1a3 marks
Dot and cross diagrams are used to show the arrangement of outer electrons in covalently bonded molecules.
Draw diagrams for the following molecules:
i)
Hydrogen cyanide.
[1]
ii)
Carbon dioxide.
[1]
iii)
Boron trifluoride.
[1]
1b2 marks
Using your answer to part (a), identify the species that is likely to form a coordinate bond. Explain your answer.
1c2 marks
i)
Draw a dot-and-cross diagram for the product of boron trifluoride and ammonia.
[1]
ii)
Explain how the bond forms between the boron trifluoride and ammonia molecules.
[1]
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