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.

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

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

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

LCM and Chemical Change MassReactants = MassProducts Chemical Reaction New Substance

LCM and Chemical Change MassReactants = MassProducts Chemical Reaction Particles Rearrange

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.)

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!!!

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.)

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.

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.)

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.

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.)

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!

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.)

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)

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

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!

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?