Law of Conservation of Mass Lab

Background knowledge: what is the Law of Conservation of Mass? ____________________________________________________________________________

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Question/Purpose: Will the mass of the reactants be the same as the mass of the products after a chemical reaction?

Hypothesis: (If this happens then, that will happen.) _______________________

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•	plastic film canister with lid or any plastic container sc •	balance Materials:

•	5 g (1 tsp) baking soda

•	large, strong, sealable plastic bag

•	5 mL (1 tsp) vinegar

Scale or balance

Procedure:

1. Place 5 g of baking soda into a plastic container. Put the lid on the container.

2.	Place 5 mL of vinegar into a plastic bag.

3.	Place the canister into the bag. Squeeze the air out of the bag. Seal the bag tightly.

4. Use a scale or balance to measure the mass of the bag and its contents. Record the mass.

5. Keeping the bag closed, open the canister in the bag. Mix the vinegar with the baking soda.

6. When the reaction has stopped, measure the mass of the bag and its contents. Record the mass.

Results: (Write a paragraph about what happened using the terms: Law of Conservation of Mass, chemical reaction, CO2, initial amount and final amount.)

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Table/Graph:

Initial mass (g)	Final mass (g)

Discussion Questions:

1. Describe the chemical reaction. ___________________________________________

2. Compare the mass of the materials before the reaction and the mass of the materials after the reaction. Explain your observations. ___________________________________________________________________

Conclusion:

a. Was your hypothesis correct or incorrect?

b. Evidence statement/data summary

c. Future Plans

d. Analyze class data