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<H1 ALIGN="CENTER">A Tutorial for using Chemis3D</H1>
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<BLOCKQUOTE>
<FONT FACE="Arial Black" SIZE="-1" COLOR="#FF0000">If you don't see a picture of a molecule
below, you need to enable Java in your browser.</FONT>
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<FONT FACE="Arial" COLOR="#008080">If you want to know how to use Chemis3D in your own web
pages, you need to go <a href="http://chemis.free.fr/mol3d/" target="_blank">here</A>.</FONT>
</BLOCKQUOTE>
If Chemis3D Java is working properly in your browser, you will be able to see a model of acetic acid in the onscreen window below. This is called a space-filling model, because the atoms are made large enough to indicate the volume they actually occupy. In Chemis, space-filling models are not correctly implemented.
<TABLE CELLSPACING="5" CELLPADDING="5">
<TR>
<TD><IMG SRC="chime/acetic.gif" WIDTH="86" HEIGHT="71" BORDER="0" ALT="acetic acid structure"></TD>
<TD ROWSPAN="2" ALIGN="CENTER" Valign="middle">space-filling <BR><IMG SRC="chime/arrow.gif" WIDTH=65 HEIGHT=12 BORDER=0 ALT="right arrow"><BR> model</TD>
<TD ROWSPAN="2">
<script language="JavaScript" type="text/javascript">
document.write(ball)
</script>
</TD>
</TR>
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<TD ALIGN="CENTER" VALIGN="TOP">acetic acid</TD>
</TR>
</TABLE>
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If you <B>left</B>-click and drag on the picture, the molecule will rotate freely. Now <B>right</B>-click on the picture. A menu will appear which will allow you to manipulate the model in several ways.
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If you have an older browser, you will have a pop-up menu which appears when the applet loads.
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Click on <I>Rotate</I>, then on <I>Start</I>. The molecule will begin to rotate in the window under its own steam. Stop the rotation by clicking <I>Rotate</I>, then <I>Stop</I>. (In the newer version of Chemis3D, the <I>Rotate</I> function is a toggle.)
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Bring up the menu again and click Display. The options available will be <I>Wireframe</I>, <I>Sticks</I>, <I>Ball & Stick</I> and <I>Spacefill</I>. Look at each of the display modes; stick and ball-and-stick models of acetic acid are shown below.
<TABLE CELLSPACING="5" CELLPADDING="5">
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<script language="JavaScript" type="text/javascript">
document.write(stick)
</script>
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<script language="JavaScript" type="text/javascript">
document.write(bstick)
</script>
</TD>
</TR>
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<TD ALIGN="CENTER">stick model</TD>
<TD ALIGN="CENTER">ball-and-stick model</TD>
</TR>
</TABLE>
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