Multiple Choice
Which of the following substances is a mixture?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is NOT an example of a heterogeneous mixture?
A
Sand and water
B
Air
C
Oil and vinegar
D
Salad
Verified step by step guidance1
Step 1: Understand the definition of a heterogeneous mixture. A heterogeneous mixture is one in which the components are not uniformly distributed, and you can usually see different parts or phases.
Step 2: Analyze each option to determine if it is heterogeneous. Sand and water form a heterogeneous mixture because sand particles do not dissolve and settle separately from water.
Step 3: Oil and vinegar form a heterogeneous mixture because oil and vinegar do not mix uniformly and separate into layers.
Step 4: Salad is a heterogeneous mixture because it consists of visibly different components like lettuce, tomatoes, and dressing that are not uniformly distributed.
Step 5: Air is a homogeneous mixture because it is a uniform mixture of gases (mainly nitrogen, oxygen, and other gases) that are evenly distributed and not visibly separable.
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