High School

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When a homemade oil-and-vinegar salad dressing is left standing, it separates into layers. The salad dressing is a

A. solution
B. suspension
C. colloid
D. compound

Answer :

Final answer:

A homemade oil-and-vinegar salad dressing that separates into layers when left standing is a suspension. This is because a suspension is a heterogeneous mixture with large enough particles to settle out and form layers. The correct answer is option b) suspension.

Explanation:

When a homemade oil-and-vinegar salad dressing is left standing and it separates into layers, it can be classified as a b. suspension. A suspension is a heterogeneous mixture that contains solid particles that are sufficiently large for sedimentation. This means the particles are big enough to settle out and form layers, just as in a homemade oil-and-vinegar salad dressing. This is different to a solution, colloid, or compound.

A solution is a homogeneous mixture where the substances are uniformly spread out and do not settle, a colloid also does not settle but its particles are intermediate in size between those in solutions and suspensions, and a compound is a pure substance composed of two or more different atoms chemically bonded together.

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