15. The measurement, 0.030 g, has significant digits. A. 1 B. 2 C. 3 D. 4 16. A

Question

15. The measurement, 0.030 g, has significant digits. A. 1 B. 2 C. 3 D. 4 16. A student reacted a piece of zinc with a blue solution. A dull, reddish, brown solid formed, and after several minutes, the solution was clear. What is the dull, brownish solid forming? A. Zn ions B. Ag metal C. Copper metal D. Silver ions 17. A st minum foil in a potassium hydroxide (KOH) solution and then treated the resulting mixture with sulfuric acid (H2SO4) to produce alum, In the first reaction, which gas is formed? A. SO2 B. H2 C. CO2 D. SO3 18. The instructions for collecting the material produced in the above reaction call for dissolving the solid by heating, and then cooling the mixture. If the student did not cool the mixture long enough ( 10 minutes), what would happen? A. No change B. There would be more product recovered C. There would be less product recovered. D. There would be a different reaction, and you would get a different product

Explanation / Answer

15. 0.030g   two significant figures

    B.2

16. Zn (s) + CuSO4(aq) -------------> ZnSO4(aq) + Cu(s)

                 (blue )                                             brownish soild

c. copper metal

17. 2 Al(s) + 2KOH(aq) + 6H2O(l) --------------->2KAl(OH)4(aq) + 3H2(g)

   B. H2

18. C. There would be less product recovered

     

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