What is non-polar in chemistry

Polar and non-polar molecules

Polar molecules have an imbalance in terms of the distribution of binding electrons. The atom with the greater electronegativity attracts the binding electrons more strongly. The negative pole arises there. The positive pole is then at the opposite end. One speaks of a polar atomic bond. The most important example: the water molecule
Other polar substances: substances with an OH group (= hydroxyl group), substances with a COOH group (= carboxyl group), substances with an NH2-Group (= amino group). Since these substances can be dissolved very easily in water, they are called hydrophilic.  Non-polar molecules contain elements with approximately the same electronegativity, there is no significant shift of electrons in the bond.
There is no polarity in such hydrocarbon chains. Non-polar substances can be dissolved in non-polar solvents. They react repellent to water, that is hydrophobic. This subheading includes oils, fats and alkanes. But there are also substances with a hydrophilic part and a hydrophobic part, such as ethanol (alcohol).
Ethanol is therefore readily soluble in water, but it can also dissolve fat.  Work on the questions and open: OpenOffice file or PDF