Unsolved problems in chemistry tend to be questions of the kind "Can we make
X chemical compound?", "Can we analyse it?", "Can we
purify it?" and are commonly solved rather quickly, but may just as well require considerable efforts to be solved. However, there are also some questions with deeper implications. This article tends to deal with the areas that are the center of new
scientific research in
chemistry. Problems in chemistry are considered unsolved when an expert in the field considers it unsolved or when several experts in the field disagree about a solution to a problem.