The second picture, the table, is the data known for the unknown subsances. The last pciture is the "table after the lab" that they refer to in the question to identify the unknown substance based upon the density.

6. Use the table provided after the lab to verify the identity of your unknown solids, Calculate the percent error in your measurement. If you did not determine the correct identity provide valid reasons why. Table 4: Density of an Unknown Solid Description of Unknown Mass Initial Volume Final Volume Volume Displacement 13ml 1 purp 15.944 Density 1.23 g/ml 69ml 82ml 2 green 22.523 82ml 99ml 17ml 1.32 g/ml Density g/ml 2.71 0.95 0.75 0.90 1.05 1.15 1.42 1.28 1.17 1.37 1.54 1.32 2.20 8.56 8.91 Material Name Aluminum High density polyethyle (HDPE) Maple Polypropylene Polystyrene Polyamide (nylon) Acetal Polyethylene Tetraphthalate (PETG) Acrylic Polyvinyl Chloride (PVC) Chlorinated PVC (CPVC) Phenolic PTFE (Teflon) Brass Copper