Multiple Choice
Which of the following is good evidence that an unknown sample is a pure substance?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following best describes a heterogeneous mixture?
A
A container with pure distilled water.
B
A container with oxygen gas.
C
A container with sand and water, where the sand settles at the bottom.
D
A container with salt completely dissolved in water.
Verified step by step guidance1
Understand the definition of a heterogeneous mixture: it is a mixture where the components are not uniformly distributed and can be physically distinguished from one another.
Analyze each option to see if the components are uniformly mixed or if they separate visibly:
- Pure distilled water is a pure substance, not a mixture.
- Oxygen gas is also a pure substance, not a mixture.
- Salt completely dissolved in water forms a homogeneous mixture (a solution) because the salt ions are evenly distributed and not visible separately.
- Sand and water form a heterogeneous mixture because the sand particles do not dissolve and settle at the bottom, making the mixture visibly non-uniform.
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