Working Through The Copper Cycle Experiment

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Title: Working through the Copper Cycle Experiment to Gain Understanding
Author Information
Lab Partner: Leah Richmond* and Shelby Alred
Course: CHEM 111-571
Introduction:
During lab, we put the metal copper under different circumstances so that we could gain a better understanding as to what goes on in the copper cycle. Throughout each stage of the copper cycle, we deduced what type of chemical reaction took place based on observation, made observations about the state of the metal and what type of environment it was subjected to, and determined what the net ionic equation was for each stage. Following the experiment, we calculated what the percent yield was and compared the changes in mass from the initial stage to the final stage.
Materials and Methods:
First, we assembled a fume hood by using a ring stand, a hot plate, a 50 ml beaker, an iron ring to secure the beaker, and a plastic funnel hooked up to rubber tubing and an aspirator. A hose from the sink was then connected to the aspirator and the pressure that the water created allowed the fume hood to remove whatever excess gas was given off during the experiment. In cycle step one, we placed approximately 250 mg of copper into the 50 ml beaker then added 6 ml of HNO_3. We then heated the plate to 10° C until the reaction took place to save time. We would recommend heating the plate initially at 20 C in order to speed up the experiment. The solution was at 11 ml total at the end of step1. In cycle step 2, we
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