Multiple Choice
In general chemistry, a solution is best described as an example of which type of mixture?
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6. Chemical Quantities & Aqueous Reactions
Solutions
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Topic: Solutions. Which of the following mixtures is NOT a solution?
A
Air (a mixture of gases)
B
Salt water (NaCl dissolved in water)
C
Sand in water
D
Brass (an alloy of copper and zinc)
Verified step by step guidance1
Understand the definition of a solution: A solution is a homogeneous mixture where the solute is uniformly distributed within the solvent at the molecular or ionic level.
Analyze each mixture to determine if it is homogeneous (a solution) or heterogeneous (not a solution):
Air is a homogeneous mixture of gases, so it qualifies as a solution.
Salt water is a homogeneous mixture where NaCl is dissolved uniformly in water, making it a solution.
Brass is a homogeneous solid mixture (an alloy) of copper and zinc, so it is also a solution.
Sand in water is a heterogeneous mixture because sand particles do not dissolve and remain suspended or settle, so it is NOT a solution.
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