Back to AI Flashcard MakerChemistry /OCR A-Level Chemistry: Chapter 6 - Shapes of Molecules Part 1

OCR A-Level Chemistry: Chapter 6 - Shapes of Molecules Part 1

Chemistry20 CardsCreated 2 months ago

This deck contains 20 flashcards that cover the key concepts related to predicting molecular shape and bond angles based on electron pair repulsion theory.

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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TermDefinition
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
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.