Chapter 12, Problem 7A

Interpretation Introduction

Interpretation:

The term used for bond ‘polar’ is to be discussed.

Concept introduction:

Electronegativity is the power of an atom to attract a shared pair of electrons.

It tells about the polarity of the bond.

Answer to Problem 7A

A bond is polar means it carriesa partial positive and negative charge.

If the electronegative difference between the atoms is intermediate, then the polar covalent bond is formed.

Explanation of Solution

A covalent bond is formed by the sharing of electrons between the atoms forming the bonds.

A polar covalent bond is formed between two different atoms.

A non-polar covalent bond is between the same two atoms.

Thus, the electronegative difference value depicts which type of bond is formed between two atoms.

For example:

The bond formed in ${\mathrm{H}}_2$ is a pure covalent bond and the bond formed in $\mathrm{H}\mathrm{C}\mathrm{l}$ is a polar covalent bond.

More electronegative atom acquires partially negative charge and less electronegative atom acquires a partial positive charge.

Conclusion

Thus, electronegative values are helpful in determining the polarity of the bond.