Catalyst – September (4+3)(3), 2009 Monday Mystery Element!  Used to make rods that absorb neutrons during nuclear fission  Name comes from the Arabic and Persian words for Borax  Can often form 5 bonds

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

Today’s Agenda  Catalyst  Group of the Week (from last week!)  Dream Lab Projects (10 min)  Types of Matter  Law of Conservation of Matter Notes/Demo  Plan procedure to prove LCM  Exit Question

Today’s Objectives  SWBAT distinguish between different types of matter.  SWBAT plan a procedure for an experiment to prove the Law of Conservation of Matter.

Front DoorProjector 3rd Period Group 3 Jessie, Sean, Devone, Bridget Group 2 William, Jalen, Tynisha, Derrick Group 1 David, Justin, Thien, Antoinette Group 6 Tonisha, Willie, James, Tierra Group 5 Jonas, Jeremy, Christian, Maya Group 4 Emanuel, Jonathon, Rochelle, Michael Group 9 Group 8 Group 7 GROUP SHUFFLE!

Dream Lab Showdown And the winner is….

Brandi’s Lab

Dream Lab Showdown And the runner-up is….

Seandell’s Lab

Overall Rankings of Submitted Plans 1. Brandi Dean – West Jeff (10 points) 2. Seandell Collins – Higgins (9 points) 3. Jalen Brown – Higgins (8 points) 4. Seena Frisella – West Jeff (7 points) 5. Qshanna Watson – West Jeff (6 points) 6. Thien Pham – Higgins (5 points) 7. Emanuel McCall – Higgins (4 points) 8. Chelsea Jones – Higgins (3 points) 9. Tydra Ekeh – West Jeff (2 points) 10. Huda Afeneh – West Jeff (1 point)

Dream Lab Showdown The school with the most points for all submitted plans is….

Book Reading  Read pages 66 – 67; answer questions on own paper; you have 5 minutes 1. What is a mixture? What is an example of a mixture? 2. How are mixtures classified? 3. Is pizza a mixture? Why or why not? 4. What is another name for a homogeneous mixture? 5. Is separation of mixtures a physical or chemical process?

Pure Substances Key Point #1: A pure substance is a type of matter that is made of all the same thing – uniform composition All of the particles in a substance are the same.

Examples of Pure Substances  Elements  Compounds (2 or more elements chemically combined) Platinum (Pt) Water (H 2 O)

Mixtures Key Point #2: A mixture is a combination of 2 or more pure substances. The particles in each substance keep their own identities. + =

Two Types of Mixtures 1. Homogeneous = Solutions  Constant composition throughout  Particles keep their identity Solvent: substance that does the dissolving Solute: substance that is dissolved

Homogeneous Mixtures Can you think of some examples of homogeneous mixtures?

Two Types of Mixtures 2. Heterogeneous  Does not blend perfectly  Composition not constant

Heterogeneous Mixtures Can you think of some examples of heterogeneous mixtures?

Matter Review Homework Due Wednesday!  Matter Review Assignment Book, pages Complete questions: 33, 36, 37, 39, 40, 42, 45, 50, 61-64, 74

Matter Review Homework Due Wednesday!  Matter Review Assignment Book, pages Complete questions: 2-4, 6, 12-17, 23-26

Law of Conservation of Matter (LCM) Key Point #1: The Law of Conservation of Matter states that matter cannot be created or destroyed, only changed from one form of matter to another. What goes in must come out!

Gimme an L! Gimme a C! Gimme an M! In a physical change…. Mass Beginning Stuff = Mass Ending Stuff

LCM and Physical Changes # Particles Beginning Stuff = # Particles Ending Stuff Mass Beginning Stuff = Mass Ending Stuff Cut

LCM and Physical Change # Particles Beginning Stuff = # Particles Ending Stuff Mass Beginning Stuff = Mass Ending Stuff Dissolve

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

LCM and Chemical Change Mass Reactants = Mass Products Chemical Reaction New Substance

LCM and Chemical Change Mass Reactants = Mass Products Chemical Reaction Particles Rearrange

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?  Write as “If, then” statement  If IV changes, then DV changes.

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

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  Graph data – What kind of graph would be the best for this experiment?  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?  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  Petri dish  Glass stirring rod  1 Alka Seltzer tablet  Water  Up to 3 grams of baking soda  Up to 25 mL of vinegar

Exit Question 1. Label the following as either a pure substance (PS) mixture (M): a) Salt water b) Hydrogen c) Salad 2. Dr. Spock performed a reaction in space. The mass of the reactants was 46.3 grams. The mass of the products was 77.5 grams. Did Dr. Spock’s reaction obey the LCM? Why or why not?