When zinc is added to a blue solution of copper sulfate, a chemical reaction occurs. Copper settles from the solution as an orange-brown precipitate, zinc dissolves into the solution, and the blue colour of the solution fades. The mass of copper formed is approximately equal to the mass of zinc that dissolves. A student predicted that 1 kg of solid copper sulfate should contain 250 g of pure copper. To test the prediction, a 10.0 g sample of blue copper sulfate crystals was dissolved in water. 5.0 g of zinc metal were added to the solution. The solution was left to stand until the blue colour had completely disappeared. The resulting solid was separated, dried thoroughly and weighed. Its mass was 4.9 g. Which statement is correct? А. The student's prediction is supported because the mass measured was very close to the expected result. В. The student's prediction is not supported. The mass measured is too large because not all the copper sulfate has reacted. C. The student's prediction is not supported. The mass measured is too small because insufficient zinc was added to the solution. D. The student's prediction is not supported. The mass measured was too large because there is unreacted zinc mixed with the copper.

When zinc is added to a blue solution of copper sulfate, a chemical reaction occurs. Copper settles from the solution as an orange-brown precipitate, zinc dissolves into the solution, and the blue colour of the solution fades. The mass of copper formed is approximately equal to the mass of zinc that dissolves. A student predicted that 1 kg of solid copper sulfate should contain 250 g of pure copper. To test the prediction, a 10.0 g sample of blue copper sulfate crystals was dissolved in water. 5.0 g of zinc metal were added to the solution. The solution was left to stand until the blue colour had completely disappeared. The resulting solid was separated, dried thoroughly and weighed. Its mass was 4.9 g. Which statement is correct? А. The student's prediction is supported because the mass measured was very close to the expected result. В. The student's prediction is not supported. The mass measured is too large because not all the copper sulfate has reacted. C. The student's prediction is not supported. The mass measured is too small because insufficient zinc was added to the solution. D. The student's prediction is not supported. The mass measured was too large because there is unreacted zinc mixed with the copper.

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter2: Chemical Compounds

Section: Chapter Questions

Problem 105QRT

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