Back to AI Flashcard MakerChemistry /OCR A-Level Chemistry: Chapter 6 - Shapes of Molecules Part 1
What does molecular shape depend on?
Electron pairs around the central atom.
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Key Terms
Term
Definition
What does molecular shape depend on?
Electron pairs around the central atom.
In what way do electron pairs interact?
They repel each other.
Which type of pair repels the most?
Lone pairs
What is the order of pair repulsion, from strongest to weakest?
Lone pair/lone pair
Lone pair/bonding pair
Bonding pair/bonding pair
What is the name of the way to predict a molecule's shape?
Electron pair repulsion theory.
What shape name is given to a molecule with no lone pairs?
Tetrahedral
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| Term | Definition |
|---|---|
What does molecular shape depend on? | Electron pairs around the central atom. |
In what way do electron pairs interact? | They repel each other. |
Which type of pair repels the most? | Lone pairs |
What is the order of pair repulsion, from strongest to weakest? | Lone pair/lone pair |
What is the name of the way to predict a molecule's shape? | Electron pair repulsion theory. |
What shape name is given to a molecule with no lone pairs? | Tetrahedral |
What is the bond angle in a tetrahedral molecule? | 109.5 |
What shape name is given to a molecule with one lone pair? | Trigonal pyramidal |
What is the bond angle in a trigonal pyramidal molecule? | 107 |
What shape name is given to a molecule with two lone pairs? | Non-linear |
What is the bond angle in a non-linear molecule? | 104.5 |
What shape name is given to a molecule with 3 electron pairs around the central atom? | Linear |
What is the bond angle in a linear molecule? | 180 |
What shape name is given to a molecule with 3 electron pairs around the central atom? | Trigonal planar |
What is the bond angle in a trigonal planar molecule? | 120 |
What shape name is given to a molecule with 5 electron pairs around the central atom? | Trigonal bipyramidal |
What is the bond angle in a trigonal bipyramidal molecule? | There are actually two, 120 in one plane and 90 in the other plane. |
What shape name is given to a molecule with 6 electron pairs around the central atom? | Octahedral |
What is the bond angle in an octahedral molecule? | 90 |
What is electronegativity? | An atom's ability to attract the electron pair in a covalent bond. |