Exam 8: Chemical Bonds: What Makes a Gas a Greenhouse Gas

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Which of these statements correctly describes the use of formal charge in choosing between possible Lewis structures to describe a molecule? I. Formal charge on all the atoms should be zero, or at least the smallest possible value. II. The sum of the formal charges on all the atoms should equal the charge on the molecule Or ion. III. The formal charge on an atom is not affected by the electronegativity of the atom. IV. In an anion containing nitrogen and oxygen, the Lewis structures with a negative charge On the nitrogen will contribute the most to the description of the bonding.

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Describe the relationship between bond order, bond energy, and bond length.

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In comparing the length and strength of single, double, and triple bonds between the same pair of atoms, the ________

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Using the positions of the atoms in the periodic table, identify which of the following bonds is expected to be most polar: CF, ClF, SiF, SF, OF.

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Trends in electronegativity are primarily a result of ________

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Which of the following elements contains the fewest number of valence electrons?

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How many total equivalent Lewis structures are needed to describe the cyclic compound benzene, C6H6? How many total equivalent Lewis structures are needed to describe the cyclic compound benzene, C<sub>6</sub>H<sub>6</sub>?

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Draw three reasonable Lewis structures for the thiocarbonate ion (SCO22). Identify the most stable form by using the concept of formal charges. Explain the reason for your choice.

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How many valence electrons does F have?

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An Si-Si linkage would be classified as what type of bonding interaction?

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How many total shared electrons are there in the Lewis structure of CS2?

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Draw the Lewis structure for the carbonate anion, CO32. Include resonance structures if necessary.

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Which statement A-D regarding formal charge is not correct?

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Which statement provides the best description of an ionic bond?

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How many valence electrons are there in a correctly drawn Lewis structure for formamide, HCONH2?

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Which molecule has the shortest single bond?

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Identify which of the molecules below violates the octet rule. I.ClF3 II. SF4 III.PCl3 IV. SOCl2

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In a chemical reaction, bonds are broken and new bonds are formed. Which one of the following statements regarding bond energies is correct?

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How many valence electrons does S2- have?

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In the following molecule, identify a) the strongest bond in the molecule and b) the longest bond in the molecule. In the following molecule, identify a) the strongest bond in the molecule and b) the longest bond in the molecule.

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