1. Today's Agenda .f 1/7/11
Recall – Predicting and classifying chemical reactions.
Get your comp books out before the bell rings
Correct problems from the Stoichiomtry worksheet in your notebook
Homework: problems on Stoichiomtry worksheet in your notebooks.
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2. Quiz Reminder
Quiz next Tuesday 1/11/11
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3. Recall Balance the following Chemical Reactions: C2H2 + O2  CO2 + H2O
Fe(OH)2 + H2O2  Fe(OH)3
FeS2 + Cl2  FeCl3 +S2Cl2
2C2H2 + 5O2  4CO2 + 2H2O
2Fe(OH)2 + H2O2  2Fe(OH)3
2FeS2 + 5Cl2  2FeCl3 +2S2Cl2
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4. Recall 2
State the type of Reaction, Predict the products and Balance the following Chemical Reactions:
Aluminum + Sulfur 
Aluminum + Oxygen 
Iron (III) oxide 
Al + S  Al2S3 Synthesis
Al + O2  Al2O3 Combustion and Synthesis
Fe2O3  Fe + O2 Decomposition
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5. Problem 3
Magnesium chloride can composed into magnesium and chlorine. Magnesium chloride is Mg2+ and Cl1- MgCl2 Magnesium is Mg Chlorine is Cl2
Why is it 2 again?
Because it’s a gas
Is this equation balanced?
YES!
MgCl2  Mg + Cl2
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6. Problem 3 on Stoichiomtry WS
MgCl2  Mg + Cl2
36.5 g of Mg
Moles
(mol)
Mass
(g)
Molar Mass
(g/mpl)
MgCl2 Mg Cl2
1.5 x
1.5 x
1.5 x 95.21 =
1.5 x 70.9 =
36.5
24.31+
2(35.45)
=95.21
2(35.45) =70.9
24.31
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7. Problem 3 on Stoichiomtry WS
Final answers are: g of MgCl g of Mg g of Cl2
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8. Problem 4 sodium chloride is Na1+ and Cl-1 NaCl Bromine is Br2
Chlorine reacts with sodium bromide to produce sodium chloride and bromine.
sodium chloride is Na1+ and Cl-1 NaCl Bromine is Br2
Chlorine is Cl2 Sodium Bromide is Na1+ and Br-1 NaBr
Balanced? No
Cl2 + NaBr  NaCl + Br2
Cl2 + 2NaBr  2NaCl + Br2
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9. Problem 4 on Stoichiomtry WS
Cl2 + 2NaBr  2NaCl + Br2
14.18 g of Cl2
Moles
(mol)
Mass
(g)
Molar Mass
(g/mpl)
Cl2 NaBr NaCl Br2 .2 .2 .2
.4 x 102.9
= 41.16
.4 x 58.44
= 23.38
.2 x
= 31.96
14.18
22.99+
79.91+
=102.9
22.99+
35.45
=58.44
2(35.45)
=70.9
2(79.91)+
=159.82
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10. Problem 4 on Stoichiomtry WS
Final answers are: g of Cl g of NaBr g of NaCl g of Br2
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11. Problems 5 & 6 Have a part a and part b
This means there should be 2 different tables for each question. 4 Tables in total.
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12. Start Problem 5 Ammonium sulfate reacts with sodium bromide
Now to predict the products. This is going to be a double replacement reaction
Ammonium Sulfate is NH41+ SO42- (NH4)2SO4 Sodium bromide is Na1+ NO31- NaNO3
(NH4)2S + NaBr  ? NH41+ Br1- + Na1+ S2- NH4Br + Na2S
(NH4)2SO4 + NaNO3  NH4Br + Na2S
Balanced? No
(NH4)2SO4 + 2NaNO3  2NH4Br + Na2S
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13. Start Problem 6 Aluminum chloride reacts with lead (II) nitrate
Now to predict the products. This is going to be a double replacement reaction
Aluminum chloride is Al3+ Cl1- AlCl3 lead (II) nitrate is Pb2+ NO3- Pb(NO3)2
AlCl3 + Pb(NO3)2  ? Al3+ NO3- + Pb2+ Cl1- Al(NO3)3 + PbCl2
AlCl3 + Pb(NO3)2  Al(NO3)3 + PbCl2
Balanced? No
2AlCl3 + 3Pb(NO3)2  2Al(NO3)3 + 3PbCl2
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14. Homework
Complete problems 5+6 from the Stoichometry worksheet in your comp notebook for a notebook stamp
You must include the 4 tables and correct numbers for credit
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