CBSE Class 12-science Answered
Molecules can be grouped as polar or non-polar molecules. Some are also in between.
The arrangement or geometry of the atoms in some molecules is such that one end of the molecule has a positive electrical charge and the other side has a negative charge. If this is the case, the molecule is called a polar molecule, meaning that it has electrical poles. Otherwise, it is called a non-polar molecule.
Examples of polar molecules of materials that are gases under standard conditions are:
- Ammonia (NH3)
- Sulfur Dioxide (SO2)
- Hydrogen Sulfide (H2S).
Also, Ethanol is polar, since its oxygen molecule draws electrons towards it due to its high electro-negativity, causing a negative charge around itself. Water is also an example of polar molecule.
Most hydrocarbon liquids are non-polar molecules.
Examples of non polar molecules include:
- Hydrogen (H2)
- Nitrogen (N2)
- Oxygen (O2)
- Carbon Dioxide (CO2)
- Methane (CH4)
- Ethylene (C2H4)
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