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Chemistry > Shapes Of Molecules > Flashcards

Shapes Of Molecules Flashcards

1
Q

How to find the shape of a molecule

A

Find the central atom
Workout out how many electrons are in the outer shell of the central atom - same number as group on periodic table
Add 1 electron for every bonding atom - take charge into account if dealing with an ion
Add up all the electrons
Divide by 2
Compare the number of electrons pairs to the number of bonds to find out he number of lone pairs and the number of bonding pairs on the central atom

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2
Q

Linear

A

2 bonding pairs
No lone pairs
180

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3
Q

2 bonding pairs
0 lone pairs
180

A

Linear

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4
Q

BeCl

A

Linear
180

Cl-Be-Cl

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5
Q

Trigonal planar

A

3 bonding pairs
0 lone pairs
120

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6
Q

3 bonding pairs
0 lone pairs
120

A

Trigonal planar

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7
Q

BF3

A

Trigonal planar
120

F-B-F
|
F

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8
Q

Tetrahedral

A

4 bonding pairs
0 lone pairs
109.5

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9
Q

4 bonding pairs
0 lone pairs
109.5

A

Tetrahedral

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10
Q

NH4

A

Tetrahedral
109.5

      H
      |
      N
    /  |  \
   H H H
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11
Q

Trigonal pyramidal

A

3 bonding pairs
1 lone pair
107

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12
Q

3 bonding pairs
1 lone pair
107

A

Trigonal pyramidal

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13
Q

Bent

A

2 bonding pairs
2 lone pairs
104.5

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14
Q

2 bonding pairs
2 lone pairs
104.5

A

Bent

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15
Q

Trigonal bipyramidal

A

5 bonding pairs
0 lone pairs
90
120

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16
Q

5 bonding pairs
0 lone pairs
120
90

A

Trigonal bipyramidal

17
Q

Seesaw

A

4 bonding pairs
1 lone pair
86.5
102

18
Q

4 bonding pairs
1 lone pair
86.5
102

A

Seesaw

19
Q

T shape

A

3 bonding pairs
2 lone pairs
87.5

20
Q

3 bonding pairs
2 lone pairs
87.5

A

T shape

21
Q

Octahedral

A

6 bonding pairs
0 lone pairs
90

22
Q

6 bonding pairs
0 lone pairs
90

A

Octahedral

23
Q

Square pyramidal

A

5 bonding pairs
1 lone pair
90

24
Q

5 bonding pairs
1 lone pair
90

A

Square pyramidal

25
Q

Square planar

A

4 bonding pairs
2 lone pairs
90

26
Q

4 bonding pairs
2 lone pairs
90

A

Square planar

Chemistry (25 decks)

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