This lesson and activity is part of the Chemical Educational Foundation’s® (CEF) award-winning You Be The Chemist®Activity Guides, a free resource for educators and parents who want to introduce students to chemistry and science concepts in a fun, hands-on manner. The guides feature nearly 1,000 pages of lesson plans, science content, and activity sheets for students in grades K – 8. Download the guides for free atwww.chemed.org/ybtc/guides/. CEF’s other programs are the You Be The Chemist Challenge® (a national academic competition for grade 5 – 8 students) and You Be The Chemist® Essential Elements (professional development workshops for educators). In 2014 CEF celebrates its 25th anniversary. Find out more at www.chemed.org.