Oil and water placed in a jar will separate. Even when shaken and mixed, the oil still separates from the water. Which best describes oil and water?

Oil and water separate because they do not dissolve well in each other, so they have low solubility. Their different chemical properties—especially water’s polarity and oil’s nonpolar nature—keep them from mixing. Different pressures do not explain why they separate. The best choice is “Oil and water have a low solubility because they have separate chemical properties.”

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