Shapes of Molecules and Ions (OCR A-Level Chemistry A): Flashcards

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Shapes of Molecules and Ions
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VSEPR theory key principle

Electron pairs arrange as far apart as possible

Repulsion order: weakest to strongest

Bonded-bonded < bonded-lone < lone-lone

Lone pair effect on bond angle

Reduces by ~2.5° per lone pair

CH4\text{CH}_4 shape and angle

Tetrahedral, 109.5°

NH3\text{NH}_3 shape and angle

Pyramidal, 107°

H2O\text{H}_2\text{O} shape and angle

Bent/non-linear, 104.5°

2 electron pairs shape/angle

Linear, 180°

3 electron pairs shape/angle

Trigonal planar, 120°

6 electron pairs shape/angle

Octahedral, 90°

How to count double/triple bonds in VSEPR

As one bonding region

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Atoms, Ions and Compounds

Amount of Substance

Acids and Redox

Electrons and Bonding

Shapes of Molecules and Intermolecular Forces

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Amount of Substance

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Atoms, Ions and Compounds

Amount of Substance

Acids and Redox

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Shapes of Molecules and Intermolecular Forces

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Atoms, Ions and Compounds

Amount of Substance

Acids and Redox

Electrons and Bonding

Shapes of Molecules and Intermolecular Forces

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