Question

what states that the repulsion between valence - level electron pairs surrounding the central atom in a molecule causes them to be as far apart as possible?
molecular geometry
lewis structure
vsepr theory
electron dot notation
15 choose the best answer.
when dissolved in water, a(n) ____ forms a solution that can conduct an electric current.
an atom
a molecule
an electrolyte
a crystal

Explanation:

Question 1 (First Multiple - Choice Question)

• Molecular geometry is the three - dimensional arrangement of atoms in a molecule, not the theory about electron pair repulsion.
• Lewis structure is a way to represent the valence electrons of atoms in a molecule, mainly showing bonding and non - bonding electrons, not related to electron pair repulsion for molecular shape.
• VSEPR (Valence - Shell Electron - Pair Repulsion) theory states that the repulsion between valence - level electron pairs around the central atom in a molecule makes them be as far apart as possible, which is used to predict molecular geometries.
• Electron dot notation is a way to represent the valence electrons of an atom, not about molecular shape determination.

• An atom dissolved in water does not dissociate to form ions that can conduct electricity (except for some cases like metal atoms, but generally, a single atom in water doesn't conduct electricity).
• A molecule, if it is a non - electrolyte (like sugar), when dissolved in water, does not form ions and cannot conduct electricity.
• An electrolyte, when dissolved in water, dissociates into ions (positive and negative ions) which are free to move and can conduct an electric current.
• A crystal is a solid structure, and when dissolved in water (if it is soluble), the relevant part is the ions it produces, but the crystal itself is not the entity that conducts electricity in solution.

Answer:

C. VSEPR theory

Question 2 (Second Multiple - Choice Question)