Discussion
Consider the following statements about the two models.
1. The shrinking core model suits a dense solid.
2. The progressive conversion model suits a very porous solid.
3. Both models predict a particle that shrinks in size.
Answer: B
The first two are correct. The third is wrong for the progressive conversion model, in which the particle keeps its size while its composition changes throughout. Porosity decides which applies. The two are the extremes of a range.
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