H.W. #15 Unit 6

The VSEPR theory is based on

• the minimization of repulsion among valence electron pairs.

• the neutralization of ionic charge in a molecule.

• the arrangement of inner electrons in a molecule.

• the loss and gain of electrons based on electronegativity.

Use VSEPR theory to predict the molecular geometry of the molecule whose Lewis structure is given as : F - S - F :

• bent or angular correct

• linear

• tetrahedral

• trigonal-pyramidal

• trigonal-planar

Answer explanation

There are two lone pairs on the central atom.

Predict the bond angle at the central atom of the hydronium ion (H₃O⁺).

• slightly less than 109.5°

• slightly less than 120°

• 90°

• 60°

• 180°

The electron geometry of NH₃ (ammonia) is

• linear.

• tetrahedral.

• bent.

• trigonal planar.

Answer explanation

There is one lone pair on the central atom.

What is the molecular geometry of Cl₂?

• linear

• trigonal planar

• tetrahedral

• trigonal bipyramidal

• octahedral

Answer explanation

14 total electrons in the structure with a single bond between both of the chlorine atoms.

What is the shape of AsF₃?

• T-shaped

• trigonal planar

• trigonal pyramidal

• tetrahedral

• seesaw

Answer explanation

There is one lone pair on the central atom.

The electron arrangement is (a)   and the molecular shape is (b)   .

• trigonal planar

• tetrahedral

• trigonal bipyramidal

• T-shaped

• trigonal planar

Answer explanation

Boron can have an incomplete octet.

A certain molecule has a central atom with 2 singly bonded atoms and 2 doubly bonded atoms. Which of the following is a possible molecular geometry?

• square planar

• tetrahedral

• see-saw

• trigonal bipyramidal

• linear

Answer explanation

This is an example of an atom that CAN have an EXPANDED octet.

Consider the molecule BF3. What is the geometry of the BF₃ molecule?

• Linear

• Trigonal planar

• Tetrahedral

• Bent

Which would most likely be polar?

• I and II only

• II and IV only correct

• II only

• I and III only

• I only