The Division of Biological and Physical Sciences maintains a page of available internships / research positions. The website is /pages/2557.asp.
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This program is available at many universities and institutions across the country. Most of the programs are 8-10 weeks long and provide a stipend of $3000-$4500, travel, tuition, room, and board! You may get a chance to travel to another part of the country or world and participate in current scientific research. The website is http://www.nsf.gov/crssprgm/reu/reu_search.cfm. You may search it by topic or by location.
Below are a couple of example programs that you may apply to:
Lincoln Nebraska has an REU program accepting applications online: http://www.unl.edu/summerprogram/
Long Island, NY - www.cshl.edu/URP - Summer Undergraduate Research Program at Cold Spring Harbor Laboratory, Dr. James Watson, Chancellor. Accepted sophomore or junior students receive room, board, $4000, and the chance of a lifetime being involved in important scientific work with well-known and respected scientists.
University of Alabama's Summer Undergraduate Research Program (SURP). The website is http://www.bama.ua.edu/~chem/summerprogrs/suurp.html
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The American Chemical Society maintains a list of chemistry summer research positions.
Many positions related to chemistry are also posted. To locate undergraduate research, internship, and other summer work in the chemical sciences, visit the ACS postings.
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Summer Research Institute for Undergraduates - for undergraduates in MS through the AGEM program
Baxter Healthcare, Attn: Tisha Givens, 911 N. Davis, Cleveland, MS 38732.