Practice: Electrochemistry 1/6 Copyright © 2022 Apex Learning Inc. Use of this material is subject to Apex Learning's Terms of Use. Any unauthorized copying, reuse, or redistribution is prohibited.   Practice: Electrochemistry Practice Name:   Date:   You will need to use a calculator, a periodic table, and a standard reduction potential table to complete this activity. 1. Sodium can be extracted by heating naturally occurring salt until it is molten. An electrochemical process is then used to extract the sodium. Cl2 is produced at the anode, and Na is collected at the cathode. a. Write the half-reactions that occur at the anode and the cathode. Identify each as either oxidation or reduction. (4 points) b. Based on these half-reactions, write the reduction potentials for the electrodes that correspond to points A and B on the graph, assuming standard conditions. (2 AP Chemistry Sem 1 2.2.7 2.2.7 Practice: Electrochemistry 2/6 Copyright © 2022 Apex Learning Inc. Use of this material is subject to Apex Learning's Terms of Use. Any unauthorized copying, reuse, or redistribution is prohibited. points) c. Use the graph to determine Eºcell . (2 points) 2.2.7 Practice: Electrochemistry 3/6 Copyright © 2022 Apex Learning Inc. Use of this material is subject to Apex Learning's Terms of Use. Any unauthorized copying, reuse, or redistribution is prohibited. d. Based on the graph, is the process shown in the figure an example of a galvanic reaction or an electrolytic reaction? Explain. (2 points) 2. Aluminum metal reacts with zinc(II) ion in an aqueous solution by the following half-cell reactions: Al(s) → Al3+(aq) + 3e− Zn2+(aq) + 2e− → Zn(s) a. Predict the potential of the cell under standard conditions. (4 points) 2.2.7 Practice: Electrochemistry 4/6 Copyright © 2022 Apex Learning Inc. Use of this material is subject to Apex Learning's Terms of Use. Any unauthorized copying, reuse, or redistribution is prohibited. b. Predict whether the reaction will occur spontaneously, or whether a source of electricity will be required for the reaction. Justify your answer. (2 points) c. In terms of the metals involved, predict the direction electrons will flow in the reaction. (2 points) 2.2.7 Practice: Electrochemistry 5/6 Copyright © 2022 Apex Learning Inc. Use of this material is subject to Apex Learning's Terms of Use. Any unauthorized copying, reuse, or redistribution is prohibited. d. Predict which electrode will lose mass and which will gain mass. (2 points) 3. An electrochemical reaction occurs between an unknown element and zinc. The half-cell reaction for the zinc is: Zn(s) → Zn2+(aq) + 2e− The cell potential for the reaction is Eºcell = 1.83 V. a. Is the reaction spontaneous or nonspontaneous? Explain. (1 point) b. What is the half-cell potential of the unknown species? (2 points) 2.2.7 Practice: Electrochemistry 6/6 Copyright © 2022 Apex Learning Inc. Use of this material is subject to Apex Learning's Terms of Use. Any unauthorized copying, reuse, or redistribution is prohibited. c. What is the identity of the unknown element? (2 points) Copyright © 2018 Apex Learning Inc. Use of this material is subject to Apex Learning's . Any unauthorized copying, reuse, or redistribution is prohibited. Apex Learning ® and the Apex Learning Logo are registered trademarks of Apex Learning Inc. Terms of Use 2.2.7