Chapter 8 Test

The theory that states that covalent bonds are formed when orbitals of different atoms overlap is called the __ theory.

• valence bond
• VSEPR
• molecular orbital
• electron sea

What type of bond forms from orbitals overlapping end to end?

• pi
• sigma
• gamma
• delta

Which of the following bonds is the strongest?

• single
• double
• triple
• these are all equal in strength

How many sigma and pi bonds are there in a molecule of N₂?

• One sigma and two pi
• Two sigma and one pi
• One sigma and one pi
• One sigma and zero pi

For some molecules, no single Lewis structure can completely describe the distribution of electrons. The display of an intermediate character within the bonds of such molecules is called...

• antibonding
• resonance
• polarity
• hybridization

The assumption that molecular shapes are largely determined by the repulsion of regions of electron concentration is known as the ___ theory.

• valence bond
• VSEPR
• molecular orbital
• electron sea

What is the shape of a molecule that has four electron concentrations, only three of which are occupied by bonding pairs of electrons?

• tetrahedral
• bent
• pyramidal
• trigonal planar

Predict the shape of the molecule H₂CO.

• bent
• pyramidal
• tetrahedral
• trigonal planar

According to VSEPR theory, two-atom molecules are ___ linear.

• never
• sometimes
• usually
• always

According to VSEPR theory, three-atom molecules are ___ linear.

• never
• sometimes
• usually
• always