аЯрЁБс;ўџ ўџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ§џџџўџџџ ўџџџўџџџўџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџRџџџџџџџџ РF€ д<ђЛО€CompObjџџџџџџџџџџџџ\WordDocumentџџџџџџџџb%ObjectPoolџџџџ€ д<ђЛО€ д<ђЛОўџџџ ўџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџўџџџџџ РFMicrosoft Word 6.0 DocumentўџџџNB6WWord.Document.6;џў ўџ ђŸ…рOљhЋ‘+'Гй0Ѓ˜ь& , 8 DPX `l‰ ‘›џџџџџџџџLScience F:Applications:Microsoft Office:Microsoft Word 6:Templates:chem labLAB: TITLE OF LABsciencescience'@V–AьЛО@FиёЛО@вŸђЛОмЅhOР e"b%<х"о"оо"о"о"о"о"4V#V#V#V#V#n#~#V#6$Vš#š#š#š#š#а#а#а#$$$$$$$&Œ$Xф$~6$о"а# š#6а#а#а#6$а#о"о"š#š#а#а#а#а#о"š#о"š#$# #6о"о"о"о"а#$а#>а#Lab: Rates of Chemical Reactions  Introduction The rate of a chemical reaction is affected by changes in concentration of reactants, changes in temperature and the addition of a catalyst. The reaction you will be investigating involves two solutions. Solution A is a mixture of KI (a source of iodide ions) and Na2S2O3 (a source of S2O32- ions). This solution also contains starch as an indicator. Solution B contains ((NH4)2S2O8 (a source of S2O82- ions). The overall reaction you will be timing is: 2I- + S2O82- -> I2 + 2SO42- (slow) As I2 is formed in the reaction, the S2O32- immediately breaks up the I2 to form I-. When all of the S2O32- is consumed, then the I2 can remain in solution and react with the starch to form a deep blue color to signal the end of the reaction. In Part I of the experiment you will vary the concentration of B to see the effect of varying concentration on the rate of the reaction. In Part II, you will vary the temperature and in Part III you will add a catalyst. MATERIALS: solution A 2 10-mL graduated cylinders solution B 6 small test tubes 3 50- mL beakers warm water bath clock ice thermometer 0.01 M CuSO4 Procedure PART I 1. Measure out 5 mL of solution A in one graduated cylinder. Measure out 5 mL of solution B in another graduated cylinder. 2. Have your partner set to time the reaction. On signal, quickly pour the two solutions together in a 50 mL beaker which should be standing on a piece of white paper. Swirl the mixture. Time how long it takes for the deep blue color to appear and record that time in your data table. Also record the temperature of this reaction. 3. Measure out another 5 mL of solution A. Measure out 2.5 mL of solution B in the second cylinder. Add enough water to solution B to make a total volume of 5 mL. Have your partner ready to time and again pour the two solutions together and time. Record the time. 4. Measure 5 mL of solution A. Measure out 1.0 mL of B and add enough water to soution B to make a total of 5 mL. Again pour the two solutions together and time the reaction. Record the time. PART II 5. In this part of the experiment you will examine the time of the reaction at three different temperatures. Since the first reaction will involve 5 mL of each solution and be at room temperature, the results from #2 for time can be recorded in this section as your first piece of data. 6. Meaure out 5 mL of solution A in a graduated cylinder. Transfer this to a small test tube. Do the same for solution B. Hold the two test tubes in an ice bath until the temperature inside the small test tubes is about 10o below room temperature. When this temperature has been reached, pour the two solutions together in a 50 mL beaker and record the time and the temperatue in the data table. 7. Repeat step 6, only this time hold the two small test tubes in a warm water bath and wait for the the test tubes to reach a temperature about 10o above room temperature. Then pour the solutions together and record the time and temperatue of the reaction. PART III 8. Measure out 5 mL of solution A and 5 mL of solution B in their respective graduated cylinders. Add 2 drops of 0.01 M CuSO4 to the 50 mL beaker. Pour the two solutions into the 50 mL beaker and record the time of the reaction. 9. Clean up your materials. Data VOLUME SOLUTION AVOLUME SOLUTION BTEMPERATURE oCTIME (S)PART I5.O mL5.0 mL5.0 mL2.5 mL5.0 mL1.0 mLPART II5.0 mL5.0 mL5.0 mL5.0 mL5.0 mL5.0 mLPART III5.0 mL5.0 mL Analysis 1. According to your results in Part I, what is the effect of decreasing the volume of solution B on the reaction rate? 2. Express, in terms of ratio, the change in reaction rate due to a 10 degree change in temperature. 3. What effect did the addition of 2 drops of 0.01 M copper sulfate? KINETICS Name: _______________________ Partner #1: _______________________ Partner #2: _______________________ Acton-Boxborough Regional High School Due Date: ______________________ Acton-Boxborough Regional High School Ž™ І Ї ЈаЉа|HHк(џсџсљEG(ќHHк(d'`ŽžІ Ї ЈаЉа|HHк(џсџсљEG(ќHHк(d'`Ž™ І Ї ЈаЉа|HHк(џсџсљEG(ќHHк(d'`00&фј)Љ3Ј3(00&ќљйи00&ќљЁйи00&ќљйи00&ќљŽйиаЯрЁБс;џў SummaryInformation(џџџџџџџџџџџџгџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ@Microsoft Word 6.0.19;џў џџџўџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ !"#$2@ABCDETUVWYЏБВГДЕЖЗЦЧШЩЫ()*:;\]^_a}~žŸ ЂКЛЃЄІЇБ\ ] Ÿ $VW;<DЎгјњєьъьъчъчъчъчъчфъчъчъчъчъчъчфъчъчфъчъчфъчъчъчфъчъчъчфъчъчълиъфъфъьъфъьъгЮЮU]cU]cU]uDU]a]h]h]uD]a UZ]c( UZ]c(Q!"Пўu!#12ЁСТ56*+ =\‹ЅІБИ4ƒ  R Z { џ$%&ў$Ьў$мќ$,ќ$,ў$мў$мў$мў$мў$мў$мў$мў$мў$мў$мў$мў$мў$мў$мў$мў$мў$мў$мў$мў$мї$мїђрмђрмђрмђрмђрмђрмђ рмђрмђрмђрмђрмђэќ$,ў$мъЃмђўђўh˜ў*&8JYbcjryz{|}…ŒŽ˜Ÿ ЁЂЊВЙКЛМНХЬЭЮЯаипрстќЃмќЃмќЃмќЃмшЃмхЃмќЃмќЃмхЃмхЃмшЃмхЃмќЃмќЃмхЃмхЃмшЃмхЃмќЃмќЃмхЃмхЃмшЃмхЃмќЃмќЃмхЃмхЃмшЃмхЃмќЃмќЃмхЃмхЃмшЃмхЃмќЃмќЃмхЃмхЃмшЃмИlЛ О”џŠ€ћ$)тыѓњћќ§ўџ w‡ˆ‰Š‹Œёђѓєѕі<cˆ­Ў§ЃмљЃмљЃм§Ѓм§ЃмхЃму$му$му$му$му$му$мс$,с$,м$мм$мм$мм$мм$мм$мм$мм$мм$мм$мм$мм$мм$мм$мЭР$TРу Іџh рР!sžІџ0§h рР!sžh˜ўИlЛ О”џŠ€ћ$ Ўѕіїј !"ѕѓёѓѕѓѓь$мh˜ў 0§ рР!lЦK@ёџNormal]a "A@ђџЁ"Default Paragraph Font @ђ Header рР! @ Footer рР!*ўO"* Chem HeaderLџ UZ]cИ " " 4 А Х A SџџџџИ  $ "rКМфчП &тЎ" !#І "Яџ/_>science3Science F:Teacher Folders:Murphree:IODINE CLOCK RXNџ@ €    >шVMTimes New Roman Symbol MArial MTimesMNew Century Schlbk"1ˆаhmЋ6&›Ћ6&™Ћ6& *ƒ!~KScience F:Applications:Microsoft Office:Microsoft Word 6:Templates:chem labLAB: TITLE OF LABsciencescienceаЯрЁБс;џў џџџўџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ