Lab Investigation - DOC by yge1qY6


									                                     Lab Investigation
                         Isotopes of Halloweenium
A ghoulish affair was unfolding at the Halloween Confectionery laboratory of Jack-O-
Lantern Candy Company. The onslaught of the season for the sale of candy corn, candy
pumpkins, caramel, and licorice was at a feverish pitch! Yet, in all of this haunting business,
the confectionery technicians have discovered what is believed to be a “pumpkin delight”...
a brand new element. In honor of their tedious work and love of such hallow delights, the
name HALLOWEENIUM has been assigned.

Further research into this succulent and tasty element is to be conducted in Mr. Wallace’s
chemistry classes. Students are all “affeared” of atomic emission, nuclear magnetic
resonance, and mass spectrophotometers! However, this blood curling activity involves
those dreaded procedures of counting, massing, and computing. As they search and collect
data on this new element, their just reward will be savoring their new sweet treats.

As bats and goblins fly over-head, and scary spooks and skeletons dance around, the
investigating scientists will determine how many isotopes exist in this sample of goo!!!
Remember: Isotopes are atoms of the same element that behave chemically the same but
have different physical properties. This is due to the fact that there exists the same
number of protons in each isotope, but a different number of neutrons. The atomic mass
of each isotope varies as will the total mass of each sample of this new goo. The initial
investigation begins with determining the actual number of isotopes in the macroscopic
sample of this element. Then with bones-a-clanging and poltergeists-a-flying, the atomic
mass of each individual isotope will be determined. Applying the aberrations of
computations, each investigator will then determine the weighted average that will be
recorded for each as the atomic mass of the new element. If the confectionery
investigator wishes to have the IUPAC guidelines and assume immediate credit and
recognition for their won discovery, they may name the new element after themselves!

A unique property of this new element is their large-sized atoms that will eliminate any
haunting problems ... sorting, counting, massing, and computing. Working in the macroscopic
world will also help in illustrating the new element in crystalline form. No fear of
ectoplasmic intervention as you proceed with your task.

Details and directions follow. These will help steer you clear of the witches, goblins, and
creepy things that go bump in the night. A tombstone of RIP (Really Important Product) is
provided to help keep facts organized and readily accessible.
Procedure: (Remember to show an example of each different calculation)
   1. Sort the Halloweenium atoms into groups representing each different isotope.
      Record the total number of atoms in your sample, the total mass of the sample and
      the total number of each individual isotope.
   2. Sketch a picture of each isotope clearly showing the differences between each
      atom, and indicate an approximate scale size for each.
   3. Find the total mass of each isotope. Record.
   4. Divide the total mass of the isotope by the actual number of atoms of that isotope
      in the sample. This will give you the average mass of a single atom of that type of
   5. Determine the relative abundance of each isotope by dividing the number of all
      atoms of a particular isotope by the total number of all the atoms in the
      Halloweenium sample.
   6. Multiply the relative abundance found in step 6 by 100 to make it the percent
   7. Multiply the relative abundance by the average mass of each isotope to get the
      relative mass of each isotope.

   8. Sum the relative masses to get the average atomic mass of Halloweenium.

Total Number of Atoms      ___________
Total Mass of Sample       ___________

                     Total Mass                             Percent         Relative
            # of                    Avg. Mass     Relative
Isotope              of Isotope                            Abundance         Mass
            atoms                      (g)       Abundance
                         (g)                                  (%)             (g)



Average atomic mass of Halloweenium      __________

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