March 16, 2010 Complete the Warm up at your table

(Synthesis Table) Once you are done with the warm up, get

a packet from the front of the room Start the packet in class and finish it for

H/W Today we will be discussing:

“How do you recognize and represent chemical changes?”Homework:

Synthesis W/SImportant Dates:

4/2: Reaction Test

March 16, 2010 We will be taking the quiz first! Complete the Warm up at your table

(Balancing Reactions) You will need paper and something to

write with Today we will be discussing:

“How do you recognize and represent chemical changes?”

Homework:Single and Combustion. W/S

Important Dates:4/2: Reaction Test

Combustion

Combustion Reactions: Reactions in which oxygen combines with a

hydrocarbon molecule and releases energy in the form of heat and light

C3H6O(s) + 3O2(g) → 3CO2(g) + 3H2O(g) CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

Predicting Combustion Products

Products will ALWAYS be Carbon Dioxide and Water All reactants and Products will be gasses

C3H8(g) + O2(g) → CO2(g) + H2O(g)

Balancing Trick! 1. Balance the carbons using carbons subscript 2. Balance the hydrogens using hydrogens subscript/2 3. Add up all the oxygens on the product side.

Balance the oxygens using this number/2

Predicting Combustion Products

C3H8(g) + O2(g) → CO2(g) + H2O(g)

C3H8(g) + 10/2O2(g) → 3CO2(g) + 4H2O(g)

C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)

Balancing Trick! 1. Balance the carbons using carbons subscript 2. Balance the hydrogens using hydrogens subscript/2 3. Add up all the oxygens on the product side. Balance the

oxygens using this number/2

Combustion Practice

C8H16(g) + O2(g) → CO2(g) + H2O(g) C8H16(g) + 12O2(g) → 8CO2(g) + 8H2O(g)

C21H44(g) + O2(g) → CO2(g) + H2O(g) C21H44(g) + 32O2(g) → 21CO2(g) + 22H2O(g)

C6H14(g) + O2(g) → CO2(g) + H2O(g) C6H14(g) + 19/2O2(g) → 6CO2(g) + 7H2O(g) C6H14(g) + 19O2(g) → 12CO2(g) + 14H2O(g)

C3H6O(g) + O2(g) → CO2(g) + H2O(g) C3H6O(g) + 4O2(g) → 3CO2(g) + 3H2O(g)

Single Replacement

Single Replacement Reactions: A reaction in which the atoms of one element

replace the atoms of another element in a compound

AB + C → CB + A

Cu(S) + 2AgNO3(aq) → 2Ag(s) + Cu(NO3)2(aq)

F2(g) + 2NaBr(aq) → 2NaF(aq) + Br2(l)

Activation Series Lithium Rubidium Potassium Calcium Sodium Magnesium Aluminum Manganese Zinc Iron Nickel Tin Lead Copper Silver Platinum Gold

Fluorine Chlorine Bromine Iodine

Page 293

Single Replacement Products

3 basic types of single replacement reactions

1. Metal replaced by a more active metals

2. Hydrogen in acids replaced by active metals

3. Nonmetals replaced by more active nonmetals

4. Hydrogen in water replaced by a metal

Metal replaced by a more active Metals

MNM + AM → AMNM + M

Fe(s)  +  CuSO4(aq)  →    FeSO4(aq)  +  Cu(s)

Na(s) + SnCO3 → ? 2Na(s) + SnCO3 → Na2CO3 + Sn(s)

Pt(s) + Zn2O → ? Pt(s) + Zn2O → NR

Hydrogen in acids replaced by active metals

M(s) + HX → MX + H2(g)

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

Cu(s) + HNO3(aq) → Cu(NO3)2(aq) + H2(g) Cu(s) + 2HNO3(aq) → Cu(NO3)2(aq) + H2(g)

Na(s) + H2SO4(aq) → Na2SO4(aq) + H2(g) 2Na(s) + H2SO4(aq) → Na2SO4(aq) + H2(g)

Nonmetals replaced by more active nonmetals

NM(s,l,g) + MNM(aq) → MNM(aq) + NM(s,l,g)

Cl2(g) + 2NaBr(aq) → 2NaCl(aq) + Br2(l)

Br2(l) + MgI2(aq) → ? Br2(l) + MgI2(aq) → MgBr2(aq) + I2(s)

F2(g) + FeBr2(aq) → ? F2(g) + FeBr2(aq) → NR

Hydrogen in Water replaced by a Metal

M(s) + H2O(l) → M(OH)x(aq) + H2(g)

2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

Fe(s) + H2O(l) → ? Fe(s) + 2H2O(l) → Fe(OH)2(aq) + H2(g)

Sr(s) + H2O(l) → ? Sr(s) + 2H2O(l) → Sr(OH)2(aq) + H2(g)

Single Replacement Practice

Al(s) + H2SO4(aq) → ? 2Al(s) + 3H2SO4(aq) → 3H2(g) +

Al2(SO4)3(aq)

Br2(l) + MgI2(aq) → ? Br2(l) + MgI2(aq) → MgBr2(aq) + I2(s)

Zn(s) + H2O(l) → ? Zn(s) + 2H2O(l) → ZnOH(aq) +H2(g)

Ag(s) + CuCl2(aq) → ? Ag(s) + CuCl2(aq) → NR

Fe(s) + CuSO4 → ? Fe(s) + CuSO4 → FeSO4 +

Cu(s)

Br2(g) + KCl(aq) → ? Br2(g) + KCl(aq) → NR