(c. 3 pts) Based on the class average data for your lab section determine the rate constants for each of the reactions studied (four room temperature runs, one cool and one ice). When using the orders from part b. round them off to the nearest whole number. Explain the steps in the process and show one sample calculation. Also an average rate constant for the four room temperature runs, for the cool report experiments and for the cold experiments. For the room temperature reactions include the numeric error ( {Type answer here including sample calculations and explanatory text as appropriate.} (Ignore this question) Based on the amount that you had to round off the orders to get to a whole number in going from part 2b to part 2c above, what does this tell you about the error in the experiment? What are some likely sources of error in this experiment? {Insert discussion here.} (4 points) Based on your data, how does the rate constant change with temperature? Why does it change in this way? {Insert discussion here.} (4 points) Using class data from the room temperature and variable temperature experiments calculate the value of the activation energy for this reaction using either the two-point form of the Arrhenius equation or the linear Arrhenius equation/graphical approach. Show a sample calculation using the two point method if relevant and include your graph used to determine activation energy using the graphical approach. {Insert fully labeled graph, sample calculations and answers here} Unsatisfactory Borderline Satisfactory Excellent Score Not using Correctly identified two Microsoft Equation trials within 10% of each or similar equation other. (0.5 pt) editor but stringing Calculations are correct Q #1 1 pts. out calculations in showing the two are lines of text and within 10% of each other numbers. (0.5 pt) 0 points 1 point Correct calculation of iodine concentration, (0.5 pt) Minor calculation errors Not using calculation errors Correct calculation of and/or incorrect use of Microsoft Equation and/or consistently acetone concentration units and significant or similar equation incorrect use of units (0.5 pt) Q #2 figures. 2 pts editor. and significant figures. Correct calculation of acid concentration (0.5 pt) 1.5 points 0 points 0.5-1 points All calculations are labeled correctly Answers are rounded to the correct number of
(c. 3 pts) Based on the class average data for your lab section determine the rate constants for each of the reactions studied (four room temperature runs, one cool and one ice). When using the orders from part b. round them off to the nearest whole number. Explain the steps in the process and show one sample calculation. Also report an average rate constant for the four room temperature runs, for the cool experiments and for the cold experiments. For the room temperature reactions include the numeric error ( {Type answer here including sample calculations and explanatory text as appropriate.} (Ignore this question) Based on the amount that you had to round off the orders to get to a whole number in going from part 2b to part 2c above, what does this tell you about the error in the experiment? What are some likely sources of error in this experiment? {Insert discussion here.} (4 points) Based on your data, how does the rate constant change with temperature? Why does it change in this way? {Insert discussion here.} (4 points) Using class data from the room temperature and variable temperature experiments calculate the value of the activation energy for this reaction using either the two-point form of the Arrhenius equation or the linear Arrhenius equation/graphical approach. Show a sample calculation using the two point method if relevant and include your graph used to determine activation energy using the graphical approach. {Insert fully labeled graph, sample calculations and answers here} Unsatisfactory Borderline Satisfactory Excellent Score Q #1 Not using Microsoft Equation or similar equation editor but stringing out calculations in lines of text and numbers. 0 points Correctly identified two trials within 10% of each other. (0.5 pt) Calculations are correct showing the two are within 10% of each other (0.5 pt) 1 point 1 pts. Q #2 Not using Microsoft Equation or similar equation editor. 0 points calculation errors and/or consistently incorrect use of units and significant figures. 0.5-1 points Minor calculation errors and/or incorrect use of units and significant figures. 1.5 points Correct calculation of iodine concentration, (0.5 pt) Correct calculation of acetone concentration (0.5 pt) Correct calculation of acid concentration (0.5 pt) All calculations are labeled correctly Answers are rounded to the correct number of 2 pts
c210L2015iodhi1.docx