Discussion
Consider the following statements comparing silver iodide and dry ice.
1. Silver iodide nucleates ice by resembling the ice lattice.
2. Dry ice works by intense local cooling instead.
3. Both agents leave a chemical residue in the cloud.
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 give the two mechanisms correctly: silver iodide has a crystal structure close enough to ice to act as a template, while dry ice at −78 degrees chills the air around it so sharply that ice forms spontaneously. Statement 3 is wrong for the dry ice, which sublimes to carbon dioxide and leaves nothing behind.
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