(Chem-1) Review Unit 6: VSEPR Theory & Polarity

Front

What is VSEPR Theory?

Back

VSEPR Theory (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

How do covalent bonds form?

Back

Covalent bonds form by sharing valence electrons between atoms.

Front

What is a lone pair in a molecule?

Back

A lone pair is a pair of valence electrons that are not shared with another atom and are located on the central atom.

Front

What is the molecular shape of PH3?

Back

The molecular shape of PH3 is trigonal pyramidal.

Front

What is the electron geometry of PH3?

Back

The electron geometry of PH3 is tetrahedral.

Front

What is the electron geometry of H2S?

Back

The electron geometry of H2S is tetrahedral.

Front

What does it mean for a molecule to be polar?

Back

A polar molecule has a net dipole moment due to the presence of polar bonds and an asymmetrical shape, resulting in a distribution of charge.

Front

What is the difference between polar and nonpolar covalent bonds?

Back

Polar covalent bonds occur when electrons are shared unequally between atoms, while nonpolar covalent bonds occur when electrons are shared equally.

Front

What is the significance of lone pairs in determining molecular shape?

Back

Lone pairs occupy space and can repel bonding pairs, affecting the overall geometry of the molecule.

Front

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

Back

The shape of a molecule with four bonding pairs and no lone pairs is tetrahedral.