Unit 6 Formative VSEPR

Which of the following statements BEST describes the central principle of Valence Shell Electron Pair Repulsion (VSEPR) theory?

• Electron groups around a central atom repel each other, leading to specific molecular shapes.
• The number of valence electrons determines the types of bonds an atom can form.
• Electrons in a molecule are delocalized, creating resonance structures.
• Atoms bond together to achieve a full outer shell of electrons.

In the context of VSEPR theory, what are "electron groups"?

• Only lone pairs of electrons.
• Bonds between atoms and lone pairs of electrons.
• Electrons that are shared between atoms only.
• Electrons that are free and not involved in bonding.

Which of the following best illustrates the concept of electron repulsion in VSEPR theory?

• Electron groups arranging themselves to minimize repulsion.
• Electrons moving freely within a molecule.
• Atoms forming bonds to achieve stability.
• Electrons creating resonance structures.

What shape does carbon dioxide (CO₂) take according to VSEPR theory?

• Bent
• Trigonal planar
• Tetrahedral
• Linear

If a molecule has four bonded electron groups, what molecular shape is likely to result?

• Bent
• Tetrahedral
• Trigonal planar
• Linear

How does the presence of lone pairs affect the shape of water (H₂O)?

• It makes the shape linear.
• It creates a trigonal planar shape.
• It has no effect on the shape.
• It results in a bent shape.

What is the significance of VSEPR theory in chemistry?

• It determines the types of bonds that can form between atoms.
• It describes the energy levels of electrons in an atom.
• It predicts the geometry of molecules based on electron group repulsion.
• It explains the chemical reactions of molecules.