sps2d. demonstrate the law of conservation of matter in a chemical reaction. sps2e. apply the law of...
DESCRIPTION
Chemical Reaction The recombination of atoms in one substance to form a new substance VIDEOTRANSCRIPT
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SPS2d. Demonstrate the Law of Conservation of Matter in a chemical
reaction.SPS2e. Apply the Law of
Conservation of Matter by balancing the following types of chemical
equations:Decomposition
SynthesisSingle ReplacementDouble Replacement
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Mentos Video
• http://www.youtube.com/watch?v=hKoB0MHVBvM
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Chemical Reaction
The recombination of atoms in one
substance to form a new substance
VIDEO
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Evidence of a chemical reaction:a. Gas is released
b. Temperature changeExothermic – heat released
Endothermic – heat is absorbed
c. Color changed. Precipitate is formed
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RE-CALL what you remember from earlier this year.
Evidence of a Chemical Reaction
Gas is Released
Temperature Change
Precipitate is Formed
Color Change
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3 parts of chemical reaction:
REACTANTS
YEILD
PRODUCT
FLASH CARD and Three Different Colored Markers
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1. Reactants – substances you start with
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2. Yield
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3. Products – substance you end with
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HOMEWORK – Due Wednesday
• Finish the worksheet on labeling the parts of a reaction.– Products– Reactants– Yeild
QUIZ WEDNESDAY!Over this topic…..
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Get Clickers!
• Clear off desks
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Get Homework Sheet Out!
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Quiz• Enter 1 to 5• 6. Sodium nitrate• 7. Silver Nitrate• 8. Sodium Chloride• 9. Silver chloride• 10. Zinc Sulfate• 11. Zinc• 12. Iron• 13. Iron Sulfate
A = ProductsB= Reactants
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SPS2d. Demonstrate the Law ofConservation of Matter in a
chemical reaction
EQ: How does the Law of Conservation of Matter apply to
balancing equations?
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4HCl + MnO2 MnCl2 + 2H20 + Cl2
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Color Code Parts of Equation3 colors
3H2O
3 = Coefficient (can change)HO = Elements2 = Subscript (can NOT change)
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Chemical Equation• Short hand way to describe a chemical
reaction• Uses chemical symbols and numbers to
show the reaction
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Examples:Na + Cl --> NaCl
2NaCl + 2H2SO4 + MnO2 --> Na2SO4 + MnSO4 + 2H2O + Cl2
NaCl + H2O <--> H2O + Na+1 + Cl-1
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Parts of a Chemical Equation
• Reactants – to the left of arrow• Products – to the right of arrow• Yield – is the arrow• (s) - solid• (l) - liquid• (g) - gas• (aq) – aqueous solution, reacts with H20
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TOD
• WRITING CHEMICAL EQUATIONS• Complete BOTH sides of the worksheet• REMINDER
– QUIZ tomorrow on labeling all the parts of a chemical equation
+ Oxygen
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Activator
• The parts of a chemical reaction QUIZ.• Clear off desk• Keep out PEN or PENCIL only
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Can you figure out the total numberof each element?
• (NH4)2so4
ELEMENT TOTAL NUMBER
NHS0
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2HgO --> 2Hg + O
Element TotalHg
O
Element TotalHg
O
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3CaCl2• Put a star next to the subscript• Circle the coefficient• Subscript
– Multiplies only the atom it is attached to• Coefficient
– Multipiles everything after it
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Pointers for balancing equations:• Never change subscripts when balancing
equations• Always double check – changing one may
change something you thought was already balanced
http://education.jlab.org/elementbalancing/cookie_error.html
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Balancing Chemical Equations:• Law of Conservation• Must have same kinds/numbers of atoms
on both sides of the equation
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N2 + H2 NH3
H2 + O2 H2O
(NH4)2CO3 ---> NH3 + CO2 + H2O
Are these balanced?If NOT Balance them…..
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REMINDER
NaCl is a compound and happily married
….Coefficient Coefficient goes in FRONT not between,
effecting both!
Na + Cl are two different elements NOT happily
married ….. Coefficient goes in front of either or both only,
the PLUS sign separates them.
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Steps to Balancing a Chemical Equation
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GET OUT SOME PAPER….TO BE SUCCESFUL YOU MUST BE ORGANIZED AND MAKE A CHART TO DOUBLE CHECK YOUR WORK!
IN
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N2 + H2 NH3
Reactants Products
Num. 1
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KClO3 KCl + O2
Reactants Products
Num. 2
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Num. 5
Pb(OH)2 + HCl H2O + PbCl2Reactants Products
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AlBr3 + K2SO4 KBr + Al2(SO4)3
Reactants Products
Num. 6
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TOD1. Cu + O2 ----> Cu2O
2. H2 + O2 ----> H2O
3. Mg + P4 ---> Mg3P2
4. H2SO4 + NaOH ----> H2O + Na2SO4
5. CaCl2 + AgNO3 ----> AgCl + Ca(NO3)2
Don’t forget WOD tomorrow!
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http://video.about.com/chemistry/How-to-Balance-Chemistry-Equations.htm
• How does the Law of Conservation of
Mass/Matter apply to balancing chemical
equations?
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PRACTICE
• 10.• 15.
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QUIZ Time!
• Complete 1 to 10
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Have Your Homework OutWith Your Name Ready To Turn In• Achieve3000
– BURNING WOOD: BAD FOR THE PLANET– Complete:
• All Summaries• Activity• Thought Question
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Take out homework!
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Think about this!• What happens to the amount of
matter in this reaction?
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What is the Law of Conservation of Matter?
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Law of Conservation of Matter
• States that matter can not be created or destroyed.
• What you start with in a reaction is still the same after the reaction just redistributed
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LAB TIME! http://www.youtube.com/watch?v=5o-UjU8l_3M&feature=related
CH3COOH + NaHCO3 -> H2O + NaOCOCH3 + CO2
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More Balancing Practice
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Clear off desks!FOLDABLE DAY
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GET CLICKERS!• ANYONE NEED TO TURN IN
HOMEWORK…..Have it out.• PROGRESS REPORTS due Friday.
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4 Types of Chemical Reactions
• Synthesis• Decomposition• Single Replacement• Double Replacement
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Synthesis• Simple compounds put together to make
complex ones • A + B AB• 2H2 + O2 2H2O
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Decomposition
• Complex compounds broken down into simple ones
• ABC A + B + C• CH3OH CO + 2H2
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Single Replacement
• One atom switched place with another• AB + C AC + B• 2Al + 3 CuCl2 2AlCl3 + 3 Cu
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Double Replacement
• Two atoms switch• AB + CD AD + BC• 2KI + Pb(NO3)2 KNO3 + PbI2
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TOD: Complete the Practice Sheet
• Turn in to Ms. Weis and get another balancing sheet!
• Quiz tomorrow over everything in unit.• Balancing Review – THURSDAY @ 3:30• Unit Test this FRIDAY:
– 19 Multiple Choice– 7 Matching– 4 Balancing
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What is the Law of Conservation of Matter?
GET CLICKERS!
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Unit Test Tomorrow