Chemical Reactions Putting it all Together Prepare for Recitation December 1st ALEKS Objective 13 due November 29th ANGEL Quiz 13 December 1st Lecture 37 November 16th Lecture 38 November 18th Thanksgiving Break Lecture 39 November 28th Read Ch 4 6 10 5 Reactions 5 3 5 7 8 8 Thermo Additional Preparation Packet Rxns 12 18 BLB 10 57 BLB 5 4 17 29 37 39 53 55 83 85 Packet 5 1 7 BLB 8 65a 67ac 92a 18 72ab 74 Packet 8 12 14 Did you miss an exam Download Make Up Request and make an appointment to see me CH110 FA11 SAS 1 Chemical Reactions Putting it all Together KEY QUESTIONS THE BIG PICTURE How do you determine the outcome of a chemical reaction How can I figure out how much of a reactant I have if I do not know Remember Chemistry deals with matter and its changes What does the equivalence point of a titration tell us about unknown concentrations of reactants What forces drive metathesis reactions to occur spontaneously What forces drive oxidation reduction reactions to occur spontaneously By the end of Today s Lecture you should know Titrations Exchange Reactions Metathesis Redox Reactions Net ionic equations and balanced molecular equations CH110 FA11 SAS 2 Titration Goal Method React solution of known concentration with solution of unknown concentration Find equivalence point Example add std soln of known HCl concentration soln of unknown NaOH concentration Find volume at equivalence point need way to signal the equiv point such as indicator CH110 FA11 SAS 3 Titration Example A flask contains an unknown amount of HCl This solution is titrated with 0 101 M NaOH It takes 23 35 mL of NaOH to complete the reaction How many grams of HCl were there HCl NaOH NaCl H2O 1 Find moles of NaOH used 2 Find moles of HCl 3 Find g of HCl If we knew the volume of HCl solution we could calculate the M of the HCl solution CH110 FA11 SAS 4 Practice Problem 25 0 mL of 0 100 M acetic acid solution is titrated with 0 200 M NaOH solution How many mL of the NaOH solution are required to reach the equivalence point A B C D E 6 25 mL 12 5 mL 25 0 mL 50 0 mL Cannot answer acetic acid is a weak acid CH110 FA11 SAS 5 Titration Demo How much 0 1 M NaOH will be required to titrate mL of 0 1M H2SO4 Inspecting the balanced equation H2SO4 2 NaOH Na2SO4 2 H2O we predict mL of NaOH per 1 mL H2SO4 How many moles of H were neutralized 1 Find moles of NaOH used 2 Find moles of H CH110 FA11 SAS 6 Complexation Reactions Ag NO3 2NH3 Ag NH3 2 aq NO3 aq Net ionic Equation Related to Acid Base Reactions cation acts similarly to an acid Electron rich molecule or anion ligand acts similarly to a base Metal ligand forms a complex CH110 FA11 SAS 7 Complexation Reactions Cu H2O 2 NH3 2 2 Cu H2O 2 en 2 2 Chelating Ligands Ex EDTA and ethylenediamine en shown below ethylenediamine en What is the net ionic equation for this ethylene diamine complexation CuCl2 aq 2 en aq Cu en 2Cl2 aq CH110 FA11 SAS 8 Review Problem Percent Yield To make SiCl4 a scientist combines 75 g each of SiO2 C and Cl2 which react as SiO2 s C s Cl2 g SiCl4 s CO g If 8 34 g of SiCl4 is produced what is the yield of the reaction CH110 FA11 SAS 9 Practice with Reactions Predict the products of this reaction NH4OH aq HClO4 aq Name the type of reaction Give the complete ionic or molecular equation If ionic provide the net ionic equation CH110 FA11 SAS 10 Practice with Reactions Predict the products of this reaction BaCl2 aq Na3PO4 aq Name the type of reaction Give the complete ionic or molecular equation If ionic provide the net ionic equation CH110 FA11 SAS 11 Practice with Reactions Predict the products of this reaction AI s Fe NO3 2 aq Name the type of reaction Give the complete ionic or molecular equation If ionic provide the net ionic equation CH110 FA11 SAS 12 Practice with Reactions Predict the products of this reaction C5H6O l O2 g Name the type of reaction Give the complete ionic or molecular equation If ionic provide the net ionic equation CH110 FA11 SAS 13 Review Problem What is the driving force for the reaction between NaOH and H2SO4 A Formation of a precipitate B Formation of a weak or nonelectrolyte neutralization C Formation of a gas D No reaction occurs so no driving force E I didn t remember that concept CH110 FA11 SAS 14 Review Problem What are the spectator ions when KCl and NaNO3 react A B C D E Na aq and Cl aq Na aq and NO3 aq K aq and Cl aq Na aq K aq and Cl aq K aq Na aq Cl aq and NO3 aq meaning no reaction occurs CH110 FA11 SAS 15 What You Should Know Titrations What is a standard solution How does a titration allow us to determine the unknown concentration of a reactant What is the equivalence point of a titration What is an indicator Metathesis Reactions What forces drive metathesis reactions How do net ionic equations help describe some metathesis reactions What is a spectator ion Redox Reactions What is an oxidizing agent A reducing agent What must be balanced in an oxidation reduction reaction How do oxidation numbers help us to balance redox reactions CH110 FA11 SAS 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