U3 VSEPR Shapes - Zeph

Front

What is VSEPR theory?

Back

VSEPR (Valence Shell Electron Pair Repulsion) theory is a model used to predict the geometry of individual molecules based on the repulsion between electron pairs in the valence shell of the central atom.

Front

What shape does BH3 form?

Back

Trigonal Planar.

Front

Why is H2O bent?

Back

Because of left over electron pairs.

Front

What VSEPR structure is associated with three bonding pairs and one lone pair?

Back

Trigonal Pyramidal.

Front

What VSEPR structure is associated with four bonding pairs and no lone pairs?

Back

Tetrahedral.

Front

What VSEPR structure does water (H2O) form?

Back

Bent.

Front

What is the bond angle in a trigonal planar molecule?

Back

120 degrees.

Front

What is the bond angle in a tetrahedral molecule?

Back

109.5 degrees.

Front

What is a lone pair in VSEPR theory?

Back

A lone pair is a pair of valence electrons that are not shared with another atom and can affect molecular shape.

Front

How do lone pairs affect molecular geometry?

Back

Lone pairs take up more space than bonding pairs, which can compress bond angles between atoms.