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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

Quiz Reminder

Quiz next Tuesday 1/11/11

04/19/23

Recall

Balance the following Chemical Reactions:

• C2H2 + O2 CO2 + H2O

• Fe(OH)2 + H2O2 Fe(OH)3

• FeS2 + Cl2 FeCl3 +S2Cl2

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• 2C2H2 + 5O2 4CO2 + 2H2O

• 2Fe(OH)2 + H2O2 2Fe(OH)3

• 2FeS2 + 5Cl2 2FeCl3 +2S2Cl2

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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

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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

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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)

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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

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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

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Cl2 + 2NaBr 2NaCl + Br2

Balanced?No

Problem 4 on Stoichiomtry WS

Moles(mol)

Mass(g)

Molar Mass(g/mpl)

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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

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Problems 5 & 6Have 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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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

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(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

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AlCl3 + Pb(NO3)2 Al(NO3)3 + PbCl2

Balanced?No

2AlCl3 + 3Pb(NO3)2 2Al(NO3)3 + 3PbCl2

HomeworkComplete 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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