Chapter 10 Laboratory: Reduction-Oxidation (Redox) Reactions 185RQEWEvI UESTIOnS
q 1 : Observe and describe the appearance of the products after heating the crucible. (If necessary, use a mortar and pestle to crush
the product.) Which products can you identify visually?
q: 2 From the balanced equation for this reaction and knowing that the molar masses of carbon and copper(II) carbonate are
12.01 g/mol and 123.56 g/mol respectively, which reactant was in excess, and by how much? Why might we have chosen to use this
reactant in excess?
q: 3 Assuming that the carbon reacted stoichiometrically with the copper(II) carbonate and that none of the carbon reacted with
atmospheric oxygen to form carbon dioxide, calculate the expected mass loss. How does the calculated mass loss compare with the
mass loss you observed?
q: 4 More than 2,000 years passed from when copper ore was first smelted in about 3500 BC until iron ore was first smelted
in about 1200 BC, and another 3,000 years passed before aluminum metal was successfully reduced from aluminum ore in the
nineteenth century? Why did it take so long?