Neco 2024 Chemistry Question 3

Practice essay / theory question 3 from the 2024 Neco Chemistry examination. This question covers Chemical Bonding .

Neco 2024 Chemistry Essay / Theory

Topic: Chemical Bonding

Question 3 NECO • 2024 • CHEMISTRY • essay

Element A has an electronegativity of 2.1 and forms a compound AB₂ in which the central atom A is surrounded by two identical atoms B each having an electronegativity of 3.0. The compound adopts a trigonal planar arrangement around A. Using this information:

Question Parts

( a )

State the type of bond that exists between A and B and justify your answer.

( b )

Calculate the percent ionic character of the A–B bond using the formula \( \%IC = (1 - e^{-0.25(\Delta\chi)^2}) \times 100 \). Give your answer to one decimal place.

( c )

Explain why AB₂ is expected to have a higher boiling point than a comparable compound in which the electronegativity difference between the central atom and its ligands is only 0.4.

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About This Question

This is Neco 2024 Chemistry Question 3. It is one of the essay questions from the 2024 Neco Chemistry examination.

The question covers Chemical Bonding .

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