Question 1

Which ion cannot be considered to have 8 valence electrons?

Accepted Answer

A)  H-
B)  Na+
C)  Al3+
D)  P3-
E)  ArF) A) and B)
G) All of the above

Question 2

What is the correct name for Mg3(PO4)2?

Accepted Answer

Question 3

Describe how and why formal charges are used to choose between two possible Lewis structures for a molecule.

Accepted Answer

Formal charges are used to identify the ...

Question 4

Which of the following statements is false regarding the Lewis structure of trichloroacetic acid,CH2Cl3O2? A partial bonding framework is given. 2Cl3O2? A partial bonding framework is given.   A) The atom at position  X  is hydrogen. B) In the correct and complete Lewis structure,the atom at position  D  violates the octet rule. C) Another double bond is required in order for all of the atoms to attain full valence shells. D) The oxygen atom shown has two pairs of nonbonding electrons. E) In the correct and complete Lewis structure,all of the chlorine atoms have nonbonding pairs of electrons." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  The atom at position "X" is hydrogen.
B)  In the correct and complete Lewis structure,the atom at position "D" violates the octet rule.
C)  Another double bond is required in order for all of the atoms to attain full valence shells.
D)  The oxygen atom shown has two pairs of nonbonding electrons.
E)  In the correct and complete Lewis structure,all of the chlorine atoms have nonbonding pairs of electrons.F) A) and B)
G) B) and E)

Question 5

Which one of the ionic compounds below would you expect to have the largest (most negative) lattice energy?

Accepted Answer

A)  MgO
B)  CaO
C)  SrO
D)  BaO
E)  BeOF) B) and D)
G) C) and E)

Question 6

Which of the following compounds is likely to have the least reactive hydrogen?

Accepted Answer

A)  H - Br (141 pm) 
B)  H - I (161 pm) 
C)  H - Cl (127 pm) 
D)  H - F (92 pm) 
E)  H - S  (in H2S; 134 pm) F) A) and E)
G) B) and E)

Question 7

Aqua regia is a mixture of hydrochloric acid and nitric acid that is capable of dissolving gold.What are the formulas of these acids?

Accepted Answer

A)  HClO,HNO4
B)  HClO4,HNO3
C)  HCl,HNO2
D)  HCl,HNO3
E)  HCl,HNOF) A) and D)
G) All of the above

Question 8

Nitrite (NO2-) is an important nutrient in the eutrophic zone of the ocean.Which of the following is the best set of resonance structures for this ion? 2-) is an important nutrient in the eutrophic zone of the ocean.Which of the following is the best set of resonance structures for this ion?   A) a B) b C) c D) d E) none of these" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  none of theseF) B) and D)
G) A) and B)

Question 9

Carbonyl fluoride (COF2)is similar in structure to phosgene (COCl2)and both are highly toxic.Draw the Lewis structure of COF2.

Accepted Answer

Question 10

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

Accepted Answer

A)  12
B)  14
C)  16
D)  18
E)  20F) A) and D)
G) A) and C)

Question 11

Coulomb's law states that the interaction energy between ions depends __________

Accepted Answer

A)  only on the ionic charges.
B)  only on the distance between the ions.
C)  directly on both the ionic charges and the distance between the ions.
D)  on the temperature.
E)  directly on the ionic charges and inversely on the distance between the ions.F) A) and E)
G) B) and D)

Question 12

What is the total number of electrons assigned to the oxygen atom in the Lewis structure of formaldehyde (H2CO) ?

Accepted Answer

A)  8
B)  6
C)  4
D)  2
E)  10F) C) and D)
G) D) and E)

Question 13

Which of the following requires the smallest energy to separate the ions?

Accepted Answer

A)  CaF2
B)  KF
C)  NaF
D)  MgF2
E)  LiFF) B) and C)
G) B) and D)

Question 14

Draw the Lewis structure of boron trifluoride.

Accepted Answer

The answer of Draw the Lewis structure of boron trifluoride....

Question 15

Vinegar is a solution of acetic acid (CH3COOH) and water.Which of the following is the Lewis structure for acetic acid? 3COOH) and water.Which of the following is the Lewis structure for acetic acid?    A) a B) b C) c D) d E) none of these" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  none of theseF) A) and D)
G) None of the above

Question 16

Which of the following molecular ions has 3 valence electrons in its Lewis structure?

Accepted Answer

A)  H2+
B)  He2+
C)  C2+
D)  B2+
E)  O2-F) A) and B)
G) B) and E)

Question 17

Which of the following statements regarding the Lewis structure of atoms and ions is NOT true?

Accepted Answer

A)  Charges on ions must be explicitly shown.
B)  A magnesium ion with a +2 charge has no electron dots shown.
C)  A neutral oxygen atom has two pairs of electron dots and two unpaired dots shown.
D)  The chloride ion with a -1 charge has eight valence electrons dots shown.
E)  The sodium ion has eight valence electron dots shown.F) B) and C)
G) B) and D)

Question 18

Which of the following are listed in order of decreasing electronegativity?

Accepted Answer

A)  F > S > Na > H
B)  F > N > P > O
C)  N > P > Si > S
D)  F > S > Se > Sb
E)  Te > Se > S > OF) B) and E)
G) A) and E)

Question 19

Rank the following species in order of decreasing carbon-oxygen bond energy: CO,CO2,CO32-.

Accepted Answer

From largest to smal...

Question 20

Which of the following is the longest bond? The number in parentheses is the bond energy.

Accepted Answer

A)  C - C (348 kJ/mol) 
B)  C - F (453 kJ/mol) 
C)  C - H (411 kJ/mol) 
D)  C - Cl (339 kJ/mol) 
E)  C - O (358 kJ/mol) F) A) and C)
G) B) and D)

Exam 4: Chemical Bonding-Understanding Climate Change

Describe how and why formal charges are used to choose between two possible Lewis structures for a molecule.

Correct AnswerverifiedFormal charges are used to identify the ...View AnswerShow Answer

Rank the following species in order of decreasing carbon-oxygen bond energy: CO,CO2,CO32-.

Correct AnswerverifiedFrom largest to smal...View AnswerShow Answer

Which of the following requires the smallest energy to separate the ions?

Correct AnswerverifiedShow Answer

Which of the following molecular ions has 3 valence electrons in its Lewis structure?

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Which of the following is the longest bond? The number in parentheses is the bond energy.

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Nitrite (NO2-) is an important nutrient in the eutrophic zone of the ocean.Which of the following is the best set of resonance structures for this ion?

Correct AnswerverifiedShow Answer

Which of the following statements is false regarding the Lewis structure of trichloroacetic acid,CH2Cl3O2? A partial bonding framework is given.

Correct AnswerverifiedShow Answer

What is the total number of electrons assigned to the oxygen atom in the Lewis structure of formaldehyde (H2CO) ?

Correct AnswerverifiedShow Answer

Coulomb's law states that the interaction energy between ions depends __________

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

Correct AnswerverifiedShow Answer

What is the correct name for Mg3(PO4)2?

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Draw the Lewis structure of boron trifluoride.

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Carbonyl fluoride (COF2)is similar in structure to phosgene (COCl2)and both are highly toxic.Draw the Lewis structure of COF2.

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Vinegar is a solution of acetic acid (CH3COOH) and water.Which of the following is the Lewis structure for acetic acid?

Correct AnswerverifiedShow Answer

Which ion cannot be considered to have 8 valence electrons?

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Aqua regia is a mixture of hydrochloric acid and nitric acid that is capable of dissolving gold.What are the formulas of these acids?

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Which of the following statements regarding the Lewis structure of atoms and ions is NOT true?

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Which of the following are listed in order of decreasing electronegativity?

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Which of the following compounds is likely to have the least reactive hydrogen?

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Which one of the ionic compounds below would you expect to have the largest (most negative) lattice energy?

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Correct Answer
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Formal charges are used to identify the ...
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Rank the following species in order of decreasing carbon-oxygen bond energy: CO,CO₂,CO₃²^-.

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From largest to smal...
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Nitrite (NO₂^-) is an important nutrient in the eutrophic zone of the ocean.Which of the following is the best set of resonance structures for this ion?

Correct Answer
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Which of the following statements is false regarding the Lewis structure of trichloroacetic acid,CH₂Cl₃O₂? A partial bonding framework is given.

Correct Answer
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What is the total number of electrons assigned to the oxygen atom in the Lewis structure of formaldehyde (H₂CO) ?

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

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What is the correct name for Mg₃(PO₄)₂?

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Carbonyl fluoride (COF₂)is similar in structure to phosgene (COCl₂)and both are highly toxic.Draw the Lewis structure of COF₂.

Correct Answer
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Vinegar is a solution of acetic acid (CH₃COOH) and water.Which of the following is the Lewis structure for acetic acid?

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