catalyst – september (4+3)(3), 2009 monday mystery element! used to make rods that absorb...
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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?
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