A student mixes oil and water in a beaker and notices two separate layers. Which explanation best fits this observation?
Oil and water form a heterogeneous mixture because their components are not uniformly distributed
Water molecules are polar and form strong hydrogen bonds with one another, while oil molecules are non-polar hydrocarbons.
Because "like dissolves like", polar water and non-polar oil do not mix; the oil molecules cannot break into the water network and remain separate.
Oil is also less dense than water, so it floats on top, producing two visibly different layers with no chemical reaction between them.
Such a mixture has non-uniform composition throughout its volume, which is the definition of a heterogeneous mixture.
Hence, oil and water form a heterogeneous mixture because their components are not uniformly distributed.
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