Chapter U2.42, Problem 1E

Interpretation Introduction

Interpretation : A polar molecule is to be explained.

Concept Introduction : A polar molecule is a molecule that possesses partial charges on its atoms. There is a partial positive and a partial negative charge on atoms. This is due to the difference in electronegativity of atoms forming the bond. A polar molecule is formed when there is a positive charge on one side of the molecule due to spatial arrangement of chemical bonds.

Explanation of Solution

When a charged wand is brought near a liquid like water, it attracts the stream of water. This is due to polarity in water molecules. The water molecules have slight negative charge on oxygen atom and slight positive charge on hydrogen atoms. Due to this, the hydrogen atoms orient themselves towards the negatively charged wand and the whole stream of water gets attracted towards the wand. Here, water is a polar molecule.

Hence, a polar molecule is one which has a partial positive charge on one side and partial negative charge on other side of the molecule. This is due to difference in electronegativity of atoms.

Some liquids are polarin nature such as water, vinegar, rubbing alcohol, etc.