Today's Agenda .f 1/7/11 Recall – Predicting and classifying chemical reactions. Get your comp books out before the bell rings Correct problems 3 + 4 from the Stoichiomtry worksheet in your notebook Homework: problems 5 + 6 on Stoichiomtry worksheet in your notebooks. 4/21/2017 http://teachers.yourhomework.com/blowe/ 1 1

Quiz Reminder Quiz next Tuesday 1/11/11 4/21/2017

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 http://teachers.yourhomework.com/blowe/ 3

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 http://teachers.yourhomework.com/blowe/ 4 4

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

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 = 142.82 1.5 x 70.9 = 106.35 36.5 24.31+ 2(35.45) =95.21 2(35.45) =70.9 24.31 4/21/2017

Problem 3 on Stoichiomtry WS Final answers are: 142.82 g of MgCl2 36.5 g of Mg 106.35 g of Cl2 4/21/2017

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

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 159.82 = 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

Problem 4 on Stoichiomtry WS Final answers are: 14.18 g of Cl2 41.16 g of NaBr 23.38 g of NaCl 31.96 g of Br2 4/21/2017

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

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

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

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 http://teachers.yourhomework.com/blowe/ 14