5005 Praxis Practice Test Practice Question
A sample of a pure white substance in powdered form is added to a beaker of pure water. After the mixture is stirred for 5 minutes, a very small amount of the white substance is seen at the bottom of the beaker. Which of the following most likely explains the observation?
Correct Answer: B
Rationale: The observation of undissolved white substance at the bottom of the beaker suggests that the solution has reached its maximum capacity for dissolving that substance, indicating saturation.
Option A is incorrect because evaporation would not cause undissolved powder to remain; it would reduce the volume of water but not explain the observed residue.
Option C, while plausible, does not account for the possibility of saturation; some substances can dissolve to a limit before precipitation occurs.
Option D is not applicable here, as the scenario describes a physical process (dissolving) rather than a chemical change.
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