VSEPR Theory: Predicting Molecular Shapes with Ease

The video tutorial explains how to predict molecular geometry using VSEPR theory. It outlines the steps involved, starting with drawing the Lewis structure, counting electron pairs, and determining the geometry based on electron pair arrangement. The tutorial uses water as an example, showing that while electron pairs are arranged tetrahedrally, the molecular geometry is bent due to the position of hydrogen atoms.

What is the first step in predicting molecular geometry using VSEPR theory?

• Determining the molecular shape

• Identifying the central atom

• Drawing the Lewis structure

• Counting the number of electron pairs

How many electron pairs are around the central oxygen atom in a water molecule?

• 2 bond pairs and 2 lone pairs

• 3 bond pairs and 1 lone pair

• 1 bond pair and 3 lone pairs

• 4 bond pairs

What is the electron pair geometry around the central atom in a water molecule?

• Linear

• Tetrahedral

• Octahedral

• Trigonal planar

Why is it incorrect to say that a water molecule has a tetrahedral shape?

• Because the molecular geometry is based on atom positions, not electron pairs

• Because the electron pairs are not arranged tetrahedrally

• Because it has no lone pairs

• Because it has more than four electron pairs

What is the molecular geometry of a water molecule?

• Linear

• Tetrahedral

• Trigonal planar

• Bent or angular