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Chemical Reaction The recombination of atoms in one substance to form a new substance VIDEO
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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
Mentos Video
• http://www.youtube.com/watch?v=hKoB0MHVBvM
Chemical Reaction
The recombination of atoms in one
substance to form a new substance
VIDEO
Evidence of a chemical reaction:a. Gas is released
b. Temperature changeExothermic – heat released
Endothermic – heat is absorbed
c. Color changed. Precipitate is formed
RE-CALL what you remember from earlier this year.
Evidence of a Chemical Reaction
Gas is Released
Temperature Change
Precipitate is Formed
Color Change
3 parts of chemical reaction:
REACTANTS
YEILD
PRODUCT
FLASH CARD and Three Different Colored Markers
1. Reactants – substances you start with
2. Yield
3. Products – substance you end with
HOMEWORK – Due Wednesday
• Finish the worksheet on labeling the parts of a reaction.– Products– Reactants– Yeild
QUIZ WEDNESDAY!Over this topic…..
Get Clickers!
• Clear off desks
Get Homework Sheet Out!
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
SPS2d. Demonstrate the Law ofConservation of Matter in a
chemical reaction
EQ: How does the Law of Conservation of Matter apply to
balancing equations?
4HCl + MnO2 MnCl2 + 2H20 + Cl2
Color Code Parts of Equation3 colors
3H2O
3 = Coefficient (can change)HO = Elements2 = Subscript (can NOT change)
Chemical Equation• Short hand way to describe a chemical
reaction• Uses chemical symbols and numbers to
show the reaction
Examples:Na + Cl --> NaCl
2NaCl + 2H2SO4 + MnO2 --> Na2SO4 + MnSO4 + 2H2O + Cl2
NaCl + H2O <--> H2O + Na+1 + Cl-1
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
TOD
• WRITING CHEMICAL EQUATIONS• Complete BOTH sides of the worksheet• REMINDER
– QUIZ tomorrow on labeling all the parts of a chemical equation
+ Oxygen
Activator
• The parts of a chemical reaction QUIZ.• Clear off desk• Keep out PEN or PENCIL only
Can you figure out the total numberof each element?
• (NH4)2so4
ELEMENT TOTAL NUMBER
NHS0
2HgO --> 2Hg + O
Element TotalHg
O
Element TotalHg
O
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
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
Balancing Chemical Equations:• Law of Conservation• Must have same kinds/numbers of atoms
on both sides of the equation
N2 + H2 NH3
H2 + O2 H2O
(NH4)2CO3 ---> NH3 + CO2 + H2O
Are these balanced?If NOT Balance them…..
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.
Steps to Balancing a Chemical Equation
GET OUT SOME PAPER….TO BE SUCCESFUL YOU MUST BE ORGANIZED AND MAKE A CHART TO DOUBLE CHECK YOUR WORK!
IN
N2 + H2 NH3
Reactants Products
Num. 1
KClO3 KCl + O2
Reactants Products
Num. 2
Num. 5
Pb(OH)2 + HCl H2O + PbCl2Reactants Products
AlBr3 + K2SO4 KBr + Al2(SO4)3
Reactants Products
Num. 6
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!
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?
PRACTICE
• 10.• 15.
QUIZ Time!
• Complete 1 to 10
Have Your Homework OutWith Your Name Ready To Turn In• Achieve3000
– BURNING WOOD: BAD FOR THE PLANET– Complete:
• All Summaries• Activity• Thought Question
Take out homework!
Think about this!• What happens to the amount of
matter in this reaction?
What is the Law of Conservation of Matter?
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
LAB TIME! http://www.youtube.com/watch?v=5o-UjU8l_3M&feature=related
CH3COOH + NaHCO3 -> H2O + NaOCOCH3 + CO2
More Balancing Practice
Clear off desks!FOLDABLE DAY
GET CLICKERS!• ANYONE NEED TO TURN IN
HOMEWORK…..Have it out.• PROGRESS REPORTS due Friday.
4 Types of Chemical Reactions
• Synthesis• Decomposition• Single Replacement• Double Replacement
Synthesis• Simple compounds put together to make
complex ones • A + B AB• 2H2 + O2 2H2O
Decomposition
• Complex compounds broken down into simple ones
• ABC A + B + C• CH3OH CO + 2H2
Single Replacement
• One atom switched place with another• AB + C AC + B• 2Al + 3 CuCl2 2AlCl3 + 3 Cu
Double Replacement
• Two atoms switch• AB + CD AD + BC• 2KI + Pb(NO3)2 KNO3 + PbI2
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
What is the Law of Conservation of Matter?
GET CLICKERS!
Unit Test Tomorrow