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Projector Screen

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

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Projector Screen

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  1. L R Projector Screen

  2. L R Projector Screen

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

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

  5. Today’s Agenda • Catalyst • Dream Lab Projects (10 min) • Types of Matter • Law of Conservation of Matter Notes/Demo • Plan procedure to prove LCM • Exit Question

  6. 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.

  7. Dream Lab Showdown And the winner is…. Brandi Dean

  8. Brandi’s Lab

  9. Dream Lab Showdown And the runner-up is…. Seandell Collins

  10. Seandell’s Lab

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

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

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

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

  15. Examples of Pure Substances • Elements • Compounds (2 or more elements chemically combined) Platinum (Pt) Water (H2O)

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

  17. 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

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

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

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

  21. Separation of Mixtures Review • Matter Review Assignment Book, pages 82-84 Complete questions: 33, 36, 37, 39, 40, 42, 45, 50, 61-64, 74

  22. 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!

  23. Gimme an L! Gimme a C! Gimme an M! In a physical change…. MassBeginning Stuff = MassEnding Stuff

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

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

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

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

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

  29. 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.

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

  31. LCM – It’s Demo Time! • Procedure: • Using balance, measure 3 grams of baking soda into Petri dish. • Measure mass of balloon and record. • Use funnel to pour baking soda into balloon. • Using balance, measure mass of balloon and baking soda and record. • Using balance, measure mass of empty plastic bottle and record. • Use graduated cylinder to measure 25 mL of vinegar. • Pour vinegar into plastic bottle. • Using balance, measure mass of bottle and vinegar and record. • Place balloon on top of plastic bottle. • Pour baking soda from balloon into the bottle. • Observe changes. • Measurethe mass of the entire apparatus.

  32. LCM – It’s Demo Time! • Data • Record the MassReactants and MassProducts • 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!

  33. 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.)

  34. 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!!!

  35. 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.)

  36. 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.

  37. 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.)

  38. 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.

  39. 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.)

  40. 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!

  41. 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.)

  42. 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)

  43. Balance Graduated cylinder Beaker Zip-Loc baggie Funnel Spatula Glass stirring rod 1 Alka Seltzer tablet Water Up to 3 grams of baking soda Up to 25 mL of vinegar Available Materials

  44. Exit Question • Label the following as either a pure substance (PS) mixture (M): • Salt water • Hydrogen • Salad • 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?

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