AP Chem Unit 2 Review

Why can a molecule with the structure of NBr₅ not exist?

• Nitrogen only has two energy levels and is thus unable to expand its octet.

• Bromine is much larger than nitrogen and cannot be a terminal atom in this molecule.

• It is impossible to complete the octets for all size atoms using only valence electrons.

• Nitrogen does not have a low enough electronegativity to be the central atom of this molecule.

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Which of the following compounds would have the highest lattice energy?

• LiF

• MgCl₂

• CaBr₂

• C₂H₆

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Lewis diagrams for the nitrate and nitrite ions are shown. Choose the statement that correctly describes the relationship between the relationship between the two ions in terms of bond length and bond energy.

• Nitrite has longer and stronger bonds than nitrate.

• Nitrite has longer and weaker bonds than nitrate.

• Nitrite has shorter and stronger bonds than nitrate.

• Nitrite has shorter and weaker bonds than nitrate.

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The graph shows the amount of potential energy between two hydrogen atoms as the distance between them changes. At which point in the graph would a molecule of H₂ be the most stable?

• A

• B

• C

• D

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What is the molecular geometry for Structure A?

• tetrahedral

• trigonal planar

• trigonal pyramidal

• octahedral

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What is the S-O bond order in Structure B?

• 1.00

• 1.33

• 1.50

• 1.67

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Which of the following statements regarding Structure B is true?

• The double bonds must be located opposite of each other due to additional electron repulsion.

• It is a more polar molecule than the molecule represented by Structure A.

• The bonds in the molecule are weaker than those in Structure A.

• All bonds in the molecule are identical to each other.

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Which structure is more likely to correspond with the actual Lewis diagram for the sulfate ion?

• Structure A; single bonds are more stable than double bonds.

• Structure A; it has the most unshared pairs of electrons.

• Structure B; there are more possible resonance structures.

• Structure B; fewer atoms have formal charges.

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Which of the following pairs of elements is most likely to create an interstitial alloy?

• Titanium and Copper

• Aluminum and Lead

• Silver and Tin

• Magnesium and Calcium

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Which of the following substances would be the best conductor of electricity?

• 1.0 M KF

• 1.0 M CCl₄

• 1.0 M BaS

• 1.0 M SrBr₂

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