1. Law of Conservation of Matter
Objective:
SWBAT design a procedure to prove the law of conservation of matter
Catalyst:
Why did Mr. Jhaveri have to put a balloon on the top of the bottle yesterday?
Give an example of a heterogeneous mixture. A homogenous mixture.

2. LCM and Physical Changes
# ParticlesBeginning Stuff = # ParticlesEnding Stuff
MassBeginning Stuff = MassEnding Stuff
Cut

3. LCM and Physical Change
# ParticlesBeginning Stuff = # ParticlesEnding Stuff
MassBeginning Stuff = MassEnding Stuff
Dissolve

4. Gimme an L! Gimme a C! Gimme an M!
In a chemical change….
Reactants  Products
MassReactants = MassProducts

5. LCM and Chemical Change
MassReactants = MassProducts
Chemical Reaction
New Substance

6. LCM and Chemical Change
MassReactants = MassProducts
Chemical Reaction
Particles Rearrange

7. Example of a Good Conclusion
The reaction between baking soda and vinegar does obey the Law of Conservation of Matter. The LCM states that matter cannot be created or destroyed. That means that the mass of the reactants should equal the mass of the products. At the start of this reaction, there were ## grams of reactants. After the reaction, there were ## grams of products. These masses are very similar/the same; therefore the reaction obeyed the LCM. (The masses are not exactly the same because of experimental error.)

8. Example of a Good Conclusion
“The reaction between baking soda and vinegar does obey the Law of Conservation of Matter.”
This is the statement of what you think!!!

9. Example of a Good Conclusion
The reaction between baking soda and vinegar does obey the Law of Conservation of Matter. The LCM states that matter cannot be created or destroyed. That means that the mass of the reactants should equal the mass of the products. At the start of this reaction, there were ## grams of reactants. After the reaction, there were ## grams of products. These masses are very similar/the same; therefore the reaction obeyed the LCM. (The masses are not exactly the same because of experimental error.)

10. Example of a Good Conclusion
“The LCM states that matter cannot be created or destroyed. That means that the mass of the reactants should equal the mass of the products.”
This explains background information – helps support your conclusion.

11. Example of a Good Conclusion
The reaction between baking soda and vinegar does obey the Law of Conservation of Matter. The LCM states that matter cannot be created or destroyed. That means that the mass of the reactants should equal the mass of the products. At the start of this reaction, there were ## grams of reactants. After the reaction, there were ## grams of products. These masses are very similar/the same; therefore the reaction obeyed the LCM. (The masses are not exactly the same because of experimental error.)

12. Example of a Good Conclusion
“At the start of this reaction, there were ## grams of reactants. After the reaction, there were ## grams of products.”
This is what happened in the experiment.

13. Example of a Good Conclusion
The reaction between baking soda and vinegar does obey the Law of Conservation of Matter. The LCM states that matter cannot be created or destroyed. That means that the mass of the reactants should equal the mass of the products. At the start of this reaction, there were ## grams of reactants. After the reaction, there were ## grams of products. These masses are very similar/the same; therefore the reaction obeyed the LCM. (The masses are not exactly the same because of experimental error.)

14. Example of a Good Conclusion
“These masses are very similar/the same; therefore the reaction obeyed the LCM.”
This ties back into what you think!

15. Example of a Good Conclusion
The reaction between baking soda and vinegar does obey the Law of Conservation of Matter. The LCM states that matter cannot be created or destroyed. That means that the mass of the reactants should equal the mass of the products. At the start of this reaction, there were ## grams of reactants. After the reaction, there were ## grams of products. These masses are very similar/the same; therefore the reaction obeyed the LCM. (The masses are not exactly the same because of experimental error.)

16. Can YOU prove the LCM?
In your group, you will plan a procedure for proving the Law of Conservation of Matter
You will perform the lab tomorrow
You may perform ONE of the following reactions:
Baking soda + vinegar
Alka Seltzer + water
You must complete an entire Lab Report for Homework (due Tuesday in class or Wednesday at the beginning of class)

17. Available Materials Balance Graduated cylinder Beaker Zip-Loc baggie
Funnel
Spatula
Test Tubes
Petri Dish/Watch Glass
Glass stirring rod
1 Alka Seltzer tablet
Up to 25 mL water
Up to 3 grams of baking soda
Up to 25 mL of vinegar

18. Talk it out in groups and remember to get it checked off by me.
Plan yo’ Procedure
Talk it out in groups and remember to get it checked off by me.
After it is done, get started!

19. Exit Question
How come your beginning mass and ending mass were not EXACTLY the same?
Did your data support the Law of Conservation of Matter?