Students will observe and measure the evolution of carbon dioxide gas from the decomposition of calcium carbonate when mixed with an acid. Students will also create experiments to determine the rate of reaction with different concentrations of hydrochloric acid. The activity contains enough materials for 15 groups of students as well as a Teacher’s Guide and Student Study Guide Copymasters. Meets Big Idea 4, Investigation 10, Primary Learning Objective 4.1. Kit Includes: 1 x 200g Marble Chips 1 x 500mL Hydrochloric Acid, 1M 2 x 500mL Hydrochloric Acid, 3M 1 x 500mL Hydrochloric Acid, 6M 15 pieces Silicon Tubing 15 Dispensers,10mL Materials needed but not supplied: Balance, 0.001g Precision (shared) Water, Distilled Timer or Stop Watch Erlenmeyer Flasks #2 Rubber Stoppes, One Hole Glass Tubing, 3 – 4cm Graduated Cylinders, 25mL Laboratory Stands Burette Clamps or 3-prong Clamps DOT Info: UN1789, Hydrochloric acid, 8, III, Ltd Qty WARNING: This product can expose you to chemicals including Respirable crystalline silica, which is known to the State of California to cause cancer. For more information go to http://www.P65Warnings.ca.gov.