Students observe thought-provoking macroscopic chemical changes with this kit's 2 demonstrations. Use the kit to introduce Big Idea 3 or to review chemical reactions in preparation for the AP® Chemistry Exam. A decomposition reaction results in "instant fog," and a unique conductivity activity monitors an acid-base titration. Written for use with the Audible Conductivity Kit (item #840895, sold separately). Materials are sufficient for the 2 demonstrations to be performed twice.