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A2 Chem > Shape of molecules > Flashcards

Shape of molecules Flashcards

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1
Q

valance shell electron pair repulsion theory

A

shape depends on the number pf electrons around the central atom
each pair of electrons repel against other pairs so take up positions as far as apart as possible to minimise repulsion

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2
Q

do lone pairs or bond pairs have higher repulsion and why

A

lone pairs are higher in concentration so have greater repulsion as they are attracted to only one nucleus

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3
Q

how much does the angle decrease per lone pair

A

2.5 degrees

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4
Q

order of repulsion for lone pairs and bond pairs

A

lone pair-lone pair > lone pair-bond pair > bond pair-bond pair

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5
Q

shape and angle for:
2 bonding
0 lone

A

linear

180

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6
Q

shape and angle for:
3 bonding
0 lone

A

trigonal planar

120

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7
Q

shape and angle for:
2 bonding
1 lone

A

bent

118

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8
Q

shape and angle for:
4 bonding
0 lone

A

tetrahedral

109.5

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9
Q

shape and angle for:
3 bonding
1 lone

A

trigonal pyramid

107

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10
Q

shape and angle for:
2 bonding
2 lone

A

bent

104.5

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11
Q

shape and angle for:
5 bonding
0 lone

A

trigonal bipyramid

120 and 90

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12
Q

shape and angle for:
4 bonding
1 lone

A

see-saw

119 and 89

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13
Q

shape and angle for:
3 bonding
2 lone

A

trigonal planar 120

T-shape 89

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14
Q

shape and angle for:
6 bonding
0 lone

A

octahedral

90

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15
Q

shape and angle for:
5 bonding
1 lone

A

distorted square pyramid

89

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16
Q

shape and angle for:
4 bonding
2 lone

A

square planar

90

17
Q

how to explain shape

A

state number of bonding and lone pairs of electrons
- pairs of electrons repel against each other to positions of minimal repulsion
- if there are no lone pairs, the bonding pairs repel equally
- lone pairs repel more than bonding pairs
state actual shape and bonding angle

18
Q

some ion shapes cant be predicted

A

too many electrons in the d subshell

A2 Chem (5 decks)

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