Question 1

Which of the following Lewis symbols correctly represents the Sn$$^{2+}$$ ion?

Accepted Answer

Sn with no dots around the symbol

Question 2

When magnesium reacts with oxygen to form MgO, how many electrons are transferred in total, and which atom loses electrons?

Accepted Answer

Two electrons are transferred; magnesium loses electrons.

Question 3

Arrange the following ionic compounds in order of increasing lattice energy: KI, LiBr, MgS, GaN.

Accepted Answer

KI \u003c LiBr \u003c MgS \u003c GaN

Question 4

Which of the following bonds is polar, and which atom is more electronegative in that bond?

Accepted Answer

B—F; F is more electronegative.

Question 5

What is the formal charge on the central oxygen atom in ozone ($$\mathrm{O_3$}) $$according to its most stable Lewis structure?

Accepted Answer

$$+1$$

Question 6

Which of the following molecules has a trigonal planar molecular geometry?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 7

A molecule has four electron domains around its central atom, two of which are lone pairs. What is the molecular geometry of this molecule?

Accepted Answer

Bent

Question 8

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

$$\mathrm{SO_3$}$$

Question 9

What is the hybridization of the central atom in $$\mathrm{CS_2$}$$?

Accepted Answer

$$sp$$

Question 10

Which statement about $$\sigma$$ and $$\pi$$ bonds is correct?

Accepted Answer

A $$\sigma$$ bond is generally stronger than a $$\pi$$ bond.

Question 11

Which of the following sets contains the most electronegative element?

Accepted Answer

C in Be, B, C, Si

Question 12

A molecule with the formula $$\mathrm{AB_6$}$$ and no lone pairs on the central atom will have which molecular geometry?

Accepted Answer

Octahedral

Question 13

Which of the following best describes the difference between atomic orbitals and hybrid orbitals?

Accepted Answer

Atomic orbitals are found in isolated atoms, while hybrid orbitals are formed by mixing atomic orbitals in bonded atoms.

Question 14

Which of the following molecules or ions has a linear molecular geometry?

Accepted Answer

$$\mathrm{HCN}$$

Question 15

Which of the following best explains why $$\mathrm{BF_3$} is $$nonpolar?

Accepted Answer

The molecule is planar and the bond dipoles cancel due to its trigonal planar geometry.

Question 16

What is the bond angle in a molecule with a tetrahedral electron-domain geometry?

Accepted Answer

$$109.5^\circ$$

Question 17

Which of the following molecules is expected to have a dipole moment?

Accepted Answer

$$\mathrm{BF_2Cl}$$

Question 18

Which of the following best describes the formation of an $$sp^2$$ hybrid orbital?

Accepted Answer

It is formed by mixing one s and two p orbitals on the same atom.

Question 19

Which of the following statements about lattice energy is correct?

Accepted Answer

Lattice energy increases as the charges of the ions increase and as the sizes of the ions decrease.

Question 20

A molecule has five bonding domains and one nonbonding domain around its central atom. What is its molecular geometry?

Accepted Answer

Square pyramidal

Study Guide: Chemical Bonding and Molecular Geometry (Chapters 8 & 9)

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