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<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="author" content="Prof Mark J. Winter"> <meta name="generator" content="Two-finger-typist"> <meta name="description" content="Chemputer calculates isotope patterns, element percentages, molecular shape (VSEPR), oxidation numbers, oxidation state, chemical reaction yields, MLXZ, valence number, coordination number, etc.."> <meta name="Copyright" content="Chemputer Copyright 1993-2023 Prof Mark J. Winter, University of Sheffield"> <meta http-equiv="Keywords" content="chemistry, chemputer, isotope pattern, MLXZ, MLX, oxidation number, oxidation state, valence number, coordination number, reaction yield, elemeent percentages"> <title>Chemputer</title>  <link href="assets/dist/css/bootstrap.min.css" rel="stylesheet"> <style> .bd-placeholder-img { font-size: 1.125rem; text-anchor: middle; -webkit-user-select: none; -moz-user-select: none; user-select: none; } @media (min-width: 768px) { .bd-placeholder-img-lg { font-size: 3.5rem; } } </style>  <link href="css/starter-template.css" rel="stylesheet">  <link href="css/chemputer.css" rel="stylesheet"> </head> <body> <nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top"> <div class="container-fluid"> <a class="navbar-brand" href="index.html">Chemputer</a> <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#ChemputerNav" aria-controls="ChemputerNav" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> <div class="collapse navbar-collapse" id="ChemputerNav"> <ul class="navbar-nav me-auto mb-2 mb-md-0"> <li class="nav-item active"><a class="nav-link" aria-current="page" href="isotope_pattern.html">Isotope Pattern</a></li> <li class="nav-item"><a class="nav-link" href="element_percent.html">Element %</a></li> <li class="nav-item"><a class="nav-link" href="reaction_yield.html">Reaction yield</a></li> <li class="nav-item"><a class="nav-link" href="classification.html">Classification</a></li> <li class="nav-item"><a class="nav-link" href="vsepr.html">VSEPR</a></li> </ul> </div> </div> </nav> <main class="container"> <div class="starter-template text-center py-5 px-3"> <h1>Sheffield Chemputer</h1> <p>The Sheffield ChemPuter is a reincarnation (in progress) of a set of simple interactive calculators for chemistry launched in 1993. Use it to calculate or determine:</p> <ul> <li><a href="isotope_pattern.html">Isotope Patterns</a> from your choice of formula</li> <li><a href="element_percent.html">Element percentages</a> from your choice of formula</li> <li><a href="reaction_yield.html">Reaction yield</a> from your reaction</li> <li><a href="classification.html">Classification</a> of an atom in your choice of compound (valence) <ul> <li>Valence number (VN)</li> <li>Coordination number (CN)</li> <li>Oxidation number (ON)</li> <li>MLXZ classification</li> <li>MLXZ equivalent neutral class (ENC) classification</li> </ul> <li><a href="vsepr.html">VSEPR</a> shape of simple molecules</li> </ul> <h1>History of The Sheffield Chemputer</h1> <p>The Sheffield ChemPuter was first launched in 1993 as an exercise to see if the then new-fangled WWW was in any way useful for chemistry (H.S. Rzepa, B.J. Whitaker, and M.J. Winter, "Chemical applications of the World-Wide-Web system", <em>J. Chem. Soc., Chem. Commun.</em>, 1994, 1907-1910, <a href="https://doi.org/10.1039/C39940001907">https://doi.org/10.1039/C39940001907</a>).</p> <p>Originally it was a service using the <a href="https://www.machttp.org">MacHTTP WWW server</a> running on a desktop Macintosh SE30. The server used the much lamented <a href="https://www.bbc.com/future/article/20190722-the-apple-software-that-inspired-the-internet">HyperCard</a> to execute the calculation; communication between the server software and HyperCard was achieved with <a href="https://developer.apple.com/library/archive/documentation/AppleScript/Conceptual/AppleScriptX/AppleScriptX.html">AppleScript</a>. A later version was based upon <a href="https://en.wikipedia.org/wiki/WebSTAR">WebStar</a>/<a href="https://en.wikipedia.org/wiki/Apple_event">AppleEvents</a>/<a href="https://www.supercard.us">SuperCard</a>.<p> <p>This current version is something of a much-delayed resurrection of The Chemputer created during Covid-19 restrictions and is <strong>not yet finished</strong>. It does its calculations using server-side <a href="https://www.php.net">PHP</a> but the code is still based upon my early <a href="https://en.wikipedia.org/wiki/HyperTalk">HyperTalk</a> algorithms.</p> </div> <hr /> <address class="address">Chemputer, a set of simple calculators for chemistry: <a href="https://winter.group.shef.ac.uk/chemputer/">https://winter.group.shef.ac.uk/chemputer/</a><br />Copyright 1993-2023 <a target="_blank" href="https://winter.group.shef.ac.uk/">Prof Mark J. Winter</a> [<a href="https://www.shef.ac.uk/chemistry/" target="_blank">Department of Chemistry, The University of Sheffield</a>]. All rights reserved.</address> </main> <script src="assets/dist/js/bootstrap.bundle.min.js"></script> </body> </html>