Polar substances dissolve in water while non polar substances do not dissolve in water.
Water has polar O - H bonds hence it must be a polar molecule. Polar molecules are molecules that have unsymmetrical electron distribution between atoms in a bond.
Substances that dissolve in water are polar substances. The following substances dissolve in water;
- salt
- rubbing alcohol
- vinegar
Hence, these substances are polar.
The following substances do not dissolve in water hence they are nonpolar;
- iodine solution
- vegetable oil
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