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The differences in the properties of two substances in a mixture can be used to separate a substance out of the mixture.

What two differences in the properties of oil and water are used when oil is skimmed or poured off the top of a mixture of oil and water?
A.
solubility and density
B.
magnetism and boiling point
C.
particle size and color
D.
boiling point and density

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Answer:

A. Solubility and density.

Step-by-step explanation:

The oil is insoluble in water, so the liquids form two layers.

The oil is less dense than water, so it floats on top of the water, where you can skim it off.

B, C, and D are wrong. If you are skimming off the oil, you aren’t using its magnetism, boiling point, particle size, or colour for the separation.  

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