Here is your challenge...You will be given a vial with an unknown substance (either Zn, Fe or Cd) and you have to tell us what it is. To do this we have to learn about the chemical properties of each metal.
Each group take three vials.
Fill ONE vial 1/2 full with ZnCl2.
Fill ONE vial 1/2 full with FeCl3.
Fill One vial 1/2 full with CdCl2.
(be sure to label your vials so that you know which is which)
Now add 5 drops of Na2S to each of the 1/2 Full vials and record what happens.
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