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According to a video by the Organic Chemistry Tutor, a quite well-known chemistry channel on YouTube, you can easily identify a redox reaction by seeing if there are atoms in their elemental states on one side of a reaction and form compounds (or compounds decomposing to elemental atoms) on the other. Is this accurate?

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    $\begingroup$ Not quite. True, all such reactions are redox. But not all (and not even most) redox reactions are like this. $\endgroup$ – Ivan Neretin Dec 20 '18 at 5:09
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    $\begingroup$ Do not try to learn chemistry via moronic youtube videos. You can be sure they are going to tell you some supersimplyfied nonsense, which breaks the second you try to use it on sth else. $\endgroup$ – Karl Dec 20 '18 at 5:42
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    $\begingroup$ Counterexample : K+Na -> NaK en.wikipedia.org/wiki/Sodium-potassium_alloy $\endgroup$ – Karl Dec 20 '18 at 5:46
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    $\begingroup$ The problem is that until you have learned a good deal of chemistry, you can't tell moronic videos from the good ones. Ditto for teachers and textbooks. $\endgroup$ – Ivan Neretin Dec 20 '18 at 7:14
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    $\begingroup$ Some textbooks are however known to be good. I wouldn't say the same about youtube channels. ;-) $\endgroup$ – Karl Dec 20 '18 at 7:47
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Here is a redox reaction that does not contain any zero-valent atom:

$$\ce{2FeCl3 + SnCl2 + 2 HCl -> 2 FeCl2 + H2[SnCl6]}\tag{1}$$

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