Question

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Questions 1. Why is it necessary to write the balanced chemical equation for the reaction before completing any stoichiometry problems? The balanced equation makes it possible to Convert information about a reactant or product to quantitative data, per the Conservation of matter. 2. What does your percent yield indicate about the amount of copper actually formed in the reaction? Did you produce all the copper expected? Explain. 3. Based on your percent yield, indicate a source of error during the procedure would have caused such an effect on your result. Explain. 4. The zinc was the limiting react in this reaction. It was mixed with an excess amount of copper (11) sulfate to ensure that all of the zinc would react. What would you expect to happen if copper (II) sulfate was the limiting reactant?

Answer 1

1) According to law of conservation of mass ," mass can neither be created nor be destroyed" so to obey the law it is necessary to write the balance chemical equation before any stochiometry problems. The balanced chemical equation tells us about the mass we have added for reactant is same as the m,ass of products we got after reaction.

2)Percent yield tells us about the actualy amount of any substance formed during the reaction according to the expected amount of substance.This acutal yield always less than the expected amount because of impurities present in the substance or loss of subatnce by any other physical mean during the reaction.