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Advanced Higher Chemistry: Unit 1- Inorganic And Physical Chemistry > VESPR theory > Flashcards

VESPR theory Flashcards

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1
Q

What does VESPR stand for?

A 
Valence 
Shell 
Electron
Pair 
Repulsion
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2
Q

What is the VESPR theory used to do?

A

Predict the shape of polyatomic molecules

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3
Q

What does the theory assume?

A

That electron pairs within atoms will arrange themselves as far apart as possible in order to minimise repulsion.

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4
Q

What will the groups of atoms take up?

A

BASIC shapes according to the specific numbers of electron pairs (numbers of atoms attached)

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5
Q

For 2 electron pairs, what would the basic shape be?

A

Linear

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6
Q

For 3 electron pairs, what would the basic shape be?

A

Trigonal planar

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7
Q

For 4 electron pairs, what would the basic shape be?

A

Tetrahedral

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8
Q

For 5 electron pairs, what would the basic shape be?

A

Trigonal bipyramidal

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9
Q

For 6 electron pairs, what would the basic shape be?

A

Octahedral

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10
Q

What is the bond angle for a linear shape?

A

180

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11
Q

What is the bond angle for a trigonal planar shape?

A

120

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12
Q

What is the bond angle for a tetrahedral shape?

A

109.5

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13
Q

What are the bond angles for a trigonal bipyramidal shape?

A

90

120

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14
Q

What is the bond angle for a octahedral shape?

A

90

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15
Q

What equation is used to calculate the number of electron pairs?

A

No of outer electrons on central atom+ no of electrons donated by bonded atoms /2

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16
Q

What will the presence of non-bonding pairs do?

A

Distort the basic shape

17
Q

Why does the presence of non-bonding distort the basic shape?

A

As the repulsion is greater between a non-bonding and a bonding pair

18
Q

What will repulsion from non-bonding pairs do?

A

Reduced the bond angles to less than it would be in the basic shape

19
Q

For a positive ion, what would you do to alter the question?

A

Subtract 1

20
Q

For a negative ion, what would you do to alter the question?

A

Add 1

Advanced Higher Chemistry: Unit 1- Inorganic And Physical Chemistry (12 decks)

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