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Grade 12 Chemistry > Molecular Shape and VSEPR > Flashcards

Molecular Shape and VSEPR Flashcards

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1
Q

What is VSEPR theory?

A
  1. Effective in predicting the shapes of molecules.
  2. Focuses on pairs of electrons in the valence shell of the central atom.
  3. Based on the idea that valence shell electron pairs repel each other.
  4. Electron pairs assume orientations to minimize repulsions.
  5. The force of repulsion between two electron pairs is much greater at an angle of 90degrees than 120 or 180.
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2
Q

Order the amount of repulsion of Lone pairs and bonding pairs from strongest to weakest.

A

LP-LP, LP-BP, BP-BP

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3
Q

What does VSEPR stand for?

A

Valence shell electron pair repulsion theory.

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4
Q

What is VSEPR notation?

A

AXnEm (where A is central atom, X is atoms bonded to central atom, E is lone electron pairs)

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5
Q

What are the 4 steps for predicting Molecular Shape?

A
  1. Draw the Lewis structure of the molecule.
  2. Determine the total number of electron pairs around the central atom.
  3. Determine the geometric arrangement based on the number of electron pairs.
  4. Determine the molecular shape from the position occupied by the bond pairs and lone pairs.
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6
Q

What is the electronic geometry of AX2 molecules?

A

Linear

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7
Q

What is the electronic geometry of AX3 molecules?

A

Trigonal Planar

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8
Q

What is the electronic geometry of AX4 molecules?

A

Tetrahedral

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9
Q

What is the electronic geometry of AX5 molecules?

A

Trigonal bipyramidal

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10
Q

What is the electronic geometry of AX6 molecules?

A

Octahedral

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11
Q

What is the molecular shape/geometry distribution of AX2E1?

A

Bent

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12
Q

What are the bond angles of AX2 linear molecule?

A

180 degrees

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13
Q

What is the molecular shape/geometry distribution of AX3E1?

A

Trigonal pyramidal

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14
Q

What is the molecular shape/geometry distribution of AX2E2?

A

Bent

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15
Q

What is the molecular shape/geometry distribution of AX4E1?

A

see-saw

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16
Q

What is the molecular shape/geometry distribution of AX3E2?

A

T-shaped

17
Q

What is the molecular shape/geometry distribution of AX2E3?

A

Linear

18
Q

What is the molecular shape/geometry distribution of AX5E1?

A

Square pyramidal

19
Q

What is the molecular shape/geometry distribution of AX4E2?

A

Square planar

20
Q

What are the possible molecular shapes of 2?

A

linear

21
Q

What are the possible molecular shapes of 3?

A

Trigonal planar, bent

22
Q

What are the possible molecular shapes of 4?

A

Tetrahedral, Trigonal pyramidal, bent

23
Q

What are the possible molecular shapes of 5?

A

Trigonal Bipyramidal, see-saw, T-shaped, linear

24
Q

What are the possible molecular shapes of 6?

A

Octahedral, square pyramidal, square planar

25
Q

What are the bond angles of trigonal planar molecules?

A

AX3 is 120

AX2E1 is less than 120

26
Q

What are the bond angles of tetrahedral molecules?

A

AX4 is 109.5
AX3E1 is 107
AX2E2 is 104.5

27
Q

What are the bond angles of trigonal bipyrimidal molecules?

A

They are all 120/90 (120 is equatorial, 90 is axial) except AX2E3 (180)

28
Q

What are the bond angles of octahedral molecules?

A

90

29
Q

What shape is CO2?

A

Linear (AX2)

30
Q

What shape is BF3?

A

Trigonal planar

31
Q

What shape is CH4?

A

Tetrahedral AX4

32
Q

WHat shape is NH3?

A

Trigonal pyramidal AX3E1

33
Q

What shape is H2O?

A

Bent AX2E2

34
Q

What shape is PF5?

A

Trigonal bipyramidal AX5

35
Q

What shape is SF4?

A

See-saw AX4E1

36
Q

What shape is ClF3?

A

T-shaped AX3E2

37
Q

What shape is SF6?

A

Octahedral AX6

38
Q

What shape is IF5?

A

Square pyramidal AX5E1

39
Q

What shape is XeF4?

A

Square planar AX4E2

Grade 12 Chemistry (8 decks)

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