Question 1

Which of the following best explains what determines the shape of a molecule according to VSEPR theory?

Accepted Answer

The arrangement of electron domains around the central atom

Question 2

What does VSEPR stand for?

Accepted Answer

Valence Shell Electron Pair Repulsion

Question 3

According to VSEPR theory, which of the following is NOT a main molecular shape?

Accepted Answer

Hexagonal

Question 4

Which statement correctly distinguishes a bonding pair from a nonbonding pair of electrons?

Accepted Answer

Bonding pairs are shared between atoms, while nonbonding pairs are localized on one atom

Question 5

What is the general rule for how electron domains will arrange themselves in a molecule?

Accepted Answer

Electron domains arrange themselves to minimize repulsion

Question 6

Which of the following best describes the difference between electron geometry and molecular geometry?

Accepted Answer

Electron geometry considers both bonding and nonbonding pairs, while molecular geometry considers only the arrangement of atoms

Question 7

Which statement about valence bond theory is correct?

Accepted Answer

Valence bond theory describes bonding as the overlap of atomic orbitals to form covalent bonds

Question 8

What is meant by 'hybrid orbitals' in chemistry?

Accepted Answer

Orbitals that result from the mixing of atomic orbitals on the same atom to form new equivalent orbitals

Question 9

Which of the following is NOT a type of hybridization discussed in general chemistry?

Accepted Answer

$$sp^4$$

Question 10

Which of the following best describes a sigma ($$\sigma) $$bond?

Accepted Answer

A bond formed by the end-to-end overlap of orbitals along the internuclear axis

Question 11

Which statement correctly describes a pi ($$\pi) $$bond?

Accepted Answer

A bond formed by the side-to-side overlap of p orbitals above and below the internuclear axis

Question 12

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in a double bond?

Accepted Answer

1 sigma and 1 pi

Question 13

Which of the following best describes electron delocalization?

Accepted Answer

Electrons are spread over several atoms, contributing to resonance and stability

Question 14

Which statement about molecular orbital theory is correct?

Accepted Answer

Molecular orbital theory describes electrons as occupying orbitals that extend over the entire molecule

Question 15

What are the two types of molecular orbitals and how do they differ?

Accepted Answer

Bonding orbitals have lower energy and increase stability, while antibonding orbitals have higher energy and decrease stability

Question 16

Which of the following is a correct way to determine if a compound is paramagnetic using molecular orbital theory?

Accepted Answer

If there are unpaired electrons in molecular orbitals, the compound is paramagnetic

Question 17

Which molecule would you expect to be diamagnetic based on its molecular orbital diagram?

Accepted Answer

$$N_2$$

Question 18

A molecule has a central atom with three bonding pairs and one lone pair. What is its electron geometry and molecular geometry?

Accepted Answer

Electron geometry: tetrahedral; Molecular geometry: trigonal pyramidal

Question 19

Which hybridization is expected for the central atom in $$CO_2$$?

Accepted Answer

$$sp$$

Question 20

Which of the following molecules contains both sigma and pi bonds?

Accepted Answer

$$O_2$$

Molecular Geometry and Bonding Theories (Chapter 9) – Guided Study Notes

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