Unit 5: Wk12 Bonding, Lewis Structures,Names,VSEPR,Polarity

Front

What is a nonpolar molecule?

Back

A nonpolar molecule is a molecule that has an even distribution of electrical charge, resulting in no positive or negative poles. Example: CBr₄.

Front

What is a polar molecule?

Back

A polar molecule is a molecule that has a partial positive charge on one end and a partial negative charge on the other, due to an uneven distribution of electrons. Example: H₂S.

Front

What does VSEPR stand for?

Back

VSEPR stands for Valence Shell Electron Pair Repulsion, a theory used to predict the shape of molecules based on the repulsion between electron pairs.

Front

What is the main principle of VSEPR theory?

Back

The main principle of VSEPR theory is that molecules adjust their shapes to keep pairs of valence electrons as far apart as possible.

Front

Define electronegativity.

Back

Electronegativity is a measure of how well an atom can attract and hold onto electrons.

Front

What is the difference between polar and nonpolar bonds?

Back

Polar bonds occur when there is a significant difference in electronegativity between the two atoms, while nonpolar bonds occur when the electronegativity difference is negligible.

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.

Front

What is a dipole moment?

Back

A dipole moment is a measure of the separation of positive and negative charges in a molecule, indicating its polarity.

Front

How does molecular geometry affect polarity?

Back

Molecular geometry affects polarity by determining the distribution of charge; symmetrical shapes tend to be nonpolar, while asymmetrical shapes are often polar.

Front

What is the significance of lone pairs in VSEPR theory?

Back

Lone pairs occupy space and can affect the shape of the molecule by repelling bonding pairs, leading to different molecular geometries.