CHM 109     Sp 2010 Exam Key List

Exam 1:      section 002            section 003           section 004    Keys:     A   B   C   D    Grading comments: s.f.: significant figures,

        students         48                         46                           27                         r.e.: rounding error,  m.e.: math error or calc.: calculator error 

           range       4.9-17.4                4.4-15.0                  4.0-17.6                    alg.: algebra error, awk.: awkward prose, ww: wrong word

         average       11.51                    10.87                       10.97

              A's           4                           1                             3            Key improvement areas: unit conversions, learn metrics,  s.f.,  start earlier!!!

             B+'s          5                           3                             0            Understanding (being able to draw) Hydrogen Bonds!!!  Develop understanding

              B's           9                           7                             5            of the subjects on the Study Guide, don't just memorize answers.

Exam 2:      section 002            section 003           section 004    Keys:     J   Other   Note: If you had H, P, R, Y, or Z most of your

                    answers are on the "Other" key.  If you cannot find an answer to one of your problems there, look at the J key.         

        students         37                        37                          19                            I had time to do a formal analysis of algebra and calculator errors for

         range        2.2-15.0               4.2-15.6                  5.3-16.5                    sections 002 & 004.  In section 002, 63% of students had an algebra error

        average       11.21                  10.74                      12.08                       on prob. #10 or #14, and 36% of that section had a calculator error on one  

             A's            1                          1                            4                         of those two problems.  For section 004, the error rates were 36% and 24%,

            B+'s           1                          2                            1                         respectively.  On the bright side: 42% of the students in s 004 got a B or higher.

             B's           10                         4                            3                       

            Values include only students that did not drop the course.