試題詳解

20. Which of the following statements is correct?
(A) In volatilization gravimetry, the analyte is separated from other constituents of a sample by converting it to a precipitate of known chemical composition.
(B) In precipitation gravimetry, the product should be of sufficiently low solubility and reactive with constituents of the atmosphere.
(C) A colloid consists of solid particles from 10-2 to 10-6 m in diameter that are visible to the naked eyes.
(D) Nucleation is a process in which a maximum number of atoms, ions, or molecules join together to give a small number of larger particles.

(E) When a precipitate is formed at high relative supersaturation, nucleation is the major precipitation mechanism.