Here's a fun addition to your Chemistry curriculum toolbox: an Excel spreadsheet that quizzes your students on some of the more popular polyatomic ions. The easily understood interface allows the students to quickly self-test their own understanding of many polyatomic ions, and it can be used repeatedly to ensure mastery of the topic. Even better, for the slightly tech-savvy teacher, this Excel spreadsheet can be altered to test students on just about any topic! Simply change the 20 questions to