Multiple Choice
Which of the following best explains whether a compound is considered a pure substance?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is a heterogeneous mixture?
A
Sugar dissolved in water
B
Salad dressing (oil and vinegar)
C
Air
D
Table salt (NaCl)
Verified step by step guidance1
Understand the definition of a heterogeneous mixture: it is a mixture where the components are not uniformly distributed and you can often see different parts or phases.
Examine each option to determine if the mixture is uniform (homogeneous) or non-uniform (heterogeneous):
Sugar dissolved in water forms a solution where sugar molecules are evenly distributed, making it a homogeneous mixture.
Air is a mixture of gases that are uniformly mixed, so it is also homogeneous.
Table salt (NaCl) is a pure compound, not a mixture, so it cannot be heterogeneous.
Salad dressing (oil and vinegar) consists of two liquids that do not mix uniformly, creating visible layers or droplets, which makes it a heterogeneous mixture.
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