VSEPR Theory & Molecular Shapes Test Review

What does VSEPR stand for?

• Valence Shell Electron Pair Repulsion

• Valence Shell Electron Pair Rotation

• Variable Shell Electron Pair Repulsion

• Valence Shell Energy Pair Repulsion

What is the main idea of VSEPR theory?

• Electron pairs attract each other to form bonds.

• Electron pairs repel each other and arrange themselves as far apart as possible to minimize repulsion.

• Electron pairs remain stationary around the central atom.

• Electron pairs form a linear structure around the central atom.

Which step is NOT part of determining molecular shape using VSEPR theory?

• Draw the Lewis structure of the molecule.

• Count the number of atoms bonded to the central atom.

• Count the number of lone (unshared) pairs on the central atom.

• Measure the bond angle directly using a protractor.

How many electron domains are present in a linear molecule like CO₂?

• 1

• 2

• 3

• 4

What is thegeometric shape of the molecule BF₃?

• Bent

• Linear

• Trigonal planar

• Trigonal pyramid

How many electron domain are in the molecule BF₃?

• 1

• 3

• 2

• 4

Which molecular shape corresponds to CH₄?

• Trigonal planar

• Tetrahedral

• Trigonal pyramidal

• Bent (V-shaped)

How many bonding pairs and lone pairs are present in NH₃?

• 4 bonding pairs, 0 lone pairs

• 3 bonding pairs, 1 lone pair

• 2 bonding pairs, 2 lone pairs

• 4 bonding pairs, 2 lone pairs

What is the polarity in a molecule like H₂O?

• the covalent bond are non polar

• the covalent bonds are ionic

• the covalent bonds are polar

• there are no covalent bonds i. water molecule

What determines whether a molecule is polar or nonpolar?

• The number of atoms in the molecule

• The symmetry of the molecule and whether bond dipoles cancel

• The molecular weight of the molecule

• The number of lone pairs in the molecule