Question 1

How many hydrogen atoms must bond to silicon to give it an octet of valence electrons?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5

Question 2

Write the balanced chemical equation for the reaction for which ΔH˚rxn is the lattice energy for potassium bromide.

Accepted Answer

KBr (s)→ K...

Question 3

Of the following, __________ cannot accommodate more than an octet of electrons.

Accepted Answer

A)  Ni
B)  As
C)  C
D)  V
E)  Y

Question 4

The central atom in __________ does not violate the octet rule.

Accepted Answer

A)  SF4
B)  KrF2
C)  CF4
D)  XeF4
E)  ICl4-

Question 5

There can be four equivalent best resonance structures of __________.

Accepted Answer

A)  (i) 
B)  (ii) 
C)  (iii) 
D)  (iv) 
E)  (v)

Question 6

Most transition metals do not form ions with a noble gas configuration.

Accepted Answer

A) True 
 B)False

Question 7

There are __________ paired and __________ unpaired electrons in the Lewis symbol for a chlorine atom.

Accepted Answer

A)  4, 2
B)  4, 1
C)  6, 1
D)  0, 5
E)  2, 5

Question 8

Why don't we draw double bonds between the Be atom and the Cl atoms in BeCl2?

Accepted Answer

A)  That would give positive formal charges to the chlorine atoms and a negative formal charge to the beryllium atom.
B)  There aren't enough electrons.
C)  That would result in more than eight electrons around beryllium.
D)  That would result in more than eight electrons around each chlorine atom.
E)  That would result in the formal charges not adding up to zero.

Question 9

Electropositivity __________ from left to right within a period and __________ from top to bottom within a group.

Accepted Answer

A)  decreases, increases
B)  increases, increases
C)  increases, decreases
D)  stays the same, increases
E)  increases, stays the same

Question 10

Using the table of average bond energies below, the △H for the reaction is __________ kJ. C≡O (g) + 2H2 (g) → H3C-O-H (g) 
Bond: C-O C=O C≡O C-H H-H O-H
D (kJ/mol) : 358 799 1072 413 436 463

Accepted Answer

A)  +276
B)  -276
C)  +735
D)  -735
E)  -116

Question 11

A valid Lewis structure of __________ cannot be drawn without violating the octet rule.

Accepted Answer

A)  PO43-
B)  SiF4
C)  CF4
D)  SeF4
E)  NF3

Question 12

The formula of palladium(IV) sulfide is __________.

Accepted Answer

A)  Pd2S4
B)  PdS4
C)  Pd4S
D)  PdS2
E)  Pd2S2

Question 13

A triple bond consists of __________ pairs of electrons shared between two atoms.

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  6

Question 14

Electronegativity __________ from left to right within a period and __________ from top to bottom within a group.

Accepted Answer

A)  decreases, increases
B)  increases, increases
C)  increases, decreases
D)  stays the same, increases
E)  increases, stays the same

Question 15

Bond enthalpy is __________.

Accepted Answer

A)  always positive
B)  always negative
C)  sometimes positive, sometimes negative
D)  always zero
E)  unpredictable

Question 16

The bond length in an HI molecule is 1.61 Å and the measured dipole moment is 0.44 D. What is the magnitude (in units of e) of the negative charge on I in HI? (1 debye = 3.34 × 10-30 coulomb-meters; e=1.6 × 10-19 coulombs)

Accepted Answer

A)  1.6 × 10-19
B)  0.057
C)  9.1
D)  1
E)  0.22

Question 17

Which energy change corresponds to the first ionization energy of potassium?

Accepted Answer

A)  2
B)  5
C)  4
D)  3
E)  6

Question 18

Of the molecules below, the bond in __________ is the most polar.

Accepted Answer

A)  HBr
B)  HI
C)  HCl
D)  HF
E)  H2

Question 19

For a given arrangement of ions, the lattice energy decreases as ionic radius __________ and as ionic charge __________.

Accepted Answer

A)  decreases, increases
B)  increases, decreases
C)  increases, increases
D)  decreases, decreases
E)  This cannot be predicted.

Question 20

Which of the following would have to lose two electrons in order to achieve a noble gas electron configuration? O Sr Na Se Br

Accepted Answer

A)  O, Se
B)  Sr
C)  Na
D)  Br
E)  Sr, O, Se

Exam 8: Basic Concepts of Chemical Bonding

For a given arrangement of ions, the lattice energy decreases as ionic radius __________ and as ionic charge __________.

Correct AnswerverifiedShow Answer

Of the molecules below, the bond in __________ is the most polar.

Correct AnswerverifiedShow Answer

Using the table of average bond energies below, the △H for the reaction is __________ kJ. C≡O (g) + 2H2 (g) → H3C-O-H (g) Bond: C-O C=O C≡O C-H H-H O-H D (kJ/mol) : 358 799 1072 413 436 463

Correct AnswerverifiedShow Answer

A valid Lewis structure of __________ cannot be drawn without violating the octet rule.

Correct AnswerverifiedShow Answer

Why don't we draw double bonds between the Be atom and the Cl atoms in BeCl2?

Correct AnswerverifiedShow Answer

The formula of palladium(IV) sulfide is __________.

Correct AnswerverifiedShow Answer

Of the following, __________ cannot accommodate more than an octet of electrons.

Correct AnswerverifiedShow Answer

A triple bond consists of __________ pairs of electrons shared between two atoms.

Correct AnswerverifiedShow Answer

Which energy change corresponds to the first ionization energy of potassium?

Correct AnswerverifiedShow Answer

There can be four equivalent best resonance structures of __________.

Correct AnswerverifiedShow Answer

Electropositivity __________ from left to right within a period and __________ from top to bottom within a group.

Correct AnswerverifiedShow Answer

How many hydrogen atoms must bond to silicon to give it an octet of valence electrons?

Correct AnswerverifiedShow Answer

The central atom in __________ does not violate the octet rule.

Correct AnswerverifiedShow Answer

The bond length in an HI molecule is 1.61 Å and the measured dipole moment is 0.44 D. What is the magnitude (in units of e) of the negative charge on I in HI? (1 debye = 3.34 × 10-30 coulomb-meters; e=1.6 × 10-19 coulombs)

Correct AnswerverifiedShow Answer

There are __________ paired and __________ unpaired electrons in the Lewis symbol for a chlorine atom.

Correct AnswerverifiedShow Answer

Write the balanced chemical equation for the reaction for which ΔH˚rxn is the lattice energy for potassium bromide.

Correct AnswerverifiedKBr (s)→ K...View AnswerShow Answer

Which of the following would have to lose two electrons in order to achieve a noble gas electron configuration? O Sr Na Se Br

Correct AnswerverifiedShow Answer

Bond enthalpy is __________.

Correct AnswerverifiedShow Answer

Electronegativity __________ from left to right within a period and __________ from top to bottom within a group.

Correct AnswerverifiedShow Answer

Most transition metals do not form ions with a noble gas configuration.

Correct AnswerverifiedShow Answer

For a given arrangement of ions, the lattice energy decreases as ionic radius and as ionic charge .

Correct Answer
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Correct Answer
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Using the table of average bond energies below, the △H for the reaction is __________ kJ. C≡O (g) + 2H₂ (g) → H₃C-O-H (g) Bond: C-O C=O C≡O C-H H-H O-H D (kJ/mol) : 358 799 1072 413 436 463

Correct Answer
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Correct Answer
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Why don't we draw double bonds between the Be atom and the Cl atoms in BeCl₂?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Electropositivity from left to right within a period and from top to bottom within a group.

Correct Answer
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Correct Answer
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Correct Answer
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The bond length in an HI molecule is 1.61 Å and the measured dipole moment is 0.44 D. What is the magnitude (in units of e) of the negative charge on I in HI? (1 debye = 3.34 × 10^-30 coulomb-meters; e=1.6 × 10^-19 coulombs)

Correct Answer
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There are paired and unpaired electrons in the Lewis symbol for a chlorine atom.

Correct Answer
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Write the balanced chemical equation for the reaction for which ΔH˚_rxn is the lattice energy for potassium bromide.

Correct Answer
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KBr (s)→ K...
View Answer

Correct Answer
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Correct Answer
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Electronegativity from left to right within a period and from top to bottom within a group.

Correct Answer
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Correct Answer
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