A subreddit showcasing the complexity of those lovely little atoms, as well as other interesting science topics in gif form.
This subreddit is dedicated to showcasing interesting and entertaining chemical reactions. Read our Wiki for more information on the types of posts you will see here.. Due to our subreddit's size and variety of interesting gifs, over time this we have grown to be accommodating to other types of chemistry, physics and biology related gifs (those who would just like to view one type may use our filters on this sidebar).
Physical reactions are allowed, along with an extension of other gifs that we feel relevant to this subreddit which you can read about in our wiki here under the "Post Categories" section. Posts will be tagged accordingly based on what category they fall under.
Not every post that is not a chemical reaction is a physical reaction or relevant to this subreddit's accepted posts. For example a post featuring a can being smashed or the motion of a pendulum will be removed.
All link posts must be in either gif or html5 format. Any link post that is not in one of these formats will be deleted. Any interesting or relevant images or videos (whether they be about the subreddit or a demonstration) must be done in a self post.
No albums of gifs allowed in link post or self post form. This is due to trouble categorizing a post which often has multiple gifs that don't fall under one category and leads to a misleading post and confusion.
Reposts are allowed and will be tagged as such for filtering sake. They will not be removed unless a moderator deems the repost to be of a demonstration or particular gif that has been posted too often (e.g. Mercury(II) Thiocyanate Decomposition).
All link posts must have the source of the gif/html5 video posted in the comments. We expect the original poster to do this, however if someone else does so then it will not be removed. Reposts of a post with a source that do not contain the source in the comments will be deleted.
Link posts utilizing the gif/html5 format to skirt the rules will be removed. For example if a demonstration is posted that is a gif but is essentially static image then it will be removed. We will approach this rule on a case-by-case basis to avoid removing naturally slow/lengthy demonstrations to the best of our ability.
In rare cases, exceptions may be made by the moderators if a post is exceptionally intriguing and relevant to discussion in order to maintain quality standards.
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Please use these to help out fellow redditors that haven't studied chemistry! Live Example.
Na + 6 NH3 → [Na(NH3)6]+e−
2 [Na(NH3)6]+e− → H2 + 2 NaNH2 + 10 NH3
Aside from the redox reaction of the coordination complex being reduced by electrons to yield NaNH2 and hydrogen, something even weirder is taking place here.
In this clip the solution is sufficiently concentrated (>3M) with added Na that a transition from the characteristic blue color of low-energy bound-state solvated electrons to an even more exotic bronze-colored state can be observed.
It is hypothesized that this state is effectively the result of the decreasing stability of low-concentration bound states as the concentration of electrons increases. The resulting transition is very peculiar indeed.
In essence, there is only so much space which allows for the existence of bound states (wherein the free electron polarizes the surrounding solvent such that it is contained in a so-called "bound state") because these bound states occupy a cavity of relatively large volume in the solvent. As more metal is added, more electrons are free in the solution, but the solution is already saturated with these bound electrons. Thus, the electrostatic and exclusion effects become such that any additional electrons added can only exist in a metallic state.
This is peculiar because this metallic state is in the liquid phase and is quite dense. If one continues adding electrons, they always become incorporated into the metallic state because the bound states are saturated. Measuring the electrical conductivity of a solution of sodium in ammonia as a function of concentration supports this conjecture, as the conductivity increases linearly as a function of concentration until it suddenly hits a plateau and doesn't increase any further. This plateau represents the point at which enough electrons are present that the destabilizing effects due the presence of other electrons is large enough that no possible bound state can exist and the whole system becomes metallic.
SO2(g) + PCl5(s) → SOCl2(l) + POCl3(l)
This reaction was conducted in a fume hood. Despite my clear failure to properly secure the all-important argon balloon (note to self: a rubber band won't cut it. use zip ties next time), I am a professional performing this experiment in controlled conditions.
Red phosphorus was heated inside an atmosphere of Argon (three cycles of evacuation via vacuum and repressurization with Argon was performed to remove all air the system prior to heating) to produce white phosphorus.
Obviously, the balloon failed to stay attached due to my clearly inadequate rubber band job. Immediately upon exposure to air the system of mostly gaseous, hot white phosphorus ignited with a startling bang. The white "smoke" that resulted is P4O10, phosphorus pentoxide. Fortunately no persons or glassware were harmed due to proper adherence to PPE and hazard mitigation standards. The only thing harmed was my ego :)
DO NOT ATTEMPT TO REPLICATE. Hopefully this serves as an example of how incredibly reactive and dangerous white phosphorus is.