Neco 2017 Chemistry Question 3

Practice essay / theory question 3 from the 2017 Neco Chemistry examination. This question covers Chemical Bonding .

Neco 2017 Chemistry Essay / Theory
Topic: Chemical Bonding
Question 3 NECO • 2017 • CHEMISTRY • essay

Answer the following questions on chemical bonding.

Question Parts

( a )
Draw the Lewis structure of sulfur tetrafluoride (SF₄). Explain why sulfur can accommodate more than an octet of electrons.
( b )
Using VSEPR theory, predict the molecular geometry of SF₄ and give the approximate bond angles between bonded atoms.
( c )
The average bond dissociation energies are: C–C single bond = 347 kJ mol⁻¹, C=C double bond = 614 kJ mol⁻¹. Explain, with reference to bond order and electron sharing, why the double bond is stronger and how this influences the reactivity of alkenes compared with alkanes.
( d )
Given electronegativities: S = 2.58, F = 3.98. Determine the polarity of the S–F bond and state the direction of the molecular dipole moment of SF₄. Justify your answer based on the geometry obtained in part (b).

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About This Question

This is Neco 2017 Chemistry Question 3. It is one of the essay questions from the 2017 Neco Chemistry examination.

The question covers Chemical Bonding .

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