Multiple Choice
Which of the following best describes the difference between elements and compounds?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following pairs would most likely form a homogeneous mixture?
A
Ethanol and water
B
Oil and water
C
Sand and iron filings
D
Salt and pepper
Verified step by step guidance1
Understand the definition of a homogeneous mixture: it is a mixture where the components are uniformly distributed and indistinguishable from one another.
Analyze each pair to determine if they mix uniformly at the molecular level:
Ethanol and water are both polar substances and can mix in any proportion, forming a uniform solution, which is a homogeneous mixture.
Oil and water do not mix well because oil is nonpolar and water is polar, leading to phase separation, so this is a heterogeneous mixture.
Sand and iron filings, as well as salt and pepper, are mixtures of solid particles that do not dissolve or mix uniformly, resulting in heterogeneous mixtures.
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