Neco 2019 Chemistry Question 3

Practice essay / theory question 3 from the 2019 Neco Chemistry examination. This question covers Chemical Bonding .

Neco 2019 Chemistry Essay / Theory

Topic: Chemical Bonding

Question 3 NECO • 2019 • CHEMISTRY • essay

The table below gives the electronegativity values of selected elements and three compounds. Electronegativity (Pauling scale): Na = 0.9, Cl = 3.0, C = 2.5, O = 3.5, B = 2.0, F = 4.0. Compounds: (i) NaCl, (ii) CO2, (iii) BF3. Answer the following questions.

Question Parts

( a )

Using the electronegativity difference criterion, state the type of chemical bond (ionic, non‑polar covalent, polar covalent) present in each of the three compounds.

( b )

For the compound BF3:

( ) Draw the correct Lewis structure showing all valence electrons.

( ) Using VSEPR theory, predict the molecular geometry and give the approximate bond angle.

( c )

Explain, with reference to the type of bonding and structure, why the melting point of NaCl is much higher than that of CO2.

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About This Question

This is Neco 2019 Chemistry Question 3. It is one of the essay questions from the 2019 Neco Chemistry examination.

The question covers Chemical Bonding .

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