Law of Conservation Of Mass Lab (Read pages 55 – 65 in text) Purpose: To prove the Law of Conservation Of Mass Hypothesis: Safety: Wear goggles, wash hands after lab. Materials: 1-250mL Erlenmeyer Flask, one tablet of alka-seltzer, 50 mL of water, one balloon, one electronic balance. Procedure: (make sure you run at least 2 trials) Data: Calculations: Questions: 1. Identify the pure substances in the lab. 2. Identify the extensive & intensive physical properties of water. 3. Identify the states of matter in the lab. 4. Identify the chemical & the physical changes that occurred. Give evidence for the chemical change. Conclusion: Write 3-5 sentences – include whether or not your data supports the Law Of Conservation.