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 Door

Projector3rd 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 5Jonas, Jeremy,

Christian, Maya

Group 4

Emanuel, Jonathon, Rochelle, Michael

Group 9Group 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 Plans1. 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 thesame.

Examples of Pure Substances Elements Compounds (2 or more

elements chemically combined)

Platinum (Pt) Water (H2O)

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 HomeworkDue Wednesday!

Matter Review Assignment

Book, pages 82-84Complete questions: 33, 36, 37, 39, 40, 42,

45, 50, 61-64, 74

Matter Review HomeworkDue Wednesday!

Matter Review Assignment

Book, pages 44-45Complete 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….

MassBeginning Stuff = MassEnding Stuff

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

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 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!

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 waterb) Hydrogenc) 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?