VSEPR Review

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 the electron pairs in the valence shell of the central atom.

Front

What molecular shape does a molecule with 4 shared pairs of electrons have?

Back

Tetrahedral.

Front

What is the molecular shape of water (H2O)?

Back

Bent.

Front

How many shared and unshared pairs of electrons does a linear molecule have?

Back

A linear molecule has 2 shared pairs and 0 unshared pairs.

Front

What is the molecular geometry of carbon dioxide (CO2)?

Back

Linear.

Front

What is the molecular shape of ammonia (NH3)?

Back

Trigonal pyramidal.

Front

What is the effect of lone pairs on molecular shape?

Back

Lone pairs repel more strongly than bonding pairs, which can alter the expected geometry.

Front

What is the molecular shape of a molecule with 2 shared pairs and 1 unshared pair?

Back

Trigonal planar.

Front

What is the molecular geometry of a molecule with 3 shared pairs and 1 unshared pair?

Back

Trigonal pyramidal.

Front

What is the bond angle in a tetrahedral molecule?

Back

Approximately 109.5 degrees.