Chapter 4 2018/2019
Chapter 4 2018/2019
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a) Ammonia, NH3 and boron trifluoride, BF3 are covalent compounds. NH3 and BF3 react to form H3NBF3 molecule.
i. Explain why NH3 obeys the octet rule but BF3 does not.
[2 Marks]
ii. Show the formation of H3NBF3 molecule using Lewis dot symbol and label the bond formed .
[3 Marks]
b) Oxygen difluoride, OF2 is a strongly oxidising colourless gas.
i. Determine the molecular geometry of this molecule.
[5 Marks]
ii. Explain whether OF2 is a polar or non-polar molecule.
[3 Marks]
c) Aluminium and sodium are metals.
i. Explain the formation of metallic bond in sodium using the electron sea model.
[2 Marks]
ii. Why aluminium has higher boiling point than sodium.
[2 Marks]
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