Open Question
Why do fish die when placed in a tank filled with water that has been boiled and then cooled?
14. Solutions
Types of Aqueous Solutions
Multiple Choice
Which of the following best describes a colloid in an aqueous solution?
A
A solution in which the solute is insoluble and forms a separate layer.
B
A heterogeneous mixture in which large particles settle out upon standing.
C
A mixture in which particles are dispersed throughout the solvent and remain evenly distributed without settling, with particle sizes between 1 nm and 1000 nm.
D
A homogeneous mixture in which solute particles are completely dissolved and have particle sizes less than 1 nm.
Verified step by step guidance1
Understand the definition of a colloid: it is a mixture where particles are dispersed throughout a solvent but do not settle out over time.
Recognize that colloidal particles have sizes between 1 nm and 1000 nm, which is larger than typical dissolved molecules but smaller than particles in suspensions.
Distinguish colloids from solutions: solutions have particles smaller than 1 nm that are completely dissolved and homogeneous.
Distinguish colloids from suspensions: suspensions have larger particles that are heterogeneous and settle out upon standing.
Conclude that the best description of a colloid in an aqueous solution is a mixture with dispersed particles sized between 1 nm and 1000 nm that remain evenly distributed without settling.
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