Practice Problems Unit 4 Lesson 2

Front

What is a Lewis Structure?

Back

A Lewis Structure is a diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.

Front

What does polarity refer to in chemistry?

Back

Polarity refers to the distribution of electrical charge over the atoms joined by the bond. A polar bond occurs when there is a difference in electronegativity between the bonded atoms.

Front

What is the difference between polar and nonpolar molecules?

Back

Polar molecules have a net dipole moment due to the presence of polar bonds, while nonpolar molecules do not have a net dipole moment, often due to symmetrical arrangements.

Front

How do you determine the molecular geometry of a molecule?

Back

Molecular geometry can be determined using the VSEPR (Valence Shell Electron Pair Repulsion) theory, which states that electron pairs around a central atom will arrange themselves to minimize repulsion.

Front

What is the molecular geometry of BrF3?

Back

The molecular geometry of BrF3 is trigonal bipyramidal.

Front

What is the molecular geometry of PCl5?

Back

The molecular geometry of PCl5 is trigonal bipyramidal.

Front

What is a bonding pair of electrons?

Back

A bonding pair of electrons refers to a pair of electrons that are shared between two atoms, forming a covalent bond.

Front

What is the significance of lone pairs in Lewis Structures?

Back

Lone pairs are pairs of valence electrons that are not shared with another atom and can affect the molecular geometry and polarity of the molecule.

Front

What is the predicted molecular geometry of BrF5?

Back

The predicted molecular geometry of BrF5 is square pyramidal.

Front

What is the role of electronegativity in determining bond polarity?

Back

Electronegativity is a measure of an atom's ability to attract shared electrons. A significant difference in electronegativity between two atoms leads to the formation of polar bonds.