Molecular Shape - The Tetrahedron PDF
Document Details
Uploaded by FragrantSpessartine
University College Cork
Dr. J.J. Keating
Tags
Summary
This presentation details various molecular shapes, including linear, trigonal planar, bent, tetrahedral, and others. It explains concepts like bond angles and electron pair repulsion using examples like methane (CH4) and sulfur dioxide (SO2). The presentation is well-suited for an undergraduate-level chemistry course. Diagrams and molecular models are used to visually aid in understanding.
Full Transcript
Pharmaceutical Chemistry Molecular Shape: The Tetrahedron Dr. J.J. Keating 1 Molecular Shape Bond angle – In an A-B-C molecule, angle between A-B and B-C. H2O bond angle = 104.5° VSEPR – Valence Shell Electron Pair...
Pharmaceutical Chemistry Molecular Shape: The Tetrahedron Dr. J.J. Keating 1 Molecular Shape Bond angle – In an A-B-C molecule, angle between A-B and B-C. H2O bond angle = 104.5° VSEPR – Valence Shell Electron Pair Repulsion theory Electron pairs repel one another. Valence electron pairs of an atom (which include lone pairs and bonding pairs) take up positions as far from one another as possible. 2 Molecular Shape 3 Molecular Shape 4 Molecular Shape – AB2 (Linear) Cl Be Cl BeCl2 beryllium chloride H H C2H2 ethyne 5 Molecular Shape – AB3 (Trigonal Planar) F B F F BF3 boron trifluoride 6 Molecular Shape – AB3 (Trigonal Planar) OH B O F tavaborole 7 Molecular Shape – AB2E (Angular, Bent) + S O O SO2 sulfur dioxide 8 Molecular Shape – Trigonal Pyramid trigonal pyramid square pyramid Great Pyramid of Giza, Egypt 9 Molecular Shape – Trigonal Pyramid 10 Molecular Shape – AB4 (Tetrahedral) 11 Molecular Shape – AB4 (Tetrahedral) C 12 Molecular Shape – AB4 (Tetrahedral) C 13 Molecular Shape – AB4 (Tetrahedral) C 14 Molecular Shape – AB4 (Tetrahedral) C L R 15 Molecular Shape – AB4 (Tetrahedral) C 16 Molecular Shape – AB4 (Tetrahedral) C 17 Molecular Shape – AB4 (Tetrahedral) These bonds are on This is a dash bond. the plane of the slide, This means that this and are on the same bond is facing away plane as the C atom. from you and it begins with the C atom which C is in the plane of the slide. This is a wedge bond. This means that this bond is facing towards you and it begins with the C atom which is in the plane of the slide. 18 Molecular Shape – AB4 (Tetrahedral) CH4 methane molecular model 19
