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<p>[QUOTE=&quot;desertgem, post: 979112, member: 15199&quot;]The basic experiment has probably been around for decades. I remember it from the 70s. I have no idea when it first appeared in a manual, or which one. I can&#039;t even remember the college text I used to teach intro chem in &#039;67, so I sure can&#039;t remember the lab manual. I think it still appears in some current ones, or is passed around by teacher forums. They indicate it can be used for 3rd grade and up ( with adult supervision).</p><p><a href="http://chemistry.about.com/od/chemistryhowtoguide/a/goldsilverpenny.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://chemistry.about.com/od/chemistryhowtoguide/a/goldsilverpenny.htm" rel="nofollow">http://chemistry.about.com/od/chemistryhowtoguide/a/goldsilverpenny.htm</a>[/QUOTE]</p><p><br /></p>

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