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CHM 331 > Quiz 2 > Flashcards

Quiz 2 Flashcards

1
Q

Determine the number of pi bonds in CH3CN.

A) 0

B) 1

C) 2

D) 3

E) 4

A

C) 2

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2
Q

Identify the compound with the weakest bond.

A) H2

B) HF

C) HCl

D) HBr

E) HI

A

E) HI

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3
Q

Which of the following is closest to the C-O-C bond angle in CH3-O-CH3?

A) 180°

B) 120°

C) 109.5°

D) 90°

E) 160°

A

C) 109.5°

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4
Q
A

E) Carbons 4,5

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5
Q

The N-H bond in the ammonium ion, NH4+, is formed by the overlap of what two orbitals?

A) sp3-sp3

B) sp3-sp2

C) sp2-sp2

D) sp2-s

E) sp3-s

A

E) sp3-s

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6
Q

What orbitals overlap to create the H-C bond in CH3+?

A) sp3-sp3

B) sp2-sp3

C) s-p

D) s-sp2

E) s-sp3

A

D) s-sp2

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7
Q

Triethylamine [(CH3CH2)3N] is a molecule in which the nitrogen atom is ________ hybridized and the CNC bond angle is ________.

A) sp2, >109.5°

B) sp2, <109.5°

C) sp3, >109.5°

D) sp3, <109.5°

E) sp, 109.5°

A

D) sp3, <109.5°

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8
Q

The carbon-carbon double bond in ethene is ________ and ________ than the carbon-carbon triple bond in ethyne.

A) stronger; shorter

B) stronger; longer

C) weaker; shorter

D) weaker; longer

E) stronger; more polar

A

D) weaker; longer

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9
Q

In what type of orbital are the lone pair electrons of methoxide (CH3O-) found ?

A) s

B) p

C) sp

D) sp2

E) sp3

A

E) sp3

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10
Q

Identify the hybridization of the oxygen in CH3OCH3.

A) sp

B) sp2

C) sp3

D) sp4

E) sp5

A

C) sp3

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11
Q

Give the H-C-H bond angle in H2CO.

A) 60

B) 90

C) 109.5

D) 120

E) 180

A

D) 120

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12
Q

Each lone pair of electrons on the O atom in methanol (CH3OH) occupies a(n) ________ orbital.

A) s

B) p

C) sp

D) sp2

E) sp3

A

E) sp3

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13
Q

Which of the following molecules has the smallest dipole moment?

A) Br2

B) NH3

C) HCl

D) HBr

E) HI

A

A) Br2

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14
Q

Identify the hybridization of carbon in H2CO.

A) sp

B) sp2

C) sp3

D) sp4

E) s3p

A

B) sp2

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15
Q

The N-H single bond in methyl amine (CH3NH2) is a ________ bond formed by the overlap of a(n) ________ orbital on N and a(n) ________ orbital on H.

A) σ; sp2; s

B) σ ; sp3; s

C) π ; sp3; s

D) π ; sp2; p

E) π ; p ; p

A

B) σ ; sp3; s

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16
Q
A

A

17
Q

How many distinct and degenerate p orbitals exist in the second electron shell, where n = 2?

A) 0

B) 1

C) 2

D) 3

E) 4

A

D) 3

18
Q

The lone-pair electrons of the methyl anion occupy a(n) ________ orbital.

A) s

B) p

C) sp

D) sp2

E) sp3

A

E) sp3

19
Q

What is the predicted shape, bond angle, and hybridization for +CH3?

A) trigonal planar, 120°, sp2

B) trigonal planar, 120°, sp3

C) trigonal planar, 109.5°, sp2

D) trigonal pyramidal, 120°, sp2

E) trigonal pyramidal, 109.5°, sp2

A

A) trigonal planar, 120°, sp2

20
Q

Give the shape of the methyl radical.

A) trigonal pyramidal

B) tetrahedral

C) bent

D) linear

E) trigonal planar

A

E) trigonal planar

21
Q
A

E) bond 5

22
Q

A molecule of acetonitrile CH3CN contains ________ sigma bonds and ________ pi bonds.

A) 5, 2

B) 4,3

C) 4,2

D) 2,2

E) 4,0

A

A) 5, 2

23
Q
A

B

24
Q
A

D) ~ 120˚

25
Q

How many sp2 hybridized carbons are present in allene (H2C=C=CH2)?

A) 0

B) 1

C) 1.5

D) 2

E) 3

A

D) 2

26
Q

What orbitals overlap to create the C-H bond in ethene (H2C=CH2)?

A) s-sp

B) s-sp2

C) s-sp3

D) s-p

E) p-p

A

B) s-sp2

27
Q

Which of the following molecules does not exhibit a net dipole moment of zero?

A) CO2

B) CH4

C) CCl4

D) H2O

E) SO3

A

D) H2O

28
Q

Among the hydrogen halides, the strongest bond is found in ________ and the longest bond is found in ________.

A) HF, HF

B) HF, HI

C) HI, HF

D) HI, HI

E) HCl, HBr

A

B) HF, HI

29
Q
A

B) A, D, E and F

30
Q
A

D

31
Q

The hydrogen—halogen bond becomes ________ and ________ as the size (atomic weight) of the halogen increases.

A) longer, weaker

B) longer, stronger

C) shorter, weaker

D) shorter, stronger

A

A) longer, weaker

32
Q
A

B) 2

CHM 331 (9 decks)

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