Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Adv Inorg > Molecular Symmetry & Point groups > Flashcards

Molecular Symmetry & Point groups Flashcards

1
Q

What is symmetry?

A

Symmetry is a property of molecules containing more than one atom of the same kind, with equal
bond lengths and/or bond angles.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

True or False: Symmetry in molecules can affect their physical and chemical properties.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a point group?

A

A set of symmetry operations that describe the symmetry of a molecule.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Fill in the blank: The simplest point group is ______.

A

C1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What does the ‘C’ in ‘Cn’ point groups represent?

A

Rotation axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

List the types of symmetry operations in molecular symmetry.

A

Rotation, reflection, inversion, improper rotation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the significance of the principal axis in point groups?

A

It is the axis with the highest order of rotation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Multiple choice: Which of the following is a point group? A) C2v B) C3h C) D4d D) All of the above

A

D) All of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is an improper rotation?

A

A rotation followed by a reflection through a plane perpendicular to the rotation axis.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

True or False: A molecule with no symmetry elements belongs to the point group C1.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the symmetry element for a mirror plane?

A

Reflection plane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Fill in the blank: The point group Dnh is characterized by ______.

A

A principal rotation axis and n vertical mirror planes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the role of symmetry in spectroscopy?

A

It helps predict the selection rules for transitions.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Multiple choice: Which point group has only one symmetry element? A) C1 B) C2 C) D2h D) C∞v

A

A) C1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does the ‘h’ in ‘Dnh’ indicate?

A

Presence of horizontal mirror plane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the relationship between symmetry and chirality?

A

Chiral molecules lack symmetry elements that relate them to their mirror images.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

True or False: All molecules with a center of inversion are achiral.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the character table used for?

A

It summarizes the symmetry properties of a point group.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Fill in the blank: The point group C∞v is associated with ______.

A

Linear molecules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is the effect of symmetry on molecular vibrations?

A

Symmetry determines the number of active vibrations and their selection rules.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Multiple choice: Which of the following molecules belongs to the point group D2h? A) H2O B) CO2 C) NH3 D) CH4

A

B) CO2

22
Q

What is a symmetry operation?

A

An action that moves a molecule into an equivalent configuration.

23
Q

True or False: The identity operation is always a part of every point group.

A

True

24
Q

What is the significance of the order of a point group?

A

It indicates the number of symmetry operations in the group.

25
Q

Fill in the blank: A molecule with a single C3 axis and three vertical planes belongs to the point group ______.

A

C3v

26
Q

What is a point group in inorganic chemistry?

A

A point group is a set of symmetry operations that leave at least one point in the molecule unchanged.

27
Q

True or False: All molecules belong to a point group.

A

True

28
Q

Which point group does a molecule with a C2 rotational axis and two vertical planes of symmetry belong to?

A

C2v

29
Q

Fill in the blank: The point group for a linear molecule like carbon dioxide (CO2) is ____.

A

D∞h

30
Q

What symmetry operation is represented by the symbol ‘σ’?

A

Reflection

31
Q

Identify the point group for a tetrahedral molecule.

A

T

32
Q

Which point group is associated with molecules that have a center of inversion?

A

i

33
Q

True or False: The point group C3 has three symmetry operations.

A

False

34
Q

What is the point group of ammonia (NH3)?

A

C3v

35
Q

Which point group does benzene (C6H6) belong to?

A

D6h

36
Q

Multiple Choice: Which of the following molecules belongs to the point group C2h? A) H2O B) NH3 C) Ethylene D) Cyclobutane

A

C) Ethylene

37
Q

What type of symmetry operation is a ‘C3’ rotation?

A

Rotation by 120 degrees around an axis

38
Q

Fill in the blank: The point group for a square planar molecule like xenon tetrafluoride (XeF4) is ____.

A

D4h

39
Q

What is the highest order of rotation in the point group C4?

A

4

40
Q

Which point group does a molecule with only a vertical mirror plane and no rotational symmetry belong to?

A

C1

41
Q

True or False: The point group Dnh has n-fold rotational symmetry and horizontal symmetry.

A

True

42
Q

Identify the point group for a molecule with a single C4 axis and four vertical planes of symmetry.

A

D4

43
Q

What is the point group of water (H2O)?

A

C2v

44
Q

Multiple Choice: Which point group does a molecule with a C2 axis and two perpendicular planes belong to? A) C2 B) D2 C) C2h D) C2v

A

B) D2

45
Q

Fill in the blank: A molecule with no symmetry operations belongs to the point group ____.

A

C1

46
Q

What is the point group of a molecule that has a center of inversion and a C2 axis?

A

D2h

47
Q

Which point group is characterized by having only rotational symmetry and no mirror planes?

A

Cn

48
Q

True or False: The point group C∞v is used to describe planar molecules.

A

False

49
Q

What is the point group of methane (CH4)?

A

T

50
Q

Identify the point group for a molecule that has both a C3 axis and three vertical mirror planes.

A

C3v

51
Q

Multiple Choice: Which point group has only one symmetry element? A) C1 B) Cs C) C2 D) D2

A

A) C1

Adv Inorg (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions