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 Synthesis Single Replacement Double Replacement

Mentos Video MHVBvMhttp:// MHVBvM

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 change Exothermic – heat released Endothermic – heat is absorbed c.Color change d.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 = Products B= Reactants

SPS2d. Demonstrate the Law of Conservation of Matter in a chemical reaction EQ: How does the Law of Conservation of Matter apply to balancing equations?

4HCl + MnO 2  MnCl 2 + 2H Cl 2

Color Code Parts of Equation 3 colors 3H 2 O 3 = Coefficient (can change) HO = Elements 2 = 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 + 2H 2 SO 4 + MnO 2 --> Na 2 SO 4 + MnSO 4 + 2H 2 O + Cl 2 NaCl + H 2 O H 2 O + 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 number of each element? (NH 4 ) 2 so 4 ELEMENTTOTAL NUMBER N H S 0

2HgO --> 2Hg + O ElementTotal Hg O ElementTotal Hg O

3CaCl 2 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 ntbalancing/cookie_error.html

Balancing Chemical Equations: Law of Conservation Must have same kinds/numbers of atoms on both sides of the equation

N2N2 +H2H2 NH 3 H 2 + O 2 H 2 O (NH 4 ) 2 CO 3 ---> NH 3 + CO 2 + H 2 O Are these balanced? If NOT Balance them…..

REMINDER Coefficient NaCl is a compound and happily married ….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

N 2 +H 2  NH 3 ReactantsProducts Num. 1

KClO 3  KCl+O 2 ReactantsProducts Num. 2

Num. 5 Pb(OH) 2 + HCl  H 2 O + PbCl 2 ReactantsProducts

AlBr 3 + K 2 SO 4  KBr + Al 2 (SO 4 ) 3 ReactantsProducts Num. 6

TOD 1. Cu + O > Cu 2 O 2. H 2 + O > H 2 O 3. Mg + P 4 ---> Mg 3 P 2 4. H 2 SO 4 + NaOH ----> H 2 O + Na 2 SO 4 5. CaCl 2 + AgNO > AgCl + Ca(NO 3 ) 2 Don’t forget WOD tomorrow!

y/How-to-Balance-Chemistry- Equations.htm How does the Law of Conservation of Mass/Matter apply to balancing chemical equations?

PRACTICE

QUIZ Time! Complete 1 to 10

Have Your Homework Out With 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! CH 3 COOH + NaHCO 3 -> H 2 O + NaOCOCH 3 + CO 2

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 2H 2 + O 2  2H 2 O

Decomposition Complex compounds broken down into simple ones ABC  A + B + C CH 3 OH  CO + 2H 2

Single Replacement One atom switched place with another AB + C  AC + B 2Al + 3 CuCl 2  2AlCl Cu

Double Replacement Two atoms switch AB + CD  AD + BC 2KI + Pb(NO 3 ) 2  KNO 3 + PbI 2

TOD: Complete the Practice Sheet Turn in to Ms. Weis and get another balancing sheet! Quiz tomorrow over everything in unit. Balancing Review – 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