I cannot seem to find your experimental design activity? Please let me know if it is there and I'm missing it or if it will be posted. Also it looks like your "atom lab" and "Isotopes and mass spectrometry Activity" are the same? Is that correct?
Thanks

Heather - thank you for pointing out the error. The lab was posted twice by mistake. Also an updated version of the Isotopes and Mass Spectrometry labs has been posted along with an answer key. We currently do not have an experiemental design activity - just the one lab. - Melissa