Detailed Instructions: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
Q: Recrystallization is a process that can remove what, contaminants result when compounds are synthesized.
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Recrystallization is a process that can remove what, which result when compounds are synthesized?