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mhchem is third-party extension for MathJax, for formatting chemical formulas and equations in particular on Chemistry Stack Exchange, via the \ce command. Read more here - mhchem.github.io/MathJax-mh…
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Buzzwords are frequent phrases that are overly broad and non-descriptive, therefore they don't add anything of value to a question (title). This tag should be used to address such words and how to avo…