# What is the difference between the "chemistry" and "astrochemistry" tags?

Both the and tags have over a dozen questions.

However there are only four questions that have both tags, and three of those are mine, probably in anticipation that they might be merged in the future.

• Do we need both as tags?
• If so, what is the difference?
• If not, should they be merged?

Here are questions that are tagged , categorized by how well I estimate that would suffice and a separate tag would not be needed. I'm wondering if "chemistry" is even the proper tag or something like "geochemistry" or "planetary-chemistry" might be a better name for it.

tag will probably suffice:

Not sure, depends on what means:

probably not the proper tag:

I don't think we need both tags. I suggest merging the questions into , as we have but no biology tag. I don't think we should create a synonym between chemistry and astrochemistry though. only has four uses this year, so I don't think it will be a big deal to retag manually in the future. That said, we should keep our eyes out for questions that use for questions that are not related to astrochemistry (e.g. planetary geochemistry). If we have any of those, we should keep the chemistry tag and add a tag wiki to clarify its use.

• for my own reference (I can't keep them straight): What are tag synonyms and merged tags? How do they work? I'll check the existing chemistry questions for non-astrochemistry instances, msg here if I find any.
– uhoh
Apr 28, 2019 at 16:02
• @uhoh Did you see any non-astrochemistry instances?
– called2voyage Mod
May 1, 2019 at 13:25
• yes I saw quite a mix, and decided it's best to look at all of them to see what the pattern is. Then got distracted. I'll review them all in the morning. Thanks for the ping.
– uhoh
May 1, 2019 at 13:56
• I've updated the question.
– uhoh
May 2, 2019 at 0:23
• @uhoh I think for the purpose of this site, the "not sure" section can be considered astrochemistry. One of the four "not astrochemistry" questions is closed, so that really only leaves three to be concerned about. Is that enough to justify the continued existence of a chemistry tag? Particularly, those three questions are all more than two years old. Maybe we should just untag the four outliers and merge the rest.
– called2voyage Mod
May 2, 2019 at 3:05
• Yes I see what you mean. Given all of that, it seems like a good idea. Even if askers start typing "chem..." the astrochemistry tag will immediately appear for them.
– uhoh
May 2, 2019 at 3:20
• @uhoh All right, the changes are done. chemistry should have no questions on it now. We'll just have to make sure it doesn't get used again and it should eventually disappear.
– called2voyage Mod
May 2, 2019 at 3:24
• wow that was quick! yes, it shows empty for me. Thanks for your help.
– uhoh
May 2, 2019 at 3:30