Anecdotally, I get the impression that more questions are closed at night then in the morning (my timezone is UTC -5). Are there times of day where questions of the same quality remain open longer? Is there a time of day where low-quality questions (which sometimes do reveal intriguing ways of thinking about chemistry) have a higher chance of getting an answer? Once the question is closed, the only way the OP will get feedback is through comments, if folks even spend the time to look at closed questions.
I ran this script to return the number of questions closed per hour. I'm in Greenwich Mean Time so I assume these results are too.
SELECT DATEPART(hh, ClosedDate), COUNT(*) AS ClosedQuestions FROM PostsWithDeleted WHERE PostTypeID=1 AND ClosedDate IS NOT NULL GROUP BY DATEPART(hh, ClosedDate) ORDER BY DATEPART(hh, ClosedDate)
It seems to correlate pretty well with the number of questions ask per hour.
SELECT DATEPART(hh, CreationDate), COUNT(*) AS QuestionAsked FROM PostsWithDeleted WHERE PostTypeID=1 GROUP BY DATEPART(hh, CreationDate) ORDER BY DATEPART(hh, CreationDate)