# Tag Info

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Sizing for images If you post to Imgur (the default host for StackExchange) you can use URL suffix codes to change the size of the image in your answer or question: $$\small \begin{array}{clcc} \hline \text{Thumbnail Suffix} & \text{Thumbnail Name} & \text{Thumbnail Size} & \text{Keeps Image Proportions} \\ \hline \text{s} & \text{Small ... 30 Units formatting Units should always be upright, and be separated by value with a space. This can be achieved best in MathJax with the sequence ~\mathrm{ place unit here }. The tilde generates the space, \mathrm{...} makes sure the text is upright. If your units are a product and/or with superscripts, separate them with a small space \,. Nice additional ... 25 Overview and Quicklinks (ordered chronological, oldest entry first) Units formatting Use mhchem to format chemical expressions Sizing for images Grammar, spelling, and style Clean, descriptive titles improve searching. Remove MathJax / \rm \LaTeX markup in question titles. Be judicious when editing questions that are [on hold] or [closed]. Don't let the ... 23 Be judicious when editing questions that are [on hold] or [closed]. Editing posts bumps them back to the top of the main page. Only edit closed questions that you think you can improve them to the point that they can be reopened. There is little benefit to the site when low-quality questions with minor edits are bumped to the top pushing more recent ... 23 Clean, descriptive titles improve searching. Martin mentioned it in a comment, but I will summarize here. Good titles help make questions about chemistry experiments, exercises, and problems more searchable. Titles help people find questions, and not just using the internal search. Good question titles will show up in Google (and other search engine) ... 19 Don't let the broad tag be Tags help define categories for questions and thus they make searching easier. Occasionally I see posts — from relatively new users especially — that contain only one broad tag like organic-chemistry, inorganic-chemistry(this one's really broad and unhelpful as the only tag on a question), everyday-chemistry, etc. ... 19 Use mhchem to format chemical expressions (For people out there who don’t know this … yet.) We have the wonderful mhchem package which comes with the even more wonderful \ce{...} command. What this command basically does, is take plaintext input like you would put it in a chat message, and transforms it into beautiful chemical expressions. (It only works ... 18 How to find out if a tag is good to have/make I present to you, the MAR Tag Test™ (abbreviated as MATT), a short test with three possible responses to each question, designed as a crude way of diagnosing the health of a (imaginary) tag. Imagine X, a tag\,\ldots 1: Ignore spam. Some people used to tag stuff as beginner or subjective to prevent their ... 16 Use display style maths wherever possible Inline maths mode should be only used for short introductions of terms, a sum formula of a compound. For more complex terms, like fractions or sums, it messes with the spacing of the body and it might become unreadable. Examples Using inline maths environment to produce a rather complicated term with a fraction ... 15 On Stack Exchange, we generally like having substantial edits being made. Somebody who edits a post to correct one or two typos is helpful, but somebody who also takes the time to improve the title and retag the question is even more helpful. Therefore, here are some basic guidelines for editing: Titles Please make sure that a descriptive title is added ... 14 Text and spaces in MathJax Trying to put a short phrase in your MathJax, but your spaces keep disappearing? There are a few ways to explicitly insert spaces. For a short phrase it is best to use the \text{...} command like$$\Delta x\, \Delta p \ge \frac{\hbar}{2} , \text{with } \hbar=\frac{h}{2\pi}$$which produces$$\Delta x\, \Delta p \ge \frac{\...

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Comprehensive editing I’d like to add another issue that I see not happening way too often: When editing for any of the other points, do a simple check of the text and the MathJax involved, too. Oftentimes I see someone edit the title but not touch the body even though it could be greatly improved by a simple two-minute check, revising capitalisation, ...

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Update 2017-05-01 The MathJax CDN retired and the javascript-URL idea is not so easy any more, because of browser security. (Chrome stips away any leading javascript: when pasting into the URL line. SE modified the javascript: link so that it does not work.) So here is my take. I modified the script to load the new mhchem (v3), together with cancel (and ...

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Based on the same principle, this little bookmarklet loads cancel in addition to mhchem: javascript:(function(){if(window.MathJax===undefined){var%20script%20=%20document.createElement(%22script%22);script.type%20=%20%22text/javascript%22;script.src%20=%20%22http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML%22;var%20config%20=%20%...

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Remove salutations, stick to the point This deserves a place on its own, since it seems to be being ignored a lot. Simply put, don't forget to remove these when you see them in the post while editing: Any kind of thanks, mostly found in questions, e.g. Thanks. or Many thanks. or Any help is appreciated. or Thanks in advance. or Thank you. ...

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Use environments to cluster mathematical expressions MathJax provides a basic subset of environments for clustering mathematical expressions. For a complete list, see here, but be warned it is a very big page. Environments are entered with the following syntax, some of them do not need to be explicitly entered with mathmode, but it is no harm doing so. \...

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Grammar, spelling, and style I go heavy on grammar, spelling, and style. Editors tend to ignore blatant abuse of apostrophes (and lack thereof). Capitalization is another minefield (people love to capitalize element names, for instance). One item that comes up a lot is can vs. could, and other variants which are more complex (but I know them when I see them):...

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Where can I learn more about organic synthesis? Books specifically about synthesis planning: The Logic Of Chemical Synthesis, 1995, E. J. Corey, and Xue-Min Cheng. A fairly advanced book covering retrosynthesis and general approaches to organic synthesis of complex molecules. The 1989 version is available for free at the internet archive. Organic ...

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(4) Learning by example The MathJax and mhchem syntax in the left-hand side must be enclosed in single dollar signs $...$ for an inline (smaller) equation, or double dollar signs $$...$$ for a larger, centred, display-style equation. Type... To get... \ce{H2O} $$\ce{H2O}$$ \ce{Ca^2+(aq) + 2 OH-(aq) <=> Ca(OH)2(s)} \ce{Ca^2+(aq) + 2 OH-(aq) <=&...

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Using favourite tags to find cool content faster and ignoring boring stuff You might be interested in some very specific topic and you want to easily identify questions, that are categorised in this topic. I come with great news for you. You can have "Favorite Tags". Favourite tags you already have show up below the "Hot Meta Posts" box ...

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Using tags in searching Tags can be a very strong tool for searching. The more healthy a site's tagging system is, the more effective tag searching will be. Currently, tags is the second most applied tag on meta, which means users and editors on Chemistry Stack Exchange do care about tags. Let's get down to business, shall we? To search using the tag lolic-...

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Above and below in mathematical (or chemical) expressions I will fully admit that this post is also a personal memo of how I do it, but it is also a great feature I wish to share. The problem Sometimes, you may wish to signalise formal charges, oxidation states or other things within an inline structural formula typeset by mhchem. Or you may want to add a ...

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Add color to track/emphasize terms Want to show how a molecule proceeds through a series of reactions? Be judicious and think about the color-blind \color{[color]}{[text]} will generate colored text as follows $\color{pink}{\ce{Co^2+}}$ yields $\color{pink}{\ce{Co^2+}}$ $\color{magenta}{\ce{Cr^2+}}$ yields $\color{magenta}{\ce{Cr^2+}}$ \$\color{salmon}{\...

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4. What citation style should I use? In general, the citation must fulfill three requirements: it should be human-readable it should contain sufficient information for another person to identify and locate the source if applicable, it should include a URL to the source. The URL should ideally be a digital object identifier (DOI) link, of the form https://...

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