Multiple Choice
In the context of solutions and mixtures, which statement best describes the difference between a colloid and a true solution?
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6. Chemical Quantities & Aqueous Reactions
Solutions
Multiple Choice
Which of the following substances is NOT a solution (i.e., not a homogeneous mixture at the molecular or ionic level)?
A
Saltwater (aqueous )
B
Sand in water
C
Air (a mixture of gases such as and )
D
Brass (an alloy primarily of and )
Verified step by step guidance1
Understand the definition of a solution: a homogeneous mixture where the components are uniformly distributed at the molecular or ionic level.
Analyze saltwater (aqueous NaCl): NaCl dissolves in water to form ions (Na⁺ and Cl⁻) evenly dispersed, making it a true solution.
Consider air: it is a homogeneous mixture of gases like N₂ and O₂ uniformly mixed at the molecular level, so it is a solution.
Examine brass: an alloy of Cu and Zn where the metals are mixed uniformly at the atomic level, qualifying it as a solution (solid solution).
Look at sand in water: sand particles do not dissolve or disperse at the molecular level; they remain as separate solid particles suspended in water, making it a heterogeneous mixture, not a solution.
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