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Experiment 23 Advance Study Assignment: Determination of the Equilibrium Constant for a Chemical Reaction A student mixes 5.00 mL 2.00 × 10-"M FeNO), in l M HNO, with 3.00 mL 2.00 x 10-1 M KSCN and 2.00 mL of water. She finds that in the equilibrium mixture the concentration of FeSCN2+ is 7.0 × 10 Find K. for the reaction Fee (aq) + SCN-(aq)·n FSC02+ (aq). 1. 5 M. Step 1 Find the number of moles Fe and SCN" initially present. (Use Eq. 3.) IL 1moles Femoles SCN Step 2 How many moles of FeSCN are in the mixture at equilibrium? What is the volume of the equi- librium mixture? (Use Eq. 3.1 IL How many moles of Fe and SCN" are used up in making the FeSCN+ Step 3 How many moles of Fe" and SCN remain in the solution at equilibrium? (Use Eq. 4 and the results of Steps I and 2.) Step 4 What are the concentrations of Fe", SCN , and FeSCN at equilibrium? (Use Eq. 3 and the results of Step 2 and Step 3.) OIL 0.01L 001L Step 5 What is the value of K, for the reaction? (Use Eq. 2 and the results of Step 4) x 10 5 (9.3 x 0.9(53 x K,-142 142.6 ) (continued on following page) 94 Experiment 23 Detemination 2. Opsional Assume that the reaction studied in Problem 1 isFe (aq)+2 SCN (aq) of the Equilibrium Constant for a Chemical Reaction e(SCN), "(aq) Find K, for this reaction, given the data in Problem I. Formulate the expression for K, for the alternate reaction just cited. b Find K, as you did in Problem I: take due account of the fact that two moles SCN are used up per mole Fe(SCN) formed as you carry out the following calculations: Step 1 Results are as in Problem 1 Step 2 How many moles of Fe(SCN) are in the mixture at equilibrium? (This will be the same as in Problem 1.) moles Fe(SCN)2 How many moles of Fel" and SCN are used up in making the FerSCN),"7 moles Fe"; moles SCN Step 3 How many moles of Fe3 and SCN remain in solution at equilibrium? Use the results of Steps 1 and 2, noting that moles SCN at equilibrium original moles SCN -(2 X moles Fe(SCN)2) moles Fe";moles SCN Step 4 What are the concentrations of Fe, SCN. and Fe(SCN)2 at equilibrium? (Use Eq. 3 and the results of Step 3.) M: [Fe(SCN)2+1- M Step 5 Calculate K, based on the assumption that the alternate reaction occurs.(Use the answer to Part 2a.)

Laboratory Review 5 I. How is "produces" represented in a chemical reaction? 2. Are the substrates in an enzymatic reaction reactants or products? 3. What is the name of the location on an enzyme where its substrate or substrates bind? 4. What cellular organelle contains catalase and is present in all plant and animal organs? S. What did measuringthe bubble column heights i al th experimental procedures indicate? 6. What purpose did the tube containing water and hydrogen peroxide serve in the catalase activity experimental procedure? 7. What word describes the loss of an enzyme's original shape and ability of its active site to function? 8. What happens to enzyme activity if the temperature increases slightly? 9. What did the negative control tube lack when the effect of enzyme concentration was studied? 10. If cells produce more catalase, will there be more or less water and oxygen produced from the breakdown of hydrogen peroxide by catalase? 11. What word describes the pH at which the speed of a reaction involving an enzyme 12. What do changes in pH (too low or too high) do to an enzyme that reduce its activity? 13. In the Experimental Procedure on the effect of pH on enzyme activity, which tube 14. Since enzymes are specific for certain substrates and often have similar names, what occurs best? contained water with an acidic pH? is the name of the enzyme used in tube 3 of the catalase activity experiment that facilitates the breakdown of sucrose? racilitates the breakdown of sucrose? Thought Questions 15. People with Crohn's disease may develop lactose intolerance caused by damage to their small intestine. These people may take a commercial product called Lactaid to prevent digestive upset when consuming dairy products What is in Lactaid about the specificity of enzymes for substrates in this lab. that helps these people avoid those symptoms? Explain how this relates to what you learned 16. High-grade fevers (in humans, 103°F or higher) are of concern, and medical care should be obtained. Explain why, based on your understanding of enzyme function. creatic amylase is a digestive enzyme that digests starch in the small intestine. Pancreatic amylase's optimum pH is slightly basic, which the presence of NaHČO, provides. Indicate which test tubes (1-3) would show digestion of starch following incubation. Explain why the others would not. Tube 1water, starch 17. Pan Tube 2 water, starch, pancreatic amylase, HCI Tube 3 water, starch, pancreatic amylase, NaHCO

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Lab 03-Lab Ticket Part 2" due Monday, Feb 11 at the beginning of Lab Part 1: Review of HW 3 and Lab 3 (Complete after HW 3 is due: attempt to do a first pass without additional help (only formula card and calculator) Facebook Friends: Based on a study of U.S. Facebook users in 2014, the most connected age group were Facebook users between 18 and 24 years, averaging 649 friends on the social media website. Assume the distribution for the number of Facebook friends for this age group is approximately normal with mean of 649 friends and a standard deviation of 150 friends. Based on the model, determine the value that would correctly complete the sentence below The top 15% of most connected Facebook users between 18 to 24 years will have at least a. riends Final Answer: at least friends Based on the model, what is the probability that a randomly selected Facebook user between 18 to 24 years has at least 844 friends? b. Final Answer Consider a random sample of 8 Facebook users between 18 to 24 years. What is the probability that exactly 3 of the 8 Facebook users will have at least 844 friends? c. Final Answer: