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Partial charge, formal charge and oxidation number are all used to describe the arrangement of electrons or charge associated with atoms within a molecule. Determine the formal charge, partial charge and oxidation number on both atoms in IBr. Give a one sentence description for each of the three calculations describing what the calculation tells you. Which of these three calculations most accurately describes the distribution of charge between I and Br? Partial charge, formal charge and oxidation number are all used to describe the arrangement of electrons or charge associated with atoms within a molecule. Determine the formal charge, partial charge and oxidation number on both atoms in IBr. Give a one sentence description for each of the three calculations describing what the calculation tells you. Which of these three calculations most accurately describes the distribution of charge between I and Br?

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Br: 0, -0.065, -1; I: 0, +0.065, +1
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The partial charge on F in the molecule ClF is ____ ENCl = 3.16 ENF = 3.98


A) - 1
B) - 0.11
C) 0
D) + 0.11
E) none of the above

F) All of the above
G) A) and C)

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Which of the following bond lengths is the largest?


A) H-C
B) H-S
C) H-O
D) H-F
E) H-H

F) C) and D)
G) A) and E)

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Which bond length is the shortest in the following compound? Which bond length is the shortest in the following compound? A) HF-C B) Cl-C C) F-C D) C-O E) O-H


A) HF-C
B) Cl-C
C) F-C
D) C-O
E) O-H

F) A) and D)
G) D) and E)

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Which of the following molecules is most polar?


A) CF4
B) BrCl5
C) PCl5
D) SCl6
E) XeF2

F) A) and E)
G) D) and E)

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Which of the following factors influence the polarity of a bond between two atoms?


A) The number of non-bonding pairs around the two atoms.
B) The bond distance between the atoms
C) The partial charge on the two atoms.
D) Both the number of non-bonding pairs and the partial charge.
E) Both the bond distance and the partial charge.

F) A) and C)
G) B) and D)

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The correct Lewis structure for CH2Cl2 contains:


A) 2 single bonds, 2 double bonds and no nonbonding electrons
B) 4 single bonds and no nonbonding electrons
C) 4 single bonds and four nonbonding electrons
D) 2 single bonds, 2 double bonds, and eight nonbonding electrons
E) 4 single bonds and 12 nonbonding electrons

F) A) and B)
G) A) and C)

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What is the molecular geometry of the SF5+ ion?


A) see-saw
B) square planar
C) square pyramidal
D) trigonal bipyramidal
E) octahedral

F) B) and D)
G) C) and D)

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In which Group of the periodic table does element X belong if there are one pair of nonbonding electrons in the valence shell of the central atom in the XF4- ion?


A) Group IIIA
B) Group IVA
C) Group VA
D) Group VIA
E) none of these

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

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Which of the following molecules or ions isn't planar?


A) NH3
B) BF3
C) CO32-
D) NO3-
E) none of these molecules or ions are planar

F) B) and E)
G) A) and E)

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Which of the following lists the elements in the correct order of increasing electronegativity?


A) Si < S < O
B) S < Si < O
C) S < O < Si
D) Si < O < S
E) O < Si < S

F) A) and D)
G) B) and C)

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The Raschig process involves the reaction between ammonia and the hypochlorite ion to form hydrazine, which has been used as a rocket fuel. 2 NH3(aq) + OCl-(aq) →\rightarrow H2NNH2(g) + Cl-(aq) +H2O(l) There are isolated cases of individuals making hydrazine unexpectedly in their homes when cleaning a commode. They start with a cleaner that contains ammonia, and then, when this doesn't work, they mix it with a cleaner (such as Chlorox) that contains the hypochlorite ion. How many pairs of nonbonding electrons can be found on each nitrogen atom in the hydrazine molecule? (Note: Assume that there is a bond between the two nitrogen atoms in hydrazine.)


A) 0
B) 1
C) 2
D) 3
E) The two N atoms contain a different number of nonbonding electrons.

F) A) and B)
G) C) and E)

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Tellurium hydride is one of the foulest smelling compounds known. How many pairs of nonbonding electrons are in the valence shell of the tellurium atom in TeH2?


A) 0
B) 1
C) 2
D) 3
E) 4

F) B) and C)
G) D) and E)

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In which of the following compounds is the bond the least polar?


A) NaCl
B) CH4
C) CO
D) Cl2
E) HCl

F) A) and E)
G) C) and E)

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What is the hybridization of the xenon atom in the XeF3+ ion?


A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

F) B) and D)
G) B) and C)

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Which of the following compounds/ions has the shortest C-O bond length?


A) CH3OH
B) H2CO
C) CO32-
D) CH3CH2OH
E) all C-O bonds are the same length

F) A) and E)
G) D) and E)

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Terpin hydrate is an expectorant that was used for many years by people with serious coughs, such as those suffering from pneumonia. Terpin hydrate is an expectorant that was used for many years by people with serious coughs, such as those suffering from pneumonia. Use the electron domain model to predict the distribution of electron domains in the valence shell of the oxygen atoms in this compound. A) linear B) bent or angular C) trigonal planar D) tetrahedral E) trigonal bipyramidal Use the electron domain model to predict the distribution of electron domains in the valence shell of the oxygen atoms in this compound.


A) linear
B) bent or angular
C) trigonal planar
D) tetrahedral
E) trigonal bipyramidal

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

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Which of the following can be used to predict an element's electronegativity?


A) average valence electron energy
B) Lewis Structures
C) bond angles
D) bond length
E) resonance

F) C) and E)
G) A) and E)

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What is the distribution of electrons around the S atom in H2SO4? [Hint: The skeleton structure of this oxyacid is O2S(OH) 2.


A) linear
B) trigonal planar
C) tetrahedral
D) trigonal bipyramidal
E) octahedral

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

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Which of the following set of hybrid orbitals would give rise to a trigonal bipyramidal geometry?


A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

F) A) and B)
G) A) and C)

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