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Exam 9: Chemical Bonding I: Lewis Theory

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Question 1

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Choose the best Lewis structure for SeO₄^2-.

A)

B)

C)

D)

E)

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Question 2

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Which molecule or compound below contains a polar covalent bond?

A) C₂H₄
B) ZnS
C) LiI
D) NCl₃
E) AgCl

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D

Question 3

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Choose the bond below that is the weakest.

Give the number of valence electrons for SF₄.

Use the bond energies provided to estimate Δ_rH° for the reaction below. XeF_{2 +} 2F₂ → XeF₆ Δ_rH° = ? Bond $\quad$$\quad$ Bond Energy (kJ mol^-1) Xe-F $\quad$$\quad$$\quad$$\quad$ 147 F-F $\quad$$\quad$$\quad$$\quad$ 159

Choose the bond below that is least polar.

Choose the best Lewis structure for SO₄^2-.

Identify the compound or element with metallic bonding.

Choose the bond below that is the weakest.

Which of the following represent the Lewis structure for Ca²⁺?

Which of the following processes is exothermic?

The compound ClF contains

Using periodic trends,place the following bonds in order of increasing ionic character. Si-P $\quad$ Si-Cl $\quad$ Si-S

Identify the number of valence electrons for XeI₂.

The Lewis structure of BrO₃^- is as follows: What is the formal charge on Br atom?

Place the following elements in order of increasing electronegativity. Sr $\quad$ N $\quad$ Na

Draw the Lewis dot structure for Al³⁺.

Using Lewis structures and formal charge,which of the following ions is most stable? OCN^- $\quad$ ONC^- $\quad$ NOC^-

Use the data given below to construct a Born-Haber cycle to determine the second ionization energy of Ca. $\begin{array} { l c } & \Delta H ^ { \circ } \left( \mathrm { kJ } \mathrm { mol } ^ { - 1 } \right) \\\mathrm { Ca } ( s ) \rightarrow \mathrm { Ca } ( g ) & 193 \\\mathrm { Ca } ( g ) \rightarrow \mathrm { Ca } ^ { + } ( g ) + \mathrm { e } ^ { - } & 590 \\2 \mathrm { O } ( g ) \rightarrow \mathrm { O } _ { 2 } ( g ) & - 498 \\\mathrm { O } ( g ) + \mathrm { e } ^ { - } \rightarrow \mathrm { O } ^ { - } ( g ) & - 141 \\\mathrm { O } ^ { - } ( g ) + \mathrm { e } ^ { - } \rightarrow \mathrm { O } ^ { 2 - } ( g ) & 878 \\\mathrm { Ca } ( s ) + \frac { 1 } { 2 } \mathrm { O } _ { 2 } ( g ) \rightarrow \mathrm { CaO } ( s ) & - 635 \\\mathrm { Ca } ^ { 2 + } ( g ) + \mathrm { O } ^ { 2 - } ( g ) \rightarrow \mathrm { CaO } ( s ) & - 3414\end{array}$

Identify the substance that conducts electricity.