1st Year Molecular Geometries and Electron Domains

Based on our activity from a previous class, what does VSEPR stand for?

• Very Special Electron Pair Repulsion

• Valence Shell Electron Pair Repulsion

• Variable Shell Electron Pair Repulsion

• Valence Shell Electron Pair Rotation

Answer explanation

VSEPR stands for Valence Shell Electron Pair Repulsion, which was the concept discussed in the previous class.

How many electron domains are there in a molecule with linear molecular geometry?

• 2

• 3

• 4

• 5

Answer explanation

In a molecule with linear molecular geometry, there are 2 electron domains, so the correct answer is 2.

What is the shape of a molecule with three bonding pairs and no lone pairs of electrons?

• Linear

• Trigonal planar

• Tetrahedral

• Bent

Answer explanation

The shape of a molecule with three bonding pairs and no lone pairs of electrons is trigonal planar, as it has a flat, triangular shape with 120-degree bond angles.

How many electron domains are shown in this picture?

Mathematical Equivalence

ON

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°.

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.

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.

Tags

NGSS.HS-PS2-6

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.