Question #838b2

1 Answer
Suren Abreu
Oct 14, 2016

There are two reasons. The difference in densities and the difference in molecular polarity.

Explanation:

Oil being less dense than water, when the two are mixed, oil floats above water.

Oil being non-polar and water being polar (with two hydrogen molecules and one oxygen molecules), they tend to stick to their own kind (oil-oil and water-water) preferentially and repel each other.

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