Question

For each compound below, click in the box to toggle the direction of bond polarity (leave the box blank for a nonpolar bond).

Answer 1

Concepts and reason

Polar covalent bond is formed between the atoms with different electron negativities. Non-polar covalent bond will be formed between the atoms that have same electron negativities.

Identify the atoms involved in the bond, and also identify the more electronegativity atoms in the particular bond.

The difference in electron negativity between the atoms is the reason for the bond polarity. The bond polarity is represented by the symbol arrow mark $\to$ . The arrow is towards the more electronegative atom of the bond.

Fundamentals

A chemical bond that formed between atoms with unequal sharing of electrons leads to formation of positive and negative charges on the atoms. The phenomenon is called as bond polarity.

Halogens that are Group 7A elements of the periodic table are more electronegative in nature.

The molecule ${\rm{Br}} - {\rm{Br}}$ is having two similar atoms. The bonded electrons will be shared between these two atoms. The bond between ${\rm{Br}} - {\rm{Br}}$ is a non-polar in nature.

The molecule ${\rm{H}} - {\rm{Cl}}$ has two dissimilar atoms. Both the atoms have different electron negative values. The compound will be polar in nature.

The molecule ${\rm{F}} - {\rm{C}}{{\rm{H}}_3}$ has dissimilar atoms. The bond is formed between fluorine and carbon atoms. Both the fluorine and carbon atoms have different electron negative values. Fluorine is more electronegative than carbon. Thus, the bond will be polar in nature.

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