Alka-Seltzer Fizzing-Determination of Percent by Mass of NaHCO3 in Alka-Seltzer Tablets. Students’ dilemmas in reaction Stoichiometry problem-solving: deducing the limiting reagent in chemical reactions, Chemistry Education Research and Practice, 10, 14-23. Secondary school students’ difficulties with stoichiometry, School Science Review, 81, 91-98. Effectiveness of Inquiry-Based Lessons Using Particulate Level Models to Develop High School Students’ Understanding of Conceptual Stoichiometry, Journal of Chemical Education. 4 The procedure is simple enough that students can perform it in their kitchen at home. The final, optional section of the activity provides instructions for an experiment to determine the amount of sodium bicarbonate in an Alka-Seltzer tablet. Image 1: ' Reactants, Products, and Leftovers' PhET simulation (accessed ). In the PhET simulation, Reactants, Products and Leftovers (image 1), students think conceptually about stoichiometry with sandwich making and particle level simulations. Video 1: Chemistry Experiment: Does Alka-Seltzer Tell the Truth? on The Science Classroom YouTube Channel (Published ) Section 2 - Conceptualizing Stoichiometry

After answering related questions on a worksheet (see supporting information), the video teaches students to perform stoichiometric calculations and then applies them in a simple experiment. The activity begins with a short video (video 1) that introduces stoichiometry with a simple baking analogy.

Chemical reaction simulator online