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B-15
b)
Most reactions do not yield 100% recovery of the product. Suggest 3 or more reasons, along
with a brief explanation, that would result in a percent recovery of less than 100%.
Also suggest one reason why one might obtain a yield of greater than 100% (0.5 marks)
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3.
a)
Write the balanced molecular equation for the oxidation-reduction reaction that occurs
between copper(II) sulfate and zinc metal. (0.4 marks)
b)
Calculate the moles and mass of zinc that reacted with the copper(II) ions to form the copper
solid that you recovered. (0.6 marks)
4.
During the final step of this experiment to recover copper metal, colorless gas bubbles continued to be
produced in the reaction solution after the solution turned colorless. Explain why these bubbles
continued to be produced even though the reaction between copper ions and zinc metal was complete
as indicated by the colorless solution. Include the appropriate balanced molecular equation to support
your answer. (0.8 marks)
