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Flashcards in Chapter 2 Deck (30):
1

An orbital can be described by its ________, which is the mathematical description of the shape of the electron wave as it oscillates.

Answer: wave function

2

The electron density at any point is proportional to the ________ of the electron wave at that point.

Answer: square of the wave function

3

Two p orbitals can overlap to form a s molecular orbital. How many nodes are present in this s molecular orbital?
A) 0
B) 1
C) 2
D) 3

C) 2

4

Two p orbitals can overlap to form a s* molecular orbital. How many nodes are present in this s* molecular orbital?
A) 0
B) 1
C) 2
D) 3

D) 3

5

When orbitals on different atoms interact, ________ are produced.

Answer: molecular orbitals

6

Consider the interaction of two hydrogen 1s atomic orbitals of the same phase. Which of the statements below is an incorrect description of this interaction?
A) A sigma bonding molecular orbital is formed.
B) The molecular orbital formed is lower in energy than a hydrogen 1s atomic orbital.
C) The molecular orbital formed has a node between the atoms.
D) The molecular orbital formed is cylindrically symmetric.
E) A maximum of two electrons may occupy the molecular orbital formed.

C) The molecular orbital formed has a node between the atoms.

7

If a compound, C5H7NO, contains 1 ring, how many pi bonds are there in this compound?
A) 0
B) 1
C) 2
D) 3

C) 2

8

Which of the following statements about π molecular orbitals is/are correct?
A) π molecular orbitals are cylindrically symmetric.
B) Most of the electron density in a π molecular orbital is centered above and below the internuclear axis.
C) When two atoms are connected by a double bond, both of these bonds are π bonds.
D) Both statements B and C are correct.
E) Statements A, B, and C are all correct.

B) Most of the electron density in a π molecular orbital is centered above and below the internuclear axis.

9

Choose the term below which best describes the geometry of acetylene (HCCH).
A) trigonal bipyramidal
B) trigonal
C) tetrahedral
D) square planar
E) linear

E) linear

10

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°
D) sp3,

D) sp3,

11

Acrylonitrile (CH2=CHCN) contains ________ s bonds and ________ p bonds.
A) 4, 1
B) 6, 3
C) 4, 3
D) 6, 1
E) 2, 0

B) 6, 3

12

The CCN bond angle in acrylonitrile (CH2=CHCN) is approximately ________.
A) 60°
B) 90°
C) 109.5°
D) 120°
E) 180°

E) 180°

13

The HNC bond angle in the cation [CH2NH2]+ is approximately ________.
A) 60°
B) 90°
C) 109.5°
D) 120°
E) 180°

D) 120°

14

Boron trifluoride (BF3) is a molecule in which the boron atom is ________ hybridized and the FBF bond angle is ________.

Answer: sp2, 120°

15

A molecule of acetylene (C2H2) has a ________ geometry and a molecular dipole moment that is ________.
A) tetrahedral, nonzero
B) bent, nonzero
C) bent, zero
D) linear, nonzero
E) linear, zero

E) linear, zero

16

Which of the following statements is correct?
A) Higher molecular dipole values (μ) are associated with nonpolar molecules
B) All polar molecules are capable of hydrogen bond formation
C) The polarity of a molecule is dependent on its three-dimensional structure
D) Induced dipole interactions are usually stronger than dipole-dipole interactions
E) Polar solutes tend to be more soluble in nonpolar solvents

C) The polarity of a molecule is dependent on its three-dimensional structure

17

Which one of the molecules shown below has no net molecular dipole moment?
A) CH3Cl
B) H2CCH2
C) CH2O
D) CH2Cl2
E) CH3OH

B) H2CCH2

18

Which one of the molecules shown below has a net molecular dipole moment?
A) CCl4
B) CO2
C) CH3CCl3
D) BeCl2

C) CH3CCl3

19

What intermolecular forces are present among molecules in dimethyl ether, CH3OCH3?
A) London forces only
B) hydrogen bonding only
C) both London dispersion forces and hydrogen bonding
D) both London dispersion forces and dipole-dipole forces

D) both London dispersion forces and dipole-dipole forces

20

Which of the molecules below can hydrogen bond to another of the same compound?
A) CH3CH2OCH2CH3
B) CH3CH2COOCH3
C) (CH3CH2)2CHOH
D) CH3CH2COCH2CH3
E) all of the above

C) (CH3CH2)2CHOH

21

Which functional groups below indicate the presence of two atoms connected by a triple bond?
A) alkyne
B) alkene
C) nitrile
D) ester
E) both A and C

E) both A and C

22

What name is given to a hydrocarbon that contains a carbon-carbon triple bond?
A) alkane
B) alkene
C) alkyne
D) aromatic
E) none of the above

C) alkyne

23

Choose the functional group which is not represented in the structure of RU-486.
A) alkyne
B) alcohol
C) ketone
D) amine
E) ether

E) ether

24

Which of the molecules below is an ester?
A) CH3CH2CH(CH3)2
B) CH3OCH2CH2CH3
C) CH3COOH
D) CH3COOCH3
E) HC≡CCH3

D) CH3COOCH3

25

Which of the functional groups below contain a hydroxyl group as a part of their structure?
A) aldehyde
B) alcohol
C) carboxylic acid
D) amine
E) B and C only

E) B and C only

26

Which of the class of organic compound below contains a carbonyl group as a part of its structure?
A) aldehyde
B) ketone
C) carboxylic acid
D) ester
E) all of the above

E) all of the above

27

Which of the following does not contain a carbonyl group?
A) aldehyde
B) ketone
C) carboxylic acid
D) ester
E) ether

E) ether

28

Which of the following functional groups does not have at least one sp2 hybridized carbon atom as a constituent of the group?
A) carboxylic acid
B) alkene
C) aldehyde
D) ether
E) ester

D) ether

29

Which molecule below is an ether?
A) CH3CH2OCH2CH3
B) (CH3)2CHCH2OH
C) (CH3)2CHCH2NH2
D) (CH3)2C=CH2
E) CH3CH2CH2CO2H

A) CH3CH2OCH2CH3

30

Which of the molecules below can be properly called an amine?
A) CH3CN
B) CH3COOH
C) CH3CH2CH2OH
D) CH3CH2NHCH3
E) CH3CH2CH2NO2

D) CH3CH2NHCH3