.
Final Answer
The electron geometry of a water molecule is tetrahedral due to the arrangement of electron pairs around the central oxygen atom. The molecular geometry is bent or V-shaped due to the presence of lone pairs on the central atom, which occupy more space and cause a decrease in the bond angle between the hydrogen atoms.
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