RxnsCopperrs07

RxnsCopperrs07 - explain at least two reasons why this may...

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REPORT SHEET Date March 31, 2008 Name Shannon Polson Reactions of Copper Partner Justin and Brenda Include with this report sheet your data sheet. Answer the following questions: 1. Charles ended with less than 100% copper recovered. Assuming that he used the balances correctly and did the mathematical calculation correctly, explain at least two reasons why this may have happened to him. 1) He could have lost some of the copper by taking the stirring rod out and placing it on the table without rinsing it off first. 2) Some of it could have been lost while draining the solution. 2. Charlene apparently ended with more than 100% copper recovered. Assuming that she used the balances correctly and did the mathematical calculation correctly,
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Unformatted text preview: explain at least two reasons why this may have happened to her. 1) She might have not got all of the zinc out. 2) All of the water might not have evaporated. 3. As zinc was present in excess, you should have observed some unreacted zinc. Compute the moles of zinc that actually reacted to give you the copper you recovered. .049 mol zn .012 mol Cu 4. List the type of reaction (i.e. Decomposition) observed in each of the following steps of the procedure in this experiment. (Your textbook may be helpful here.) Procedure Step Number Type of Chemical Reaction 2 Double replacement 3 Combustion 4 Double replacement 5 Single replacement...
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