Give the approximate values for the indicated bond angles in the following molecules: (c)

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Identify the central atom in the molecule.

Determine the electron domain geometry around the central atom using the VSEPR theory, which considers both bonding and non-bonding electron pairs.

Count the number of bonding pairs and lone pairs around the central atom to predict the molecular geometry.

Based on the molecular geometry, approximate the bond angles. For example, in a tetrahedral geometry, the bond angles are approximately 109.5 degrees.

Consider any deviations from ideal bond angles due to factors such as lone pairs or double bonds, which can affect the angles due to differences in electron pair repulsion.

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주요 개념

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Bond Angles

Bond angles are the angles formed between two adjacent bonds at a central atom in a molecule. They are crucial for understanding molecular geometry and are influenced by the arrangement of electron pairs around the central atom, which can be predicted using VSEPR (Valence Shell Electron Pair Repulsion) theory.

VSEPR Theory

VSEPR theory is a model used to predict the geometry of individual molecules based on the repulsion between electron pairs surrounding a central atom. According to this theory, electron pairs will arrange themselves to minimize repulsion, leading to specific bond angles characteristic of different molecular shapes, such as linear, trigonal planar, or tetrahedral.

Molecular Geometry

Molecular geometry refers to the three-dimensional arrangement of atoms within a molecule. It is determined by the number of bonding and non-bonding electron pairs around the central atom, which influences the bond angles. Understanding molecular geometry is essential for predicting the physical and chemical properties of substances.