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Chem. 120 A > VSEPR Theory > Flashcards

VSEPR Theory Flashcards

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1
Q

What is the goal of valence shell electron pair repulsion theory?

A
  • The central atom determines the geometry

- Space out electron pairs to lower energy

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2
Q

What are electron groups?

A
  • Electron pairs

- Electron bonds

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3
Q

What are the molecules that form with 2 electron groups?

A
  • 0 lone pairs
  • Electron geometry of is linear
  • Molecular geometry is linear
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4
Q

What are the molecules that form with 3 electron group?

A
  • 3 bonds

- 2 bonds and 1 lone pair

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5
Q

What is molecular geometry?

A
  • How the molecule looks in space

- Ignores the lone pairs

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6
Q

What is electron geometry?

A

-Counts all electron groups including lone pairs

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7
Q

What is the electron geometry, molecular geometry, and degrees of 3 bonds?

A
  • e- geo. = Trigonal planar
  • mole. geo. = Trigonal planar
  • degree = 120
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8
Q

What is the electron geometry, molecular geometry, and degrees of 2 bonds and one lone pair?

A
  • e- geo. =Trigonal planar
  • mole. geo. = Bent
  • <120
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9
Q

What are the molecules that form with 4 electron group?

A
  • 4 bonds
  • 3 bonds and 1 lone pair
  • 2 bonds and 2 lone pair
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10
Q

What is the electron geometry, molecular geometry, and degrees of 4 bonds?

A
  • e- geo. = Tetrahedral
  • mole. geo. = Tetrahedral
  • degrees = 109.5
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11
Q

What is the electron geometry, molecular geometry, and degrees of 3 bonds and 1 lone pair?

A
  • e- geo. = Tetrahedral
  • mole. geo. = Trigonal pyramidal
  • <109.5
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12
Q

What is the electron geometry, molecular geometry, and degrees of 2 bonds and 2 lone pair?

A
  • e. geo. = Tetrahedral
  • mole geo = bent
  • <109.5
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13
Q

What are the molecules that form with 5 electron group?

A
  • 5 bonds
  • 4 bonds and 1 lone pair
  • 3 bonds and 2 lone pair
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14
Q

What is the electron geometry, molecular geometry, and degrees of 5 bonds?

A
  • e. geo. = Trigonal bipyramidal
  • mole geo. = Trigonal bipyramidal
  • 120 (equatorial)
  • 90 (axial)
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15
Q

What are the molecules that form with 6 electron group?

A
  • 6 bonds
  • 5 bonds and 1 lone pair
  • 4 bonds and 2 lone pair
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16
Q

What is the electron geometry, molecular geometry, and degrees of 6 bonds?

A
  • e- geo. = Octahedral
  • mole. geo. = Octahedral
  • 90
17
Q

What is the electron geometry, molecular geometry, and degrees of 5 bonds and 1 lone pair?

A

-e- geo. = Octahedral
-mole. geo. = Square pyramidal
<90

18
Q

What is the electron geometry, molecular geometry, and degrees of 4 bonds and 2 lone pair?

A
  • e- geo. = Octahedral
  • mole. geo. = square planar
  • 90
19
Q

What is the electron geometry, molecular geometry, and degrees of 4 bonds and one lone pair?

A

-e- geo. = Trigonal bipyramidal
-mole geo. = Seesaw
<90 (axial)

20
Q

What is the electron geometry, molecular geometry, and degrees of 3 bonds and 2 lone pair?

A

-e- geo. = Trigonal bipyramidal
- mole geo. = T-shaped
<90

21
Q

What is the electron geometry, molecular geometry, and degrees of 2 bonds and 3 lone pair?

A
  • e- geo. = Trigonal bipyramidal
  • mole geo. = Linear
  • 180
22
Q

What is a rule of thumb for molecules with 5 electron groups?

A

-Lone pair are not placed on the axial position.

23
Q

What is the electron geometry, molecular geometry, and degrees of 2 bonds and 3 lone pair?

A

e- geo. = Trigonal bipyramidal
- mole geo. =Linear
180

Chem. 120 A (11 decks)

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