Catalyst – September 2(11), 2009 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?
Catalyst – September 2(11), 2009. Label the following as either a pure substance (PS) mixture (M): Salt water Hydrogen Salad - PowerPoint PPT Presentation
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Catalyst – September 2(11), 20091. 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?
SWBAT plan and conduct an experiment to prove the Law of Conservation of Matter.
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!
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
LCM and Chemical Change
MassReactants = MassProducts
Chemical Reaction
New Substance
LCM and Chemical Change
MassReactants = MassProducts
Chemical Reaction
Particles Rearrange
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 Test Tubes
Glass stirring rod 1 Alka Seltzer
tablet Up to 25 mL of
water Up to 3 grams of
baking soda Up to 25 mL of
vinegar
Exit Question
The goal of a car airbag is to slow a passenger's forwardmotion as evenly as possible in a fraction of a second. Theairbag's inflation system reacts toxic sodium azide (NaN3)with potassium nitrate (KNO3) to produce nitrogen gas
andsodium metal. Hot blasts of the nitrogen inflate the
airbag. In a Honda Civic, there are about 500 grams of sodiumazide (NaN3) in its airbag before inflation. It decomposes
to 323 grams of nitrogen gas. Question: How much sodium metal is produced?
Your Task: Answer the question and support your answer with a quality conclusion.