Self Assessment_CH09_Polarity of Molecules

Which of the following formulas represents a polar molecule?

• H₂

• NI₃

• CO₂

• CCl₄

Which formula represents a nonpolar molecule?

• HBr
• H₂S
• CBr₄
• PCl₃

A molecule that has a partial positive end and a partial negative end because of unequal sharing of electrons is a _______________.

• nonpolar molecule

• polar molecule

• ionic compound

• metalic compound

Polar molecules have

• no charges.

• slight positive and negative charges on opposite ends of the molecules.

• only positive charges.

• either positive or negative charges, but not both.

In this Lewis structure, the symbol above F means...

• electrons are being transferred to Fluorine
• electrons are less attracted to F than H
• electrons are more attracted to F than H
• Fluorine has formed a cation

What is a characteristic of polar molecules?

• Symmetrical electron distribution.

• Asymmetrical electron distribution.

• Made up entirely of the same element.

• No electronegativity.

What happens to the outer electrons in a polar molecule?

• They spend more time around the less electronegative element

• They spend more time around the more electronegative element

• They are evenly distributed

• They are not affected

What does the arrow in a polar molecule diagram represent?

• The direction of electron flow

• The direction of the dipole moment

• The direction of the magnetic field

• The direction of the gravitational force

Why is the molecule nonpolar?

• There are nonbonding pairs on the central atom.

• There are different types of elements bonded to the central atom.

• There are no nonbonding pairs on the central atom and all of the atoms bonded to the central atom are the same.

Why is the molecule polar?

• There is a nonbonding pair on the central atom.

• There are different types of elements bonded to the central atom.

• There are no nonbonding pairs on the central atom and all of the atoms bonded to the central atom are the same.