Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:### Problem 3: Molecular Geometry and Bond Angles in Glycine
**Task**: Predict the molecular geometries and bond angles around the atoms designated with an arrow in glycine, an amino acid.
**Diagram Explanation**:
- The structure shown is of the glycine molecule, an amino acid.
- Each arrow (A, B, C, D) points to specific atoms in the molecule.
**Arrow Designations**:
- **A**: Points to the nitrogen atom (N) bonded to two hydrogen atoms (H) and one carbon atom (C).
- **B**: Points to a carbon atom (C) bonded to one hydrogen atom (H), the amino nitrogen (N), and a central carbon atom (C).
- **C**: Points to the central carbon atom (C) of the carboxylic acid group bonded to another carbon, oxygen, and hydroxyl (OH) group.
- **D**: Points to the oxygen atom (O) in the hydroxyl group (OH).
**Molecular Geometries and Bond Angles**:
- **A (Nitrogen atom)**:
- **Geometry**: Trigonal pyramidal
- **Bond Angles**: Approximately 107°
- **B (Carbon atom bonded to nitrogen)**:
- **Geometry**: Tetrahedral
- **Bond Angles**: Approximately 109.5°
- **C (Central carbon atom of the carboxylic group)**:
- **Geometry**: Trigonal planar
- **Bond Angles**: Approximately 120°
- **D (Oxygen atom of the hydroxyl group)**:
- **Geometry**: Bent
- **Bond Angles**: Approximately 104.5°
This structural understanding is critical for recognizing how amino acids interact and form proteins, impacting their biological functions.
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