VSEPR Theory Quick

What is a key difference between a Lewis structure and the actual geometry of a molecule?

• Lewis structures always show the correct bond angles, while geometry does not.

• Lewis structures represent 2D arrangements, while geometry reflects the 3D shape.

• Lewis structures only show single bonds, while geometry includes double and triple bonds.

• Lewis structures indicate polarity, while geometry determines hybridization.

What is the primary purpose of VSEPR theory in chemistry?

• To determine the mass of a molecule.

• To predict the reactivity of elements.

• To explain why electrons have negative charges.

• To predict molecular shapes, properties, bond angles, and hybridizations.

When determining electron groups around a central atom, how are double and triple bonds counted?

• Each bond in a double or triple bond counts as a separate electron group.

• Double bonds count as two groups, triple bonds as three groups.

• Both double and triple bonds count as one electron group each.

• Double and triple bonds are not considered electron groups.

What is the approximate bond angle for a molecule with four electron groups around its central atom, assuming no lone pairs?

• 90 degrees

• 120 degrees

• 109.5 degrees

• 180 degrees