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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. 4/21/2017 1 1
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Quiz Reminder Quiz next Tuesday 1/11/11 4/21/2017
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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 4/21/2017 3
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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 12/13/10 4 4
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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 4/21/2017
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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 4/21/2017
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Problem 3 on Stoichiomtry WS
Final answers are: g of MgCl g of Mg g of Cl2 4/21/2017
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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 4/21/2017
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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 4/21/2017
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Problem 4 on Stoichiomtry WS
Final answers are: g of Cl g of NaBr g of NaCl g of Br2 4/21/2017
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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. 4/21/2017
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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 4/21/2017
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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 4/21/2017
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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 4/21/2017 14
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