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Exam 5: Chemical Bonding: the Covalent Bond Model

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Question 1

Multiple Choice

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In which of the following bonds is the bond polarity incorrect?

A)
B)
C)
D)

E) A) and B)
F) All of the above

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Question 2

Multiple Choice

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In which of the following pairs of triatomic species do both members of the pair have the same geometry?

A) H₂O and H₂S
B) NO₂⁺ and NO₂^-
C) HCN and FNO
D) more than one correct response
E) no correct response

F) None of the above
G) A) and B)

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Question 3

Multiple Choice

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Electronegativity is a concept that is useful along with other concepts in

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) An unpaired electron is present in the Lewis structure for the molecule NO. (2) The molecule nitric oxide is naturally present in the human body. (3) The acronym OPR stands for odor replication process.

Use the following to answer the questions below: For each of the compounds, select from the response list the correct number of atoms present in a molecule of the compound. Responses on the right may be used more than once or need not be used at all. a) contains three or fewer atoms b) contains four atoms c) contains five atoms d) contains six or more atoms -Select the correct number of atoms in one molecule of methane.

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) Once a coordinate covalent bond is formed, there is no way to distinguish it from any of the other covalent bonds in a molecule. (2) The least electronegative elements are located to the far right in the periodic table. (3) The central concept of VSEPR theory is that the electron groups in the valence shell of a central atom in a molecule attract each other.

What is the geometry of the molecular compound formed by the reaction of sulfur with hydrogen?

A and X are different elements with different electronegativities. What choice below best describes the polarity of the bonds and molecule in a linear A-A-X?

The total number of nonbonding electron pairs present in the Lewis structure of SiH₄ is

VSEPR theory predicts that the geometry of the AsH₃ molecule is

A, X, and Z are different elements with different electronegativities. What choice below best describes the polarity of the bonds and molecule in a linear Z-A-X?

Coordinate covalent bonds differ from normal covalent bonds in that:

An angular geometry is associated with molecules in which the central atom has

Characterize the bond that forms between Li (1.0) and O (3.5) .

Choose the correct number of electrons in the Lewis structure for NH₃.

In which of the following triatomic molecules or ions are both of the bonds multiple bonds?

Compound that is nonpolar

Use the following to answer the questions below: For each of the compounds, select from the response list the correct number of atoms present in a molecule of the compound. Responses on the right may be used more than once or need not be used at all. a) contains three or fewer atoms b) contains four atoms c) contains five atoms d) contains six or more atoms -Select the correct number of atoms in one molecule of nitrogen dioxide.

Choose the correct number of shared electrons contributed by oxygen to the coordinate covalent bond in CO.

Characterize the bond that forms between Be (1.5) and C (2.5) .