Geometry Angles

Which molecular geometry has four bonding pairs and no lone pairs of electrons?

• Linear

• Trigonal planar

• Tetrahedral

• Trigonal pyramidal

Answer explanation

The correct choice is tetrahedral because it has four bonding pairs and no lone pairs of electrons.

What is the angle between the bonding pairs in a tetrahedral molecule?

• 90°

• 109.5°

• 120°

• 180°

Answer explanation

The angle between the bonding pairs in a tetrahedral molecule is 109.5°, so the correct answer is 109.5°.

What molecular geometry does a molecule have if it has three bonding pairs and one lone pair of electrons?

• Linear

• Trigonal planar

• Tetrahedral

• Trigonal pyramidal

Answer explanation

A molecule with three bonding pairs and one lone pair of electrons has a trigonal pyramidal molecular geometry.

Which molecular geometry is formed by two bonding pairs and two lone pairs of electrons?

• Linear

• Trigonal planar

• Tetrahedral

• Bent

Answer explanation

The molecular geometry formed by two bonding pairs and two lone pairs of electrons is Bent.

What is the bond angle in a trigonal planar molecule?

• 90°

• 109.5°

• 120°

• 180°

Answer explanation

The bond angle in a trigonal planar molecule is 120°, which is the correct choice.

How does the presence of lone pairs affect the bond angles in a molecule?

• Increases the bond angles

• Decreases the bond angles

• Does not affect the bond angles

• Randomly affects the bond angles

Answer explanation

The presence of lone pairs decreases the bond angles in a molecule due to increased repulsion between the lone pairs and bonding pairs.

How many electron domains are shown in this picture?

Mathematical Equivalence

ON

In VSEPR theory, what do lone pairs of electrons do to the shape of a molecule?

• They do not affect the shape.

• They make the molecule larger.

• They push bonding pairs closer together.

• They pull bonding pairs further apart.

Answer explanation

Lone pairs of electrons push bonding pairs closer together, affecting the shape of the molecule in VSEPR theory.

Which of the following is NOT a factor that VSEPR theory considers to predict the shape of a molecule?

• The number of lone pairs on the central atom

• The number of bonding pairs on the central atom

• The weight of the atoms in the molecule

• The repulsion between electron pairs

Answer explanation

VSEPR theory does not consider the weight of the atoms in the molecule when predicting the shape of a molecule.

In a trigonal pyramidal molecule, how many bonding pairs and lone pairs are there?

• 3 bonding pairs, 1 lone pair

• 2 bonding pairs, 2 lone pairs

• 4 bonding pairs, 0 lone pairs

• 3 bonding pairs, 0 lone pairs

Answer explanation

In a trigonal pyramidal molecule, there are 3 bonding pairs and 1 lone pair, so the correct answer is 3 bonding pairs, 1 lone pair.