Chem II Period: Objectives: I can understand why there are different degrees of so Distinguish between Aqueous Reactions

Chem II Period: 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: < M concentration of solute dissolved in solution. Slightly soluble: between M 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: 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 LEO: lose electron(s) oxidized GER: gain electron(s) reduced animals.nationalgeographic.com

Oxidation Reduction Reactions Also called Redox Reactions One reactant becomes oxidized (lose electrons) and one reactant becomes reduced (gains electrons). 2Ca + O > 2CaO Transfer of electrons from the oxidized reactant to the reduced reactant. Some Redox reactions can be spontaneous.

LEO goes GER LEO: lose electron(s) oxidized GER: gain electron(s) reduced animals.nationalgeographic.com

Redox Reactions Ex. Ca + O > 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.

Chem II Period: 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.

Oxidation Numbers Use the oxidation number rules on pg. 591 to assign oxidation numbers to each element in the substances below: a.H 2 b.Cu c.Fe 2 O 3 d.N 2 O 5 e.H(NO 3 ) f.CCl 4 g.OF 2 h.Ca(OH) 2

Assign Oxidation # to each element a.SO 2 b.COCl 2 c. (MnO 4 ) - : d. H(BrO): *(BrO) 1- =hypobromite ion e.As 4 f. K 2 (O 2 ): *O 2 = peroxide ion

Assign Oxidation # to each element a.SO 2 b.COCl 2 c. (MnO 4 ) - : d. H(BrO): *(BrO) 1- =hypobromite ion e.As 4 f. K 2 (O 2 ): *O 2 = peroxide ion

Chem II Period: 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 + Cl > NaCl KClO > KCl + O 2 NaCl + Ag(NO 3 ) > AgCl + Na(NO 3 )

Chem II Period: 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.

Balancing Redox Reactions: Acidic Solutions Cu (s) + NO 3 - (aq) ----> Cu 2+ (aq) + NO 2 (g)

Chem II Period: Infinite Campus Update: Redox Practice Problems Bell Ringer (5pts.) Redox open-note quiz (14pts.) Homework: Struggling with oxidation numbers: (redox quiz returned) a.Read oxidation rules and give an example of each. b.Corrections/complete Redox Quiz c.Redox Reaction Worksheet: Assign oxidation numbers to reactions in acidic solution. Comfortable with oxidation numbers (100% quiz) a. Redox Reaction Worksheet: Establish half reactions using oxidation numbers and balance each half-reactions following rules. I can balance redox reactions.

Chem II Period: Infinite Campus Update: Redox Practice Problems Bell Ringer (5pts.) Redox open-note quiz (14pts.) Homework: Struggling with oxidation numbers: (redox quiz returned) a.Read oxidation rules and give an example of each. b.Corrections/complete Redox Quiz c.Redox Reaction Worksheet: Assign oxidation numbers to reactions in acidic solution. Comfortable with oxidation numbers (100% quiz) a. Redox Reaction Worksheet: Establish half reactions using oxidation numbers and balance each half-reactions following rules. I can balance redox reactions.

Chem II Period: Due: Redox Reaction Open-Note Quiz due Objectives: I classify the half reactions in a redox reaction using oxidation numbers. I can balance redox reactions. Homework: Acidic Redox Reactions-Balance them

Balancing Redox Reactions: Acidic Solutions Cu (s) + NO 3 - (aq) ----> Cu 2+ (aq) + NO 2 (g)

Chem II Period: 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) + NO 3 - (aq) ----> Cu 2+ (aq) + NO 2 (g)

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: Objectives: I classify half reactions in a redox reaction using oxidation numbers. I can balance redox reactions in acidic and basic solutions. Homework: Acidic and Basic Redox Reactions-Balance them

Balance Redox Reactions in Acidic Solution Gallery Walk: Assess your work and then rotate and assess two other groups work. (check key) Modify your steps for balancing redox reactions in acidic solution if necessary.

Balancing Redox Reactions: Basic Solutions Cu (s) + NO 3 - (aq) ----> Cu 2+ (aq) + NO 2 (g)

Chem II Period: Objectives: I classify half reactions in a redox reaction using oxidation numbers. I can balance redox reactions in acidic and basic solutions. I can apply stoichiometry to balanced reactions. Homework: Acidic and Basic Redox Reactions-Balance them Stoichiometry Worksheet Quiz Thurs. over balancing and stoichiometry

Balancing Redox Reactions: Basic Balancing Redox Reactions in Basic Solutions

Chem II Period: Objectives: I can classify half reactions in a redox reaction using oxidation numbers. I can balance redox reactions in acidic and basic solutions. I can apply stoichiometry to balanced reactions. Homework: Acidic and Basic Redox Reactions-Balance them Quiz Thursday: Balancing Redox Reactions(basic/acidic)

Balance Redox Reaction: Basic Solution Establish Half-Reactions using Oxidation Numbers Assign Half-Reaction to balance(basic soln.) [H(O 2 )] - + Cr(OH) > CrO OH -

Balancing Redox Reactions Gallery Walk: Basic Soln. Complete/Check your redox reaction (basic) Review one other groups redox reaction

Chem II Period: Objectives: I can classify half reactions in a redox reaction using oxidation numbers. I can balance redox reactions in acidic and basic solutions. I can apply stoichiometry to balanced reactions. Homework: Acidic and Basic Redox Reactions-Balance them-due Fri. Quiz Friday: Balancing Redox Reactions(basic/acidic)

Redox Reactions Homework Balance (show work) 3 acidic and 3 basic problems from worksheet-due tomorrow. (includes gallery walk problems ) *Can check answers on back of wksht.* Redox Balancing Quiz tomorrow.

Redox Reactions Homework Balance (show work) 3 acidic and 3 basic problems from worksheet-due tomorrow. (includes gallery walk problems ) *Can check answers on back of wksht.* Redox Balancing Quiz tomorrow.

Stoichiometry Stoichiometry: Converting between substances in a balanced chemical equation using mole conversions.

Stoichiometry

Stoichiometry: Limiting Reactants Limiting Reactant: completely consumed Excess Reactant: partially consumed en.wikipedia.org

Balancing Reactions: Stoichiometry

Redox Reaction Lab

Redox Titration Lab Results Lab GroupAvg. volume of KMnO 4 Avg: % of H 2 O 2 in solution % Error H 2 O

Redox Reaction Lab: Due Thursday pre/post lab qts. complete Calculate percent error of H 2 O 2 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 H 2 O 2 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 H 2 O + NO Al(s) ----> NH AlO 2 - a.If we start with 3.8 moles of NO 2 - how many moles of AlO 2 - could be produced? b. If we want 13 grams of NH 4 + ion, how many grams of Al would we need to start with?

Redox Reactions: Percent Yield 2 H 2 O + NO Al(s) ----> NH AlO 2 - a.If we start with 3.8 moles of NO 2 - how many moles of AlO 2 - could be produced? If 7.0 moles AlO 2 - was actually produced in the lab, what would the percent yield be? b. If we want 13 grams of NH 4 + 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 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 GroupAvg. volume of KMnO 4 % of H 2 O 2 in Solution (Avg.) % Error H 2 O

Redox Reaction Lab: Extension Problem H 2 O 2 + K(MnO 4 ) + H 2 (SO 4 ) --> Mn(SO 4 ) + K 2 (SO 4 ) + O 2 + H 2 O Oxidized Element: O H 2 O > O 2 Reduced Element: Mn (MnO 4 ) > Mn 2+ Balanced Equation?

Redox Reaction Lab: Extension of Lab

Stoichiometry Worksheet

Chem II: Block Due: H 2 O 2 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 > MgCl 2 + H 2 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? ReactantsHave (moles)Need (moles)

Stoichiometry: Limiting Reactant 2HCl + Mg > MgCl 2 + H 2 1.If 6.8 moles of Mg react with 7.5 moles of HCl how many moles of MgCl 2 can be produced? ReactantsHave (moles)Need (moles) HCl (limited)7.5 mol13.6 Mg (excess)6.8 mol3.75

Redox Reactions and Stoichiometry Zn + (NO 3 ) > [Zn(OH) 4 ] 2- + NH 3 (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 (NO 3 ) - calculate the maximum amount of [Zn(OH) 4 ] 2- in grams that can be produced.

Redox Reactions and Stoichiometry Zn + (NO 3 ) > [Zn(OH) 4 ] 2- + NH 3 (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 (NO 3 ) - calculate the maximum amount of [Zn(OH) 4 ] 2- in grams that can be produced.

Redox Reactions and Stoichiometry Zn + (NO 3 ) > [Zn(OH) 4 ] 2- + NH 3 (basic solution)

Redox Reaction and Stoichiometry P + Cu > Cu + (H 2 PO 4 ) -

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 : 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) NO 2 - (aq) + Al(s) ----> NH 4 + (aq) + AlO 2 - (aq)

Balancing Complete Redox Reactions H 2 S + H(NO 3 ) -----> S + NO + H 2 O (acidic)

Redox Titration Lab H 2 O 2 + KMnO 4 + H 2 (SO 4 )  Mn(SO 4 ) + K 2 (SO 4 ) + O 2 + H 2 O 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) NO 2 - (aq) + Al(s) ----> NH 4 + (aq) + AlO 2 - (aq)

Stoichiometry 2 H 2 O + NO Al(s) ----> NH AlO 2 -

Balanced Redox Reactions (Basic) 2 H 2 O + NO Al(s) ----> NH AlO 2 - a.If we start with 3.8 moles of NO 2 - how many moles of AlO 2 - could be produced? b. If we want 13 grams of NH 4 + ion, how many grams of Al would we need to start with?

Chemistry Midterm Exam

#18. Mn 2+ (aq) + Na(BiO 3 ) (s) ---> Bi 3+ (aq) + MnO 4 -

Chemistry Midterm Exam #19. Cr(OH) 3 (s) + ClO - (aq) ---> ( CrO 4 ) 2- (aq) + Cl 2 (g)

Redox Titration Lab

Redox Titration Lab H 2 O 2 + KMnO 4 + H 2 (SO 4 )  Mn(SO 4 ) + K 2 (SO 4 ) + O 2 + H 2 O 5H 2 O 2 + 2KMnO 4 +3H 2 (SO 4 )  2Mn(SO 4 ) +K 2 (SO 4 ) + 5 O 2 + 8H 2 O

Redox Titration Lab Results Lab GroupAvg. volume of KMnO 4 Avg: % of H 2 O 2 in solution % Error % 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.