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AS Chemistry Chapter 3
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1 (a) F ­ 2 These shapes do not have lone pairs so
F
B F don't try and put them in.

F F B F

F 1

BF3 trigonal planar 1 BF4­ is a…

Page 2

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AS Chemistry Chapter 3
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examination-style
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(c) (i) van der Waals forces 1

ncrease with the increasing
i 1
molecular size / mass of the hydrogen
halides

(ii) h
ydrogen bonding stronger than van 1 Put the comparison in. Don't just…

Page 3

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AS Chemistry Chapter 3
Extension
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examination-style
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6 (a) SF6 shape is octahedral 1 Make sure you include the symbols for
bond angle = 90° 1 the elements in the diagram.
shape = 1
F

F F

S

F F
F

equal…

Page 4

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AS Chemistry Chapter 3
Extension
Answers to teacher notes questions
examination-style
Answers Marks Examiner's tips

(c) (i) 90° 1

(ii) l
one pairs repel more than bonding 1
pairs
so are as far apart as possible 1

(iii) square or square planar 1

(d) 2
N
F F
F

8…

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