Understanding Molecular Shapes of Larger Molecules

What is the first step in determining the molecular shape of a larger molecule like acetic acid?

• Counting electron groups

• Measuring bond angles

• Drawing the Lewis structure

• Identifying the central atoms

In the context of molecular shapes, what defines a central atom?

• An atom with two or more atoms bonded to it

• An atom with a single bond

• An atom with a double bond

• An atom with no lone pairs

How many central atoms are present in acetic acid?

• Three

• Two

• Four

• One

What is the shape of the first central atom in acetic acid according to VSEPR theory?

• Tetrahedral

• Trigonal planar

• Bent

• Linear

Which shape is associated with a central atom having three electron groups?

• Tetrahedral

• Trigonal planar

• Linear

• Bent

What is the molecular geometry of the oxygen atom with four electron groups, including two lone pairs?

• Trigonal planar

• Bent

• Tetrahedral

• Linear

What is the approximate bond angle for a tetrahedral shape?

• 120°

• 109.5°

• 180°

• 90°

How do lone pairs affect bond angles in a molecule?

• They increase the bond angle

• They decrease the bond angle

• They have no effect

• They make the bond angle exactly 90°

What is the bond angle associated with a trigonal planar shape?

• 90°

• 180°

• 109.5°

• 120°

Why might bond angles in acetic acid deviate from their ideal values?

• Because of the molecule's size

• Because of the molecule's symmetry

• Due to the absence of central atoms

• Due to the presence of lone pairs