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10 Science Conservation of Mass Lab Name:_____________________ Problem: Is mass conserved when a chemical reaction takes place? Hypothesis:____________________________________________________ _____________________________________________________________ Materials: conical flask small test tube #6 rubber stopper solutions of lead nitrate and potassium iodide triple beam balance Procedure: As outlined in class Observations: Qualitative and mass of empty flask, test tube and stopper mass of flask, test tube, stopper and solutions before reaction mass of flask, test tube, stopper and solutions after reaction _________ _________ _________ Questions; 1. How do you know that a chemical change took place? 2. Write a word equation for the reaction that took place. 3. Which product has a property that allows us to see that a reaction took place? 4. What is the property of the product identified in question #3? 5. Compare the total mass of the reactants with the total mass of the products. 6. The Law of Conservation of Mass states that the total mass of the products in a chemical reaction is equal to the total mass of the reactants. Do your results support the law? Explain. 7. When magnesium metal is heated a white ash forms and the mass increases. Account for these observations which apparently violate the Law of Conservation of Mass. Conclusion: