Question 1

How many pairs of nonbonding electrons are in the valence shell of the central iodine atom in the I3- ion?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4F) B) and D)
G) B) and C)

Question 2

Which of the following molecules is (are)  nonpolar?

Accepted Answer

A)   OIF5
B)   ClF3
C)   XeF2
D)   O2
E)   both c and dF) B) and D)
G) B) and C)

Question 3

Our response to the anthrax scare was a 20-year-old antibacterial known as ciprofloxacin or "Cipro."

Apply the concept of formal charge to the three nitrogen atoms labeled 1, 2 and 3. Are they neutral, negatively charged, or positively charged?

Accepted Answer

A)   N(1)  = -1, N(2)  = -1, and N(3)  = -1
B)   N(1)  = -1, N(2)  = 0, and N(3)  = 0
C)   N(1)  = 0, N(2)  = 0, and N(3)  = 0
D)   N(1)  = 0, N(2)  = +1, and N(3)  = +1
E)   N(1)  = +1, N(2)  = +1, and N(3)  = +1F) B) and D)
G) B) and C)

Question 4

What would be the distribution of electrons in the valence shell of the "X" atom in the previous question?

Accepted Answer

A)   trigonal planar
B)   tetrahedral
C)   trigonal bipyramidal
D)   octahedral
E)   none of theseF) A) and C)
G) B) and D)

Question 5

When the rare gas elements (He, Ne, Ar, Kr, Xe and Rn)  were first
Discovered, a sample of Ar was sent to Moissan, who had discovered the most active of the known elements: F2. The failure of Moissan's attempts to react argon with fluorine, coupled with repeated failures by other chemists to get the more abundant of these gases to undergo chemical reaction, eventually led to their being labeled inert gases. We now know this isn't so. Xe reacts with F2 to form a variety of compounds, including XeF4. Which of the following best describes the XeF4 molecule?

Accepted Answer

A)   Trigonal bipyramidal distribution of valence electrons on the Xe with a T-shaped molecular geometry.
B)   Trigonal bipyramidal distribution of valence electrons on the Xe with a trigonal planar molecular geometry.
C)   Trigonal bipyramidal distribution of valence electrons on the Xe with a pyramidal molecular geometry.
D)   Octahedral distribution of valence electrons on the Xe with a square planar molecular geometry.
E)   Octahedral distribution of valence electrons on the Xe with a seesaw molecular geometry.F) C) and E)
G) B) and E)

Question 6

Assume that the XF3 molecule has the following Lewis structure. 
3 molecule has the following Lewis structure.     The molecule could be: A)  boron trifluoride, i.e., X = B B)  nitrogen trifluoride, i.e., X = N C)  chlorine trifluoride, i.e., X = Cl D)  phosphorus trifluoride, i.e., X = P E)  more than one of the above" class="answers-bank-image d-inline" rel="preload" >
 The molecule could be:

Accepted Answer

A)   boron trifluoride, i.e., X = B
B)   nitrogen trifluoride, i.e., X = N
C)   chlorine trifluoride, i.e., X = Cl
D)   phosphorus trifluoride, i.e., X = P
E)   more than one of the aboveF) All of the above
G) A) and E)

Question 7

How many   pairs 	extbf{       pairs  } pairs    of nonbonding electrons are in the valence shell of the iodine atom in the IF2- ion?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4 F) A) and C)
G) A) and E)

Question 8

Use formal charge to decide which of the following skeleton structures will give the best Lewis structure of the molecule. Show the values of formal charge and explain your choice of the best structure.

Accepted Answer

All atoms in the structure on the left h...

Question 9

If there is a single pair of nonbonding electrons on the "X" atom in the Lewis structure of XF4, in which group of the periodic table would you be the most likely to find element "X"?

Accepted Answer

A)   Group IlIA
B)   Group IVA
C)   Group VA
D)   Group VIA
E)   Group VIIAF) B) and C)
G) A) and B)

Question 10

The shape of the NO2- ion is best described as:

Accepted Answer

A)   linear
B)   T-shaped
C)   bent
D)   square planar
E)   pyramidalF) A) and C)
G) A) and E)

Question 11

The best way for the body to get rid of excess nitrogen from the metabolism of proteins is by excreting urea, a planar molecule which has the following Lewis structure.

Which element does the "X"stand for in this Lewis structure?

Accepted Answer

A)   C
B)   N
C)   O
D)   P
E)   SF) A) and B)
G) A) and C)

Question 12

Which of the following molecules or ions doesn't have a tetrahedral shape?

Accepted Answer

A)   SiF4
B)   NF4+
C)   BF4-
D)   SeF4
E)   CF4F) A) and E)
G) None of the above

Question 13

Bond dissociation energies are defined as the energy per bond required to break apart 1 mole of a gas-phase molecule into its atoms in the gas phase. These values for bonds between different atoms are listed in tables and represents average energies of bonds over many different molecules. For example the actual strength of a nitrogen-oxygen bond will vary slightly from one molecule to another. Consider NO+, NO3-, HNO. Order these three molecules in terms of increasing NO bond strength (bond energy). Show work to support your answer and explain your reasoning.

Accepted Answer

NO₃^- < HNO < NO⁺ NO⁺ contains an NO triple b...

Question 14

Which element will combine with sulfur to form a linear molecule with the formula XS2?

Accepted Answer

A)   Li
B)   B
C)   C
D)   O
E)   FF) B) and D)
G) B) and E)

Question 15

Use the same molecular orbital diagram to predict which of the following molecules should be paramagnetic.
 (I)  B2 (II)  C2 (III)  N2 (IV)  O2 (V)  F2

Accepted Answer

A)   I
B)   I and II
C)   I and IV
D)   I, II and IV
E)   II, III and IVF) A) and B)
G) A) and E)

Question 16

What is element X in the following Lewis structure?

Accepted Answer

A)   B
B)   C
C)   N
D)   O
E)   FF) B) and D)
G) A) and B)

Question 17

The correct Lewis structure for the NO2+ ion has:

Accepted Answer

A)   2 double bonds and eight nonbonding electrons
B)   1 double bond, 1 single bond, and 12 nonbonding electrons
C)   2 single bonds and 12 nonbonding electrons
D)   2 triple bonds and 4 nonbonding electrons
E)   1 single bond, 1 double bond, and 8 nonbonding electronsF) B) and C)
G) B) and E)

Question 18

Which of the following species isn't planar?

Accepted Answer

A)   SO3
B)   SO32-
C)   SO2
D)   BF3
E)   NO3-F) A) and B)
G) C) and D)

Question 19

If X is a 3rd row element and XCl3 has the Lewis structure 3 has the Lewis structure    X must be: A)  Al B)  Si C)  P D)  S E)  Cl" class="answers-bank-image d-inline" rel="preload" > 
X must be:

Accepted Answer

A)   Al
B)   Si
C)   P
D)   S
E)   ClF) None of the above
G) A) and D)

Question 20

Which of the following molecules is best described with two resonance structures?

Accepted Answer

A)   NO2-
B)   H2O
C)   OF2
D)   ClNO
E)   BeF2F) A) and E)
G) B) and D)

Exam 4: The Covalent Bond

What would be the distribution of electrons in the valence shell of the "X" atom in the previous question?

Correct Answer
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If X is a 3rd row element and XCl₃ has the Lewis structure X must be:

Correct Answer
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The best way for the body to get rid of excess nitrogen from the metabolism of proteins is by excreting urea, a planar molecule which has the following Lewis structure. Which element does the "X"stand for in this Lewis structure?

Correct Answer
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The correct Lewis structure for the NO₂⁺ ion has:

Correct Answer
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How many pairs of nonbonding electrons are in the valence shell of the central iodine atom in the I₃^- ion?

Correct Answer
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Which element will combine with sulfur to form a linear molecule with the formula XS₂?

Correct Answer
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Correct Answer
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NO₃^- < HNO < NO⁺ NO⁺ contains an NO triple b...
View Answer

Use formal charge to decide which of the following skeleton structures will give the best Lewis structure of the molecule. Show the values of formal charge and explain your choice of the best structure.

Correct Answer
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All atoms in the structure on the left h...
View Answer

Which of the following molecules is (are) nonpolar?

Correct Answer
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What is element X in the following Lewis structure?

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Which of the following species isn't planar?

Correct Answer
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If there is a single pair of nonbonding electrons on the "X" atom in the Lewis structure of XF₄, in which group of the periodic table would you be the most likely to find element "X"?

Correct Answer
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The shape of the NO₂^- ion is best described as:

Correct Answer
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Our response to the anthrax scare was a 20-year-old antibacterial known as ciprofloxacin or "Cipro." Apply the concept of formal charge to the three nitrogen atoms labeled 1, 2 and 3. Are they neutral, negatively charged, or positively charged?

Correct Answer
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Assume that the XF₃ molecule has the following Lewis structure. The molecule could be:

Correct Answer
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Correct Answer
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Which of the following molecules or ions doesn't have a tetrahedral shape?

Correct Answer
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Which of the following molecules is best described with two resonance structures?

Correct Answer
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Use the same molecular orbital diagram to predict which of the following molecules should be paramagnetic. (I) B₂ (II) C₂ (III) N₂ (IV) O₂ (V) F₂

Correct Answer
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How many $\textbf{ pairs }$ of nonbonding electrons are in the valence shell of the iodine atom in the IF₂^- ion?

Correct Answer
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Exam 4: The Covalent Bond

What would be the distribution of electrons in the valence shell of the "X" atom in the previous question?

Correct AnswerverifiedShow Answer

If X is a 3rd row element and XCl3 has the Lewis structure X must be:

Correct AnswerverifiedShow Answer

The best way for the body to get rid of excess nitrogen from the metabolism of proteins is by excreting urea, a planar molecule which has the following Lewis structure. Which element does the "X"stand for in this Lewis structure?

Correct AnswerverifiedShow Answer

The correct Lewis structure for the NO2+ ion has:

Correct AnswerverifiedShow Answer

How many pairs of nonbonding electrons are in the valence shell of the central iodine atom in the I3- ion?

Correct AnswerverifiedShow Answer

Which element will combine with sulfur to form a linear molecule with the formula XS2?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedNO3- < HNO < NO+ NO+ contains an NO triple b...View AnswerShow Answer

Use formal charge to decide which of the following skeleton structures will give the best Lewis structure of the molecule. Show the values of formal charge and explain your choice of the best structure.

Correct AnswerverifiedAll atoms in the structure on the left h...View AnswerShow Answer

Which of the following molecules is (are) nonpolar?

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What is element X in the following Lewis structure?

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Which of the following species isn't planar?

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If there is a single pair of nonbonding electrons on the "X" atom in the Lewis structure of XF4, in which group of the periodic table would you be the most likely to find element "X"?

Correct AnswerverifiedShow Answer

The shape of the NO2- ion is best described as:

Correct AnswerverifiedShow Answer

Our response to the anthrax scare was a 20-year-old antibacterial known as ciprofloxacin or "Cipro." Apply the concept of formal charge to the three nitrogen atoms labeled 1, 2 and 3. Are they neutral, negatively charged, or positively charged?

Correct AnswerverifiedShow Answer

Assume that the XF3 molecule has the following Lewis structure. The molecule could be:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following molecules or ions doesn't have a tetrahedral shape?

Correct AnswerverifiedShow Answer

Which of the following molecules is best described with two resonance structures?

Correct AnswerverifiedShow Answer

Use the same molecular orbital diagram to predict which of the following molecules should be paramagnetic. (I) B2 (II) C2 (III) N2 (IV) O2 (V) F2

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How many pairs \textbf{ pairs } pairs of nonbonding electrons are in the valence shell of the iodine atom in the IF2- ion?

Correct AnswerverifiedShow Answer

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If X is a 3rd row element and XCl₃ has the Lewis structure X must be:

Correct Answer
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The correct Lewis structure for the NO₂⁺ ion has:

Correct Answer
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How many pairs of nonbonding electrons are in the valence shell of the central iodine atom in the I₃^- ion?

Correct Answer
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Which element will combine with sulfur to form a linear molecule with the formula XS₂?

Correct Answer
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Correct Answer
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NO₃^- < HNO < NO⁺ NO⁺ contains an NO triple b...
View Answer

Correct Answer
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All atoms in the structure on the left h...
View Answer

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Correct Answer
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Correct Answer
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If there is a single pair of nonbonding electrons on the "X" atom in the Lewis structure of XF₄, in which group of the periodic table would you be the most likely to find element "X"?

Correct Answer
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The shape of the NO₂^- ion is best described as:

Correct Answer
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Assume that the XF₃ molecule has the following Lewis structure. The molecule could be:

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Use the same molecular orbital diagram to predict which of the following molecules should be paramagnetic. (I) B₂ (II) C₂ (III) N₂ (IV) O₂ (V) F₂

Correct Answer
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How many $\textbf{ pairs }$ of nonbonding electrons are in the valence shell of the iodine atom in the IF₂^- ion?

Correct Answer
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