Chem II Period: 10.30.14
Objectives:
• I can understand why there are different degrees
of so
• Distinguish between Aqueous Reactions
Chem II Period: 11.03.14
Reminder:
Replacement Labs(single/double)-LATE
Objectives:
• I can understand why aqueous compounds have
different degrees of solubility.
• I can distinguish between three types of Aqueous
Reactions
• I can understand how to assign oxidation
numbers to substances in a reaction.
Solubility Ranges
• Soluble: > 0.1M concentration of solute dissolved
in solution.
• Insoluble: < 0.0001M concentration of solute
dissolved in solution.
• Slightly soluble: between 0.0001M and 0.1 M of
solute dissolved in solution.
Double Replacement Reactions
*Why is it ionic compounds differ in the degree of
solubility with water? Use the image below to
come up with an educated guess.
Aqueous Reactions
Aqueous Reactions are reactions that occur in
solution.
Aqueous Reactions:
1. Replacement Reactions
2. Oxidation-Reduction (Redox) Reactions
3. Acid-Base Reactions
*Distinguish between the three types of reactions
above that occur in solution.
Chem II Period: 11.05.14
Infinite Campus Update:
• Chemical Reaction Exam (38pts.)
Objectives:
• I can understand why aqueous compounds have
different degrees of solubility.
• I can distinguish between three types of Aqueous
Reactions
• I can understand how to assign oxidation
numbers to substances in a reaction.
Aqueous Reactions
Aqueous Reactions are reactions that occur in
solution.
Aqueous Reactions:
1. Replacement Reactions
2. Oxidation-Reduction (Redox) Reactions
3. Acid-Base Reactions
*Distinguish between the three types of reactions
above that occur in solution.
Oxidation Reduction Reactions
Oxidized-Reduction Reactions
LEO goes GER
animals.nationalgeographic.com
LEO: lose electron(s) oxidized
GER: gain electron(s) reduced
Oxidation Reduction Reactions
•Also called Redox Reactions
•One reactant becomes oxidized (lose electrons) and
one reactant becomes reduced (gains electrons).
2Ca + O2 -----> 2CaO
• Transfer of electrons from the oxidized reactant to
the reduced reactant.
• Some Redox reactions can be spontaneous.
Chem II Period: 10.19.15
Objectives:
• I can classify, predict, and balance chemical
reactions. (Quiz Tomorrow)
• I can understand how to assign oxidation
numbers to substances in a reaction.
Chemical Reactions
LEO goes GER
animals.nationalgeographic.com
LEO: lose electron(s) oxidized
GER: gain electron(s) reduced
Chem II Period: 10.23.15
Due:
Redox Reaction Worksheet: qst.1-2
Objectives:
• I can assign oxidation numbers to substances in a
reaction.
• I can classify reactions as redox reactions.
• I can distinguish between the oxidized and
reduced reactants.
• I can balance redox reactions
Oxidation Numbers
*Assign oxidation numbers to each element
below.
a. H2
b. Cu
c. Fe2O3
d. N2O5
e. H(NO3)
f. CCl4
g. OF2
h. Ca(OH)2
Redox Reactions
Ex.
Ca + O2 -----> CaO
How do you know which reactant is oxidized (LEO)
and which reactant is reduced (REO) in a redox
reaction?
*By assigning an oxidation number to each element in
the reaction.
Oxidation Numbers
*Assign oxidation numbers to each element
below.
a. H2
b. Cu
c. Fe2O3
d. N2O5
e. H(NO3)
f. CCl4
g. OF2
h. Ca(OH)2
Assign Oxidation # to each element
a. SO2
b. COCl2
c. (MnO4)- :
d. H(BrO): *(BrO)1- =hypobromite ion
e. H2
f. K2(O2 ): *O2 = peroxide ion
Assign Oxidation # to each element
a. SO2
b. COCl2
c. (MnO4)- :
d. H(BrO): *(BrO)1- =hypobromite ion
e. H2
f. K2(O2 ): *O2 = peroxide ion
Chem II Period: 11.07.14
Objectives:
• I can understand how to assign oxidation
numbers to substances in a reaction.
• I can classify reactions as redox reactions.
• I can distinguish between the oxidized and
reduced reactants.
• I can balance redox reactions.
Determining Redox Reactions
• Na + Cl2 ------> NaCl
• KClO3 ------> KCl + O2
• NaCl + Ag(NO3) ------> AgCl + Na(NO3)
Determining Redox Reactions
• Na + Cl2 ------> NaCl
• KClO3 ------> KCl + O2
• NaCl + Ag(NO3) ------> AgCl + Na(NO3)
Chem II Period: 11.10.14
Objectives:
• I can understand how to assign oxidation
numbers to substances in a reaction.
• I can classify reactions as redox reactions.
• I can distinguish between the oxidized and
reduced reactants.
• I can balance redox reactions.
Chem II Period: 11.11.15
Objectives:
• I can understand how to assign oxidation
numbers to substances in a reaction.
• I can classify reactions as redox reactions.
• I can distinguish between the oxidized and
reduced reactants.
• I can balance redox reactions.
Redox Practice Problems: Bell Ringer
• From qts. 2:
Give an example of an oxidation half-reaction and a reduction half
reaction from qts. 2.
• From qts. 3:
a. Identify a reaction that is one and one that is not a redox reaction.
Validate it with oxidation numbers.
b. The reaction above that is redox, identify which reactant is oxidized
and which is reduced.
Redox Practice Problems: Bell Ringer
• From qts. 2:
Give an example of an oxidation half-reaction and a reduction half
reaction from qts. 2.
• From qts. 3:
a. Identify a reaction that is one and one that is not a redox reaction.
Validate it with oxidation numbers.
b. The reaction above that is redox, identify which reactant is oxidized
and which is reduced.
Chem II Period: 10.26.15
Objectives:
• I can understand how to assign oxidation
numbers to substances in a reaction.
• I can classify reactions as redox reactions.
• I can distinguish between the oxidized and
reduced reactants.
• I can balance redox reactions.
Balancing Redox Reactions: Acidic Solutions
Cu (s) + NO3- (aq) ----> Cu2+ (aq) + NO2 (g)
Balancing Redox Reactions: Acidic Solutions
Cu (s) + NO3- (aq) ----> Cu2+ (aq) + NO2 (g)
Chem II Period: 10.27.15
Objectives:
• I can understand how to assign oxidation
numbers to substances in a reaction.
• I can classify reactions as redox reactions.
• I can distinguish between the oxidized and
reduced reactants.
• I can balance redox reactions.
Chem II Period: 11.12.14
Infinite Campus:
• Open-Note Redox Reaction Quiz (14pts.)
Objectives:
• I classify half reactions in a redox reaction using oxidation
numbers.
• I can balance redox reactions in acidic and basic solutions.
Homework:
• Acidic Redox Reactions-Balance them.
Balancing Redox Reactions: Acidic Solutions
Cu (s) + NO3- (aq) ----> Cu2+ (aq) + NO2 (g)
Chem II Period: 10.29.15
Objectives:
• I can understand how to assign oxidation
numbers to substances in a reaction.
• I can classify reactions as redox reactions.
• I can distinguish between the oxidized and
reduced reactants.
• I can balance redox reactions. (Basic/Acidic)
*Redox Quiz-tomorrow
Redox Reactions:Basic Solutions
• Balance using acidic rules.
• Add OH ions to half-reactions.
• Combine half-reactions and simplify
Chem II Period: 10.30.15
Objectives:
• Redox Quiz
• I can understand how to assign oxidation
numbers to substances in a reaction.
• I can classify reactions as redox reactions.
• I can distinguish between the oxidized and
reduced reactants.
• I can balance redox reactions. (Basic/Acidic)
Homework:
Balancing Redox Enrichment Problems
Balancing Redox Reactions: Acidic Solutions
• Using the practice problem we just balanced as a model,
write down the steps you need to follow to correctly
balance a redox reaction in acidic solution.
Balancing Redox Reactions: Acidic Solutions
• Using the practice problem we just balanced as a model,
write down the steps you need to follow to correctly
balance a redox reaction in acidic solution.
• Check with a peer to validate that steps are accurate.
Chem II Period: 11.02.15
Objectives:
• Redox Quiz
• I can understand how to assign oxidation
numbers to substances in a reaction.
• I can classify reactions as redox reactions.
• I can distinguish between the oxidized and
reduced reactants.
• I can balance redox reactions. (Basic/Acidic)
Homework:
Balancing Redox Enrichment Problems
Balancing Redox Reactions: Basic Solutions
Cu (s) + NO3- (aq) ----> Cu2+ (aq) + NO2 (g)
Balancing Redox Reactions: Basic Solutions
Cu (s) + NO3- (aq) ----> Cu2+ (aq) + NO2 (g)
Balance Redox Reaction: Basic Solution
• Establish Half-Reactions using Oxidation Numbers
• Assign Half-Reaction to balance(basic soln.)
[H(O2)]- + Cr(OH)3 -----> CrO42- + OH-
Chem II Period: 11.04.15
Objectives:
• I can understand how to assign oxidation
numbers to substances in a reaction.
• I can classify reactions as redox reactions.
• I can distinguish between the oxidized and
reduced reactants.
• I can balance redox reactions. (Basic/Acidic)
Homework:
Redox Lab Tomorrow-work on Pre-Lab questions
Redox Titration Lab
H2O2 + KMnO4 + H2(SO4)  Mn(SO4) + K2(SO4) + O2 + H2O
5H2O2 + 2KMnO4 +3H2(SO4)  2Mn(SO4) +K2(SO4) + 5 O2+ 8H2O
Chem II Period: 11.09.15
Infinite Campus:
• Redox Quiz
Objectives:
• I can balance Redox Reactions
• Complete Redox Lab
• Homework:
Redox Lab-Work on Post-Lab Questions
Redox Quiz
Chem II Period: 11.10.15
Objectives:
• Complete/Assess Redox Lab
• Address Redox Quiz
• Homework:
Redox Lab-Complete Post-Lab Questions
Chem II Period: 11.11.15
Objectives:
• Complete/Assess Redox Lab
• Address Redox Quiz
• Homework:
Redox Lab-Complete Post-Lab Questions
Redox Titration Lab
http://www.webassign.net
Redox Titration Lab Results
Lab Group
1
2
3
4
5
Avg. volume
of KMnO4
Avg:
% of H2O2 in
solution
% Error
H2O2
Stoichiometry
Stoichiometry:
• Converting between substances in a balanced
chemical equation using mole conversions.
Mg + O2 ---------> MgO
www.larapedia.com
Stoichiometry
Stoichiometry:
• Converting between substances in a balanced
chemical equation using mole conversions.
Mg + O2 ---------> MgO
www.larapedia.com
Stoichiometry
2Mg + O2
-----> 2MgO
www.larapedia.com
Chem II Period: 11.25.14
Objectives:
• I can apply stoichiometry to balanced reactions.
• Review Redox Balancing quiz
Homework:
• Stoichiometry Practice Problems
• Review Redox Reactions
Stoichiometry
2Mg + O2
-----> 2MgO
www.larapedia.com
Stoichiometry: Limiting Reactants
• Limiting Reactant: completely consumed
• Excess Reactant: partially consumed
en.wikipedia.org
Balancing Reactions: Stoichiometry
Chem II Period: 12/01
Objectives:
• Review Redox Balancing quiz: make-up Wed.
• I can apply stoichiometry to balanced reactions.
Homework:
• Stoichiometry Practice Problems
• Review Redox Reactions
Redox Quiz
Stoichiometry
www.larapedia.com
Redox and Stoichiometry Exit Slip
• Complete the questions for the following halfreaction occurring in acidic solution:
Cr2O7 2- -------> Cr 3+
a. Explain how you know if Cr is being oxidized or
reduced?
b. Balance the half-reaction (acidic solution)
c. How many grams of Cr3+ is produced from 2.8
moles of Cr2O7 2- ?
Redox and Stoichiometry Exit Slip
• Complete the questions for the following halfreaction occurring in acidic solution:
C2H4O ------> C2H4(O2)
a. Explain how you know if O is being oxidized or
reduced?
b. Balance the half-reaction (acidic solution)
c. How many grams of C2H4(O2) is produced from
3.2 moles of C2H4O?
Chem II Period: 12/02
Objectives:
• Review Redox Balancing quiz: make-up Wed.
• I can apply stoichiometry to balanced reactions.
Homework:
• Stoichiometry Practice Problems due
• Redox Reaction Make-up Quiz
Stoichiometry
www.larapedia.com
Exit Slip Extension Questions
Extension Questions:
1. Take your balanced half-reaction and make it
basic.
Chem II Period: 12/03
Due: Stoichiometry Problems( six problems)
Objectives:
• Review Redox Balancing (gallery walk)
• I can apply stoichiometry to balanced reactions (gallery
walk)
Homework:
• Redox Reaction Make-up Quiz-Thursday
Exit Slip Extension Questions
Extension Question:
1. Partner up with someone who has a different
half-reaction. Add up your half-reaction
(make sure electrons balance out!); come up
with your final balanced redox reaction. 
Redox Reaction Review
• Gallery Walk: Need to complete a problem
and asses two other groups work.
• Record answers to validate productivity.
Chem II Period: 12/05
Infinite Campus Update:
• Stoichiometry Problem(12pts.)Many are LATE: turn in asap
• Redox Reaction Bell Ringer (Half-Reactions)-10pts.
Objectives:
• I can balance redox reactions (acidic or basic solutions)
• I can apply stoichiometry to balanced reactions
• I can calculate percent yield of a substance in a reaction.
Homework:
• Redox Reaction and Stoichiometry Test-Tues./Wed.
Stoichiometry and Percent Yield
1b. If you actually start with 0.5mol of NO3- ion, what
would the percent yield be?
2b. If 1.5 grams of Cr3+ is actually produced in the lab,
what would the percent yield be?
3b. If 2.18 grams of Fe(OH)3 is actually used, what
would the percent yield be?
4b. If 85 grams of Cu is actually produced, what would
the percent yield be?
Stoichiometry and Percent Yield
1b. If you actually start with 0.5mol of NO3- ion, what
would the percent yield be?
2b. If 1.5 grams of Cr3+ is actually produced in the lab,
what would the percent yield be?
3b. If 2.18 grams of Fe(OH)3 is actually used, what
would the percent yield be?
4b. If 85 grams of Cu is actually produced, what would
the percent yield be?
Stoichiometry and Percent Yield
Redox Reactions
Chem II Period: 12/09
Infinite Campus Update:
• Stoichiometry Problems(12pts.)Many are LATE: turn in
asap
• Stoichiometry Quiz-updated in IC today (higher score)
Objectives:
• I can balance redox reactions (acidic or basic solutions)
• I can apply stoichiometry to balanced reactions
• I can calculate percent yield of a substance in a reaction.
Homework:
• Redox Reaction and Stoichiometry Test-Wed./Thurs.
Stoichiometry and Percent Yield
Redox Reactions
Chem II Period: 12/10
Infinite Campus Update:
• Stoichiometry Problems(12pts.)Many are LATE: turn in
asap
• Stoichiometry Quiz-updated in IC today (higher score)
Objectives:
• Redox Reactions and Stoichiometry Test
• Distinguish between Acidic and Basic Properties
Homework:
• Redox Reaction and Stoichiometry-Test
• Acidic vs. Basic Properties Homework-due Thurs.
Redox Reaction Lab
Redox Titration Lab Results
Lab Group
1
2
3
4
5
Avg. volume
of KMnO4
Avg:
% of H2O2 in
solution
% Error
H2O2
Redox Reaction Lab: Due Thursday
• pre/post lab qts. complete
• Calculate percent error of H2O2 concentration
add to post-lab qts.
• Establish a conclusion-paragraph format
-addresses purpose of lab
-analysis and accuracy of your data/class’s data
-what did you learn from the lab
-modification(s) if could repeat lab
Redox Reaction Lab: Due Thursday
• pre/post lab qts. complete
• Calculate percent error of H2O2 concentration
add to post-lab qts.
• Establish a conclusion-paragraph format
-addresses purpose of lab
-analysis and accuracy of your data/class’s data
-what did you learn from the lab
-modification(s) if could repeat lab
Redox Reactions: Stoichiometry Applications
2 H2O + NO2- + 2Al(s) ----> NH4+ + 2AlO2a. If we start with 3.8 moles of NO2- how
many moles of AlO2- could be produced?
b. If we want 13 grams of NH4+ ion, how many
grams of Al would we need to start with?
Redox Reactions: Percent Yield
2 H2O + NO2- + 2Al(s) ----> NH4+ + 2AlO2a. If we start with 3.8 moles of NO2- how many
moles of AlO2- could be produced?
If 7.0 moles AlO2- was actually produced in the lab,
what would the percent yield be?
b. If we want 13 grams of NH4+ ion, how many grams
of Al would we need to start with?
If 34.8 g of Al was actually produced in the lab, what
would the percent yield be?
Percent Yield
• Percent Yield: (Actual/Theoretical) x 100
Chem II: Block 10.30.14
Due:
• Stoichiometry Problems
Objectives:
• I can classify reactions as redox reactions using oxidations
numbers.
• I can identify redox half-reactions. (oxidation/reduction)
• I can balance redox reactions. (acidic/basic solutions)
(Redox Reaction Lab pre/post lab qts.)
• I can apply stoichiometry to balanced chemical equations.
(Apply to Redox Reactions)
Homework:
• Redox Reactions and Stoichiometry Review
Redox Titration Lab Results
Lab Group
1
2
3
4
5
Avg. volume
of KMnO4
% of H2O2 in
Solution (Avg.)
% Error
H2O2
Redox Reaction Lab: Extension Problem
H2O2 + K(MnO4) + H2(SO4) --> Mn(SO4) + K2(SO4) + O2 + H2O
Oxidized Element: O
H2O2 -----> O2
Reduced Element: Mn
(MnO4)1- -----> Mn2+
Balanced Equation?
Redox Reaction Lab: Extension of Lab
Stoichiometry Worksheet
Chem II: Block 10.31.14
Due:
H2O2 Redox Lab Report
Objectives:
• I can classify reactions as redox reactions using oxidations
numbers.
• I can identify redox half-reactions. (oxidation/reduction)
• I can balance redox reactions. (acidic/basic solutions)
(Redox Reaction Lab pre/post lab qts.)
• I can apply stoichiometry to balanced chemical equations.
(Apply to Redox Reactions)
Homework:
• Redox Reactions Practice Problems Review-Test Monday
Stoichiometry: Limiting Reactant
HCl + Mg -------> MgCl2 + H2
1. What type of reactions is this?
2. Balance equation if needed.
3. If 6.8 moles of Mg react with 7.5 moles of HCl which is
considered the limiting reactant? excess reactant?
Reactants
Have (moles) Need (moles)
Stoichiometry: Limiting Reactant
2HCl + Mg -------> MgCl2 + H2
1.If 6.8 moles of Mg react with 7.5 moles of HCl how
many moles of MgCl2 can be produced?
Reactants
Have (moles) Need (moles)
HCl (limited)
7.5 mol
13.6
Mg (excess)
6.8 mol
3.75
Redox Reactions and Stoichiometry
Zn + (NO3)- -----> [Zn(OH)4]2- + NH3 (basic solution)
a. Assign oxidation numbers to establish half-reactions.
b. Balance half-reactions (basic solution) and combine for
full reaction.
c. If 4.2 grams of Zn reacts with 4.2 grams of (NO3)calculate the maximum amount of [Zn(OH)4]2- in grams
that can be produced.
Redox Reactions and Stoichiometry
Zn + (NO3)- -----> [Zn(OH)4]2- + NH3 (basic solution)
a. Assign oxidation numbers to establish half-reactions.
b. Balance half-reactions (basic solution) and combine for
full reaction.
c. If 4.2 grams of Zn reacts with 4.2 grams of (NO3)calculate the maximum amount of [Zn(OH)4]2- in grams
that can be produced.
Redox Reactions and Stoichiometry
Zn + (NO3)- -----> [Zn(OH)4]2- + NH3 (basic solution)
Redox Reaction and Stoichiometry
P + Cu2+ -----> Cu + (H2PO4)-
Chem II: 9/27
Objectives:
• I can balance redox reactions using half reactions in
acidic or basic solutions.
• Review Chemical Reaction Exam
Homework:
• Balance Redox Reactions (Acidic/Basic)
Balance Redox Reaction (acidic)
Balance using half reactions the following
reaction in acidic solution.
20.21: example d
Redox Reaction (basic solution)
Chem II: 9/30
Infinite Campus Update:
• Redox Classification Quiz -17pts
• Balance Redox Rxtn (acidic)-5pts
Objectives:
• I can balance redox reactions using half reactions in
acidic or basic solutions.
• Review Redox Reaction Quiz and Bell Ringer
• Review Chemical Reaction Exam
• Set-up Redox Lab (Use Buret for titration)
Homework:
• Balance Redox Reactions
Midterm Exam Concepts
• Molarity vs. Molalilty
• Classification of Mixtures (colloids, suspensions,
solutions)
• Assigning Oxidation Numbers to substances
• Identifying and Balancing Redox Reactions
• Stoichiometric Calculations with Redox Reactions
Balancing Redox Reaction (basic)
Gallery Walk:
Balancing Redox Reaction in basic solution.
Bell Ringer: Redox Reaction. (acidic)
Redox Classification Quiz
Chem II: 10/1
Objectives:
• I can balance redox reactions using half reactions in
acidic or basic solutions.
• Review Chemical Reaction Exam
• Set-up Redox Reaction Lab
Homework:
• Read procedures and complete pre-lab questions
Chemical Reaction Exam
Balancing Redox Reactions (Basic)
NO2- (aq) + Al(s) ----> NH4+ (aq) + AlO2- (aq)
Balancing Complete Redox Reactions
H2S + H(NO3) -----> S + NO + H2O (acidic)
Redox Titration Lab
H2O2 + KMnO4 + H2(SO4)  Mn(SO4) + K2(SO4) + O2 + H2O
Pre-Lab:
1. Practice reading and working stopper on Buret.
(Measure out 15 mL of water 3xs from buret, validate
volume with graduated cylinder.
2. Complete pre-lab questions from lab
Chem II: 10/2
Objectives:
• Complete and assess Redox Lab
Homework:
Complete Post Lab Questions
Chem II: 10/4
Objectives:
• Chemistry II Midterm
• Analyze Redox Reaction Lab
Homework:
Have a nice fall break. 
Chem II: 10/14
Infinite Campus Update:
• Balance Redox Reaction (Basic) Quiz
• Redox Lab: Hydrogen Peroxide Analysis (24pts.)
• Chemistry Midterm Exam (35pts.)
Objectives:
• Review Quiz and Midterm
• Address Redox Lab
• Electrochemistry : Redox Application
Balancing Redox Reactions (Basic)
NO2- (aq) + Al(s) ----> NH4+ (aq) + AlO2- (aq)
Stoichiometry
2 H2O + NO2- + 2Al(s) ----> NH4+ + 2AlO2-
www.larapedia.com
Balanced Redox Reactions (Basic)
2 H2O + NO2- + 2Al(s) ----> NH4+ + 2AlO2a. If we start with 3.8 moles of NO2- how
many moles of AlO2- could be produced?
b. If we want 13 grams of NH4+ ion, how many
grams of Al would we need to start with?
Chemistry Midterm Exam
Chemistry Midterm Exam
#18.
Mn2+ (aq) + Na(BiO3) (s) ---> Bi3+ (aq) + MnO4-
Chemistry Midterm Exam
#19.
Cr(OH)3 (s) + ClO- (aq) ---> ( CrO4)2- (aq) + Cl2 (g)
Redox Titration Lab
http://www.webassign.net
Redox Titration Lab
H2O2 + KMnO4 + H2(SO4)  Mn(SO4) + K2(SO4) + O2 + H2O
5H2O2 + 2KMnO4 +3H2(SO4)  2Mn(SO4) +K2(SO4) + 5 O2+ 8H2O
Redox Titration Lab Results
Lab Group
1
2
3
4
5
% Error:
Avg. volume
of KMnO4
Avg:
% of H2O2 in
solution
% Error
Redox Titration Lab Results
Conclusion:
1. a. How accurate was your experimental value
with the actual value of % hydrogen perxoide
in solution.
b. Explain reasons for degree error.
2. How accurate was the class’ data from one
another?
3. If you could repeat the lab what
modifications would you make and why.