Electronegativity and bond polarityEdexcel International A Level Chemistry: Mind map

Exam questions on Electronegativity and bond polarity

1. Pauling electronegativity values: H 2.20, C 2.55, Cl 3.16, F 3.98 and Na 0.93.
   Explain, using the data, why sodium chloride is ionic whereas hydrogen chloride is polar covalent.2 marks
2. Pauling electronegativity values: H 2.20, C 2.55, O 3.44 and Cl 3.16. Carbon dioxide is a linear molecule (O=C=O), water is a bent (V-shaped) molecule, and chloromethane, CH₃Cl, methane, CH₄, and tetrachloromethane, CCl₄, are all tetrahedral.
   Explain why water is a polar molecule.2 marks
3. Pauling electronegativity values: H 2.20, F 3.98, Cl 3.16, I 2.66, Na 0.93 and Si 1.90.
   Calculate the electronegativity difference in H–F, H–Cl and H–I. State which bond is the most polar and the direction of the dipole in that bond.3 marks