Lab 2Prelab Practice Questions_Factors Affecting Rates_2020

Factors Affecting the Rates of Reactions (CH 2) CHM 11600 Prelab Practice Questions As part of your individual preparation for lab, read the experiment and answer the following questions. (Your answers will not be collected or graded.) You will take a quiz on Blackboard related to these practice questions. The quiz is due at YOUR lab start time. 1. What two factors affecting the rates of chemical reactions will you investigate in this experiment? 2. Explain the meaning of the term “rate - determining step.” Write the chemical equation for the rate-determining step in the process you will study in lab. 3. Write the balanced molecular equation for the reaction of sodium metabisulfite (Na 2 S 2 O 5 ) with water to produce sodium bisulfite (NaHSO 3 ) and then write the net ionic equation for this reaction. Why is sodium bisulfite prepared using this method? 4. In your examination of the effect of concentration on reaction rate in Part I, for which species will the concentration be constant and for which species will the concentration vary? 5. Explain how you will measure the volume of Solution B in each of the trials in Part I. List the rest of the steps in the procedure for Part I. 6. Explain how and at what point you will measure the temperature of the reactions in Part II. 7. List the steps, in order, that you will perform in Part I, Trial 1A. 8. Calculate the number of moles of KIO 3 and NaHSO 3 present initially in Part I, Trial 5 (i.e. the mixture produced by combining 10.0 mL of Solution B, 6.0 mL of Solution A, and 4.0 mL of water). 9. Calculate the initial concentrations of KIO 3 and NaHSO 3 present in the reaction mixture in Part I, Trial 5 (i.e. the mixture produced by combining 10.0 mL of Solution B, 6.0 mL of Solution A, and 4.0 mL of water). 10. Review the MSDS for potassium iodate (KIO 3 ) and sodium metabisulfite (Na 2 S 2 O 5 ), which can be found at the links below. Summarize the safety hazards (health, fire, reactivity) associated with KIO 3 and Na 2 S 2 O 5 in your own words. https://beta- static.fishersci.com/content/dam/fishersci/en_US/documents/programs/education/regulatory- documents/sds/chemicals/chemicals-p/S25492.pdf Sodium metabisulfite MSDS_Sigma Aldrich