http://teachers.yourhomework.com/blowe/ 1
Today's Agenda .f 1/7/11Recall – 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.
04/19/23
Recall
Balance the following Chemical Reactions:
• C2H2 + O2 CO2 + H2O
• Fe(OH)2 + H2O2 Fe(OH)3
• FeS2 + Cl2 FeCl3 +S2Cl2
http://teachers.yourhomework.com/blowe/ 3
• 2C2H2 + 5O2 4CO2 + 2H2O
• 2Fe(OH)2 + H2O2 2Fe(OH)3
• 2FeS2 + 5Cl2 2FeCl3 +2S2Cl2
04/19/23
Recall 2State the type of Reaction, Predict the products
and Balance the following Chemical Reactions:
1.Aluminum + Sulfur
2.Aluminum + Oxygen
3.Iron (III) oxide
http://teachers.yourhomework.com/blowe/ 412/13/10
Al + S Al2S3 Synthesis
Al + O2 Al2O3 Combustion and Synthesis
Fe2O3 Fe + O2 Decomposition
Problem 3
Magnesium chloride can composed into magnesium and chlorine.
Magnesium chloride is
Mg2+ and Cl1-
MgCl2Magnesium is Mg
Chlorine is Cl2
04/19/23
Why is it 2 again?
Because it’s a gas
MgCl2 Mg + Cl2
Is this equation balanced?YES!
Problem 3 on Stoichiomtry WS
Moles(mol)
Mass(g)
Molar Mass(g/mpl)
04/19/23
MgCl2 Mg + Cl2
24.31+2(35.45)=95.21
24.312(35.45) =70.9
36.5
€
36.5
24.31=1.51.5 x
€
1
1=1.5 1.5 x
€
1
1=1.5
1.5 x 95.21= 142.82
1.5 x 70.9= 106.35
36.5 g of Mg
MgCl2 Mg Cl2
Problem 3 on Stoichiomtry WS
Final answers are:
142.82 g of MgCl2
36.5 g of Mg
106.35 g of Cl2
04/19/23
Problem 4
Chlorine reacts with sodium bromide to produce sodium chloride and bromine.
Chlorine is
Cl2
Sodium Bromide is
Na1+ and Br-1
NaBr
Cl2 + NaBr NaCl + Br2
sodium chloride is
Na1+ and Cl-1
NaCl
Bromine is
Br2
04/19/23
Cl2 + 2NaBr 2NaCl + Br2
Balanced?No
Problem 4 on Stoichiomtry WS
Moles(mol)
Mass(g)
Molar Mass(g/mpl)
04/19/23
Cl2 NaBr NaCl Br2
22.99+35.45=58.44
22.99+79.91+=102.9
2(35.45)=70.9
2(79.91)+=159.82
14.18
€
14.18
70.9= .2 .2
€
⋅2
1= .4 .2
€
⋅2
1= .4 .2
€
⋅1
1= .2
.4 x 102.9= 41.16
.4 x 58.44= 23.38
.2 x 159.82= 31.96
14.18 g of Cl2Cl2 + 2NaBr 2NaCl + Br2
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
04/19/23
Problems 5 & 6Have a part a and part b
This means there should be 2 different tables for each question. 4 Tables in total.
04/19/23
Start Problem 5
Ammonium sulfate reacts with sodium bromideAmmonium Sulfate is
NH41+ SO4
2-
(NH4)2SO4
Sodium bromide is
Na1+ NO31-
NaNO3
Now to predict the products. This is going to be a double replacement reaction
(NH4)2S + NaBr ?
NH41+ Br1- + Na1+ S2-
NH4Br + Na2S
04/19/23
(NH4)2SO4 + NaNO3 NH4Br + Na2S
Balanced?No
(NH4)2SO4 + 2NaNO3 2NH4Br + Na2S
Start Problem 6
Aluminum chloride reacts with lead (II) nitrateAluminum chloride is
Al3+ Cl1-
AlCl3
lead (II) nitrate is
Pb2+ NO3-
Pb(NO3)2
Now to predict the products. This is going to be a double replacement reaction
AlCl3 + Pb(NO3)2 ?
Al3+ NO3- + Pb2+ Cl1-
Al(NO3)3 + PbCl2
04/19/23
AlCl3 + Pb(NO3)2 Al(NO3)3 + PbCl2
Balanced?No
2AlCl3 + 3Pb(NO3)2 2Al(NO3)3 + 3PbCl2