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Exam 9: The Basics of Chemical Bonding

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Question 81

Multiple Choice

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Draw the Lewis structure for HClO₂ from the skeletal structure presented below. If the valence shells are filled to the usual limit (a maximum of 8) , how many nonbonding valence electrons are in the molecule?

A) 14
B) 16
C) 18
D) 20
E) 26

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Question 82

Multiple Choice

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Draw a Lewis structure for H₃C-NH₂. Based on this Lewis structure, the calculated value for the formal charge on the nitrogen atom is Hint: Do not forget about double or triple bonds potentially being in the Lewis structure.

A) 2-.
B) 3+.
C) 3-.
D) 2+.
E) 0.

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Question 83

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There are five lone pairs of electrons in the acetate ion, CH₃COO^-.

The metaphosphate ion, PO₃^-, is the structural analog of the NO₃^- ion with respect to the arrangement of the atoms in the ion. After drawing the "best"Lewis structure for the metaphosphate ion based on formal charge considerations, what is the number of resonance structures for this "best"Lewis structure? Hint: Use formal charge to help determine how many realistic resonance structures there are for the metaphosphate ion.

When the fluoride ion reacts with a BF₃ molecule (a molecule in which there are no multiple bonds) , an ion is formed in which the boron atom is the central atom. The bond between the boron trifluoride and the fluoride ion is

The total number of valence electrons used in the C₄H₁₀ molecule is ________ so there is a total of ________ covalent bonds in this hydrocarbon molecule ________.

Based on the $\Delta$ H°_f data given, which compound is the most stable?

What is the electron configuration of the metal ion in Cr₂(SO₄)₃?

The total number of non-bonding electrons in the NF₃ molecule is ________.

Of the following solids, NaI, NaF, MgO, MgCl₂, and KF, the solid with the highest melting point is ________.

For two ions with charges q₁ and q₂ separated by distance r, the potential energy canbe calculated from Coulomb's law: E = Calculate the energy released when 1 mole NaCl is formed if the constant k = 1.11 × 10^-10 C²/J·m, the charge Na⁺ = +1 e, and the charge on Cl^- is -1 e, e = 1.602 × 10^-19 C, and

Which ion of uranium has a noble gas electron configuration?

When the Lewis structure for the nitrite ion is drawn, based on formal charge considerations, there are four bonds in its structure.

In the nitrogen monoxide molecule, the dipole moment is 0.16 D and the bond length is 115 pm. Determine the sign and magnitude of the charge on the oxygen atom. Hint: Watch your units carefully with this problem.

Which ion has a noble gas electron configuration?

Arrange the following in terms of decreasing electronegativity values.P, O, As, S Hint: Remember to refer to your periodic table for trends.

Draw the Lewis structure for HNO_2. If the valence shells are filled to the usual limit (a maximum of 8) , how many nonbonding valence electrons are in the molecule?

The Lewis symbol for the oxygen atom shows ________ valence shell electrons. The number of covalent bonds that oxygen normally forms to complete its valence shell and obey the octet rule is ________.

Based on the skeleton structure, N-N-O, the magnitude of the sum of the partial charges for N₂O has to be 4. Hint: Write out the full Lewis structure and remember your double and triple bonds.

Use the data to calculate the lattice energy of lithium chloride.