ANNOUNCEMENTS

Chemistry:  Final exam during week of Jun 18 on Chapters 12 through 25, excluding certain sections and excluding Chapters 21 through 24 entirely.  Excluded sections are 12.3*, 13.4, 15.3, 16.4, 17.4, 18.3, 18.4, 18.5, 19.4, 19.5, 20.3.  *We learned about percent yield but excluded limiting and excess reagents.

AP Chemistry:  Final exam during week of Jun 18 on Chapters 12 through 18, excluding Chapter 15.

All:  We have a special bell schedule for Mon, Jun 18.  |  I have gone back on applied an aggregate curve to the first three exams.  I may also apply a curve to the fourth exam depending on performance.

 

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PERCENT ERROR

  • You MUST use the percent error formula below when performing percent error calculations for your lab reports.  This version of the formula indicates whether your experimental value is less than or greater than the true value.  If it is less than the true value, the percent error will be negative.  If it is greater than the true value, the percent error will be positive.
     
  •                   (experimental value) − (true value)
    % error  =  ―――――――――――――  100
                                           true value
     
  • Remember, experimental value is what you recorded/calculated based on your own experiment in the lab.  The true value is the textbook/literature value.  You're hoping that if everything goes perfectly in lab (which almost never happens), your experimental value will be very close to the true value.