Molecular Geometry (VSPER)

Front

What is the bond angle in H₂S?

Back

109.5 degrees

Front

Define a lone pair.

Back

A pair of non-bonding electrons.

Front

What is the shape of a molecule with four bonding pairs and no lone pairs?

Back

Tetrahedral.

Front

How do regions of electron density around a central atom arrange themselves?

Back

For maximum separation and to minimize repulsions.

Front

In covalent bonds, how are electrons treated?

Back

Electrons are shared.

Front

What is VSEPR theory?

Back

Valence Shell Electron Pair Repulsion theory; it predicts the geometry of molecules based on electron pair repulsion.

Front

What shape does a molecule with two bonding pairs and two lone pairs have?

Back

Bent.

Front

What is the bond angle in a trigonal planar molecule?

Back

120 degrees.

Front

What is the molecular shape of NH₃ (ammonia)?

Back

Trigonal pyramidal.

Front

What is the effect of lone pairs on bond angles?

Back

Lone pairs repel more strongly than bonding pairs, reducing bond angles.