Question 1

Which of the following bonds is expected to be the shortest?

Accepted Answer

$$\mathrm{N \equiv N}$$

Question 2

Place the following in order of increasing bond length: $$\mathrm{NO^+}$$, $$\mathrm{NO}$$, $$\mathrm{NO^-}.$$

Accepted Answer

$$\mathrm{NO^+} \u003c \mathrm{NO} \u003c \mathrm{NO^-}$$

Question 3

Which of the following best defines electronegativity?

Accepted Answer

The ability of an atom to attract electrons to itself in a chemical bond

Question 4

Using periodic trends, place the following bonds in order of increasing ionic character: $$\mathrm{Si-S}$$, $$\mathrm{Si-Cl}$$, $$\mathrm{Si-F}.$$

Accepted Answer

$$\mathrm{Si-S} \u003c \mathrm{Si-Cl} \u003c \mathrm{Si-F}$$

Question 5

Which of the following elements has the highest electronegativity?

Accepted Answer

F

Question 6

Place the following in order of decreasing first ionization energy: Cs, Mg, Ar.

Accepted Answer

Ar \u003e Mg \u003e Cs

Question 7

Which of the following atoms has the largest atomic radius?

Accepted Answer

Rb

Question 8

Which of the following correctly represents the second ionization of calcium?

Accepted Answer

$$\mathrm{Ca^+ (g) \rightarrow Ca$$^{2+}$$ (g) + e^-}$$

Question 9

Which of the following ionic compounds would have the most exothermic (largest negative) lattice energy?

Accepted Answer

$$\mathrm{MgO}$$

Question 10

Estimate $$\Delta H_{rxn}$$ for the reaction: $$\mathrm{C_2H_4 (g) + Cl_2$ (g) \rightarrow C_2H_4Cl_2 (g)}$$ using the following bond energies: $$\mathrm{C=C: 614\ kJ/mol}$$, $$\mathrm{C-C: 347\ kJ/mol}$$, $$\mathrm{Cl-Cl: 242\ kJ/mol}$$, $$\mathrm{C-Cl: 328\ kJ/mol}.$$

Accepted Answer

$$-328\ \mathrm{kJ}$$

Question 11

Which of the following molecules has a central atom that can have an expanded octet?

Accepted Answer

$$\mathrm{SF_6$}$$

Question 12

What is the molecular geometry of $$\mathrm{H_2O}$$ according to VSEPR theory?

Accepted Answer

Bent

Question 13

Which of the following best describes the polarity of $$\mathrm{$$CCl_4$$}$$?

Accepted Answer

Nonpolar covalent bonds, nonpolar molecule

Question 14

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in $$\mathrm{C_2H_2} ($$ethyne)?

Accepted Answer

3 $$\sigma$$, 2 $$\pi$$

Question 15

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

Accepted Answer

Side-by-side overlap of p orbitals

Question 16

Which of the following molecules can exhibit cis-trans isomerism?

Accepted Answer

$$\mathrm{CHCl=CHCl}$$

Question 17

Which of the following best explains why $$\mathrm{H_2O}$$ has a bent molecular geometry?

Accepted Answer

The two lone pairs on oxygen repel the bonding pairs, resulting in a bent shape

Question 18

Which of the following statements about lattice energy is correct?

Accepted Answer

Lattice energy increases with increasing charge and decreasing ionic radius

Question 19

Which of the following best describes the hybridization of the central atom in $$\mathrm{BF_3$}$$?

Accepted Answer

$$sp^2$$

Question 20

Which of the following molecules is polar?

Accepted Answer

$$\mathrm{SF_4$}$$

General Chemistry I: Exam 4 Review Study Guide – Bonding, Structure, and Periodic Trends

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