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MED 102- GENERAL CHEMISTRY > 10. VSEPR THEORY > Flashcards

10. VSEPR THEORY Flashcards

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1
Q
  1. What does VSEPR stand for?
A
  • the Valence Shell Electron Pair Repulsion Theory
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2
Q
  1. What does the VSEPR theory state?
A
  • it states that electron clouds/domains/regions repel each other due to their like negative forces
  • these electron domains should stay as far away as possible from one another
  • this makes molecules stable
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3
Q
  1. Why is the VSEPR theory helpful?
A
  • it helps us find the best possible shape for the molecule to be in
  • in order for it to be at its highest stability
  • it is useful for finding the geometry (shape) of the molecules
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4
Q
  1. What is the process of discovering the basic geometry (shape) of the molecules?
A
  1. Draw the correct Lewis Structure
  2. Find the number of regions of electron density on the
    central atom
    (these are the bonds or the lone pairs)
    NB: one region/electron cloud= a double, single, triple
    bond or lone pair
  3. This gives us the basic geometry (electron pair)
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5
Q
  1. How do you find the molecular shape of the molecule?
A
  • you look at the basic structure
  • you ignore the lone pairs
  • look at the bonds
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6
Q
  1. What is the electron domain geometry shape for the following number of electron domains?

6.1: two electron domains
6.2: three electron domains
6.3: four electron domains
6.4: five electron domains
6.5: six electron domains

A

6.1: linear
6.2: trigonal planar
6.3: tetrahedral
6.4: trigonal bipyramidal
6.5: octahedral

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7
Q
  1. What is the angle degree for the following number of electron domains?

7.1: two electron domains
7.2: three electron domains
7.3: four electron domains
7.4: five electron domains
7.5: six electron domains

A

7.1: 180°
7.2: 120°
7.3: 109.5°
7.4: 90° and 120°
7.5: 90°

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8
Q
  1. Give the name for this basic geometry molecular structure and the number of electron regions it has?
A
  • linear
  • 2 electron regions
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9
Q
  1. Give the name for this basic geometry molecular structure and the number of electron regions it has?
A
  • trigonal planar
  • 3 electron regions
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10
Q
  1. Give the name for this basic geometry molecular structure and the number of electron regions it has?
A
  • tetrahedral
  • 4 electron regions
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11
Q
  1. Give the name for this basic geometry molecular structure and the number of electron regions it has?
A
  • trigonal bipyramidal
  • 5 electron regions
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12
Q
  1. Give the name for this basic geometry molecular structure and the number of electron regions it has?
A
  • octahedral
  • 6 electron regions
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13
Q

13.1: What is the name of a trigonal planar shape with:
- one lone pair
- two electron bonds

13.2: What is the angle?

A
  • Bent/Angular
  • less than 120°
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14
Q

14.1: What is the name of a tetrahedral shape with:
- one lone pair
- three electron bonds

14.2: What is the angle?

A
  • Trigonal Pyramid
  • less than 109°
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15
Q

15.1: What is the name of a tetrahedral shape with:
- two lone pairs
- two electron bonds

15.2: What is the angle?

A
  • Bent/Angular
  • much less than 109°
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16
Q

16.1: What is the name of a trigonal bipyramid shape with:
- one lone pair
- four electron bonds

16.2: What is the angle?

A
  • Saw Horse/Seesaw
  • less than 90°
  • less than 120°
17
Q

17.1: What is the name of a trigonal bipyramid shape with:
- two lone pairs
- three electron bonds

17.2: What is the angle?

A
  • T-Shape
  • less than 90°
18
Q

18.1: What is the name of a trigonal bipyramid shape with:
- three lone pairs
- two electron bonds

18.2: What is the angle?

A
  • linear
  • 180°
19
Q

19.1: What is the name of a octahedral shape with:
- one lone pair
- five electron bonds

19.2: What is the angle?

A
  • square pyramid
  • less than 90°
20
Q

20.1: What is the name of a octahedral shape with:
- two lone pairs
- four electron bonds

20.2: What is the angle?

A
  • Square planar
  • 90°
21
Q

21.1: What is the name of a octahedral shape with:
- three lone pairs
- three electron bonds

21.2: What is the angle?

A
  • T-Shape
  • less than 90°
22
Q

21.1: What is the name of a octahedral shape with:
- three lone pairs
- three electron bonds

21.2: What is the angle?

A
  • T-Shape
  • less than 90°
23
Q

22.1: What is the name of a octahedral shape with:
- four lone pairs
- two electron bonds

22.2: What is the angle?

A
  • linear
  • 180°
24
Q
  1. List the 6 Non- Polar compounds.
A
  1. Linear (AB2)
  2. Trigonal Planar (AB3)
  3. Square Planar (AB4)
  4. Tetrahedral (AB4)
  5. Trigonal Bipyramidal (AB5)
  6. Octahedral (AB6)

NB: anything else must be polar

MED 102- GENERAL CHEMISTRY (27 decks)

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