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