Catalyst – April 2+3, 2010 Monday Mystery Element! 1. Used to make rods that absorb neutrons during nuclear fission 2. Name comes from the Arabic and Persian words for Borax 3. Can often form 5 bonds

Monday Mystery Element 1. Used to make rods that absorb neutrons during nuclear fission 2. Name comes from the Arabic and Persian words for Borax 3. Can often form 5 bonds BORON

Today’s Agenda  Catalyst  LCM Demo  LCM Lab Part One  LCM Lab Part Two: Plan and Perform  Exit Question

Today’s Objectives  SWBAT plan and perform an experiment to prove the Law of Conservation of Matter.

LCM – It’s Demo Time!  Question: Does the reaction between baking soda and vinegar obey the Law of Conservation of Matter?  Hypothesis: What do you think will happen?

LCM – It’s Demo Time!  Materials:  1 balloon  1 plastic bottle  Petri dish  3 grams baking soda  25 mL vinegar  Balance  Graduated cylinder  Funnel

LCM – It’s Demo Time!  Procedure: 1. Using balance, measure 3 grams of baking soda into Petri dish. 2. Measure mass of balloon and record. 3. Use funnel to pour baking soda into balloon. 4. Using balance, measure mass of balloon and baking soda and record. 5. Using balance, measure mass of empty plastic bottle and record. 6. Use graduated cylinder to measure 25 mL of vinegar. 7. Pour vinegar into plastic bottle. 8. Using balance, measure mass of bottle and vinegar and record. 9. Place balloon on top of plastic bottle. 10. Pour baking soda from balloon into the bottle. 11. Observe changes. 12. Measure the mass of the entire apparatus.

LCM – It’s Demo Time!  Data  Record the Mass Reactants and Mass Products  Conclusion  Explain what happened in the experiment  Give supporting evidence for 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 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? WORK QUICKLY BUT CAREFULLY!  Complete PART ONE of the Lab and answer Post- Lab Questions  Plan PART TWO of the Lab, perform Lab, and answer Post-Lab Questions (finish for Homework)  You may perform ONE of the following reactions:  Baking soda + vinegar  Alka Seltzer + water

PART TWO: Available Materials  Balance  Graduated cylinder  Beaker  Zip-Loc baggie  Funnel  Spatula  Test tubes  Glass stirring rod  Water  Up to 3 grams of baking soda OR  1 Alka Seltzer tablet  Up to 25 mL of vinegar

Exit Question 1. Dr. Spock performed a reaction in space. The mass of the reactants was 77.5 grams. The mass of the products was 71.2 grams. Did Dr. Spock’s reaction obey the LCM? Why or why not? WRITE IN COMPLETE SENTENCES! HOMEWORK TONIGHT: Finish writing procedure for LAB PART TWO