Friday, February 11, 2011

Results of the Reaction Rate Test and the Kinetics Lab Write-Up

The results for the reaction rate test were o.k. The total point value for the test was 37 points. The average for the exam was a 25.38 / 37 - (68.59%) and the median was a 26.5 / 37 - (71.6%). I added a 2.25 point curve to everyone's raw score. The grades have already been added to Infinite Campus. Below is a breakdown of the scores.

# of scores/percentage/letter grade
3 / 98.0% / A+
2 / 89.9% / A-
2 / 87.2% / B+
1 / 81.1% / B-
5 / 79.1% / C+
2 / 76.4% / C
2 / 73.6% / C
2 / 70.9% / C-
2 / 68.2% / D+
1 / 65.5% / D
1 / 62.8% / D-
1 / 52.o% / F
1 / 35.8% / F
1 / 22.3% / F

Kinetic Lab Report
Use the lab report procedure that was given to you at the beginning of the year. The entire lab report must be typed. If you do not have it, I will give a short summary of the report format and special points that I will be looking for in this lab.

  • Purpose: Why did you do the lab. What was being studied.
  • Theory: Please do a good job on this for this lab. Discuss all of the concepts being studied by this lab. Points of discussion should be rate of reaction (what is it), concentration affects on rate, temperature affects on rate. Discuss collision / molecular theory when discussing concentration and temperature affects on rates. Discuss activation energy and what was done to determine it.
  • DO NOT RE-WRITE THE PROCEDURE! I know what you did.
  • Data Table: Re-Create the data table from the hand-out. Make sure to include units and report time in just seconds.
  • Analysis: Show all regression data (including "r" squared) to support which order the reaction is and which order the reaction is not. Once the order has been determined, make sure to report the rate law constants with the correct units for each trial. Show the calculations using the modified Arrhenius equation to determine the activation energy.
  • Sources of Experimental Error: Please do a good job on this. Give at least one SEE of substance that could alter your results. Please state what the SEE(s) are and HOW it / they can affect the results.
  • Conclusion: State if results matched theory. Did the reaction rate alter the way that it should by changing concentration and temperature. All results of the lab should be touched upon. Also, discuss any alterations to the lab that would improve the results.

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