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Homework answers / question archive / Post-Lab Assignment: Each student will submit her/his own post-lab assignment
Post-Lab Assignment: Each student will submit her/his own post-lab assignment. I encourage students to talk to each other when working on the post-lab. But each student must generate her/his own tables, graphs, and answer written questions in her/his own words. Please complete your lab report in a Microsoft Word document by answering the questions listed below. You do not have to retype the questions in your report. At the top of the lab report write: Your name, Date of experiment, CHEM121, Experiment Title Parts I & II: Electrochemical Cell 1) Type and fill in the qualitative data for Table 1 in a Word document. 2) Watch the following YouTube video to see a visual explanation of how electrons are transferred in an electrochemical cell and to help you answer questions 3-5: https://www.youtube.com/watch?v=7634XYgADIM&list=PL3hPmOZdYhyzTLPg- D7oo3jk3Sp2eP912&index=2 3) What do the zinc atoms become when they lose electrons? Is the zinc being oxidized or reduced in this reaction? 4) What do the copper atoms become when they gain electrons? Is the copper being oxidized or reduced? 5) What happens to the electric current if the salt bridge is removed? Explain why in 1-3 sentences. Part III: Grapefruit Battery 9) Does a current flow through the grapefruit? Why? Explain in 1-3 sentences. 10) How does the voltage of the grapefruit cell compare to the zinc/copper electrochemical cell? Propose a hypothesis to explain why these voltages are similar/different. 11) Optional Question: If you experimented with making your own battery at home, I would love to hear about it! Feel free to share your experiences and/or pictures in your postlab report. When complete, save your Word document with the following format: last name_lab7_chem121 Then, upload your saved document to the Lab #5 submission page in Canvas
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Step-by-step explanation
3) Zn2+ ions are formed when zinc atoms on the metal surface lose their electrons.
Zinc atoms are oxidized at the zinc electrode, forming Zn2+ ions, which are then released into solution.
4) Cu2+ ions gain electrons to form Cu. Thus, it reduced.
5) By completing the circuit, the salt bridge allows current to pass. The salt bridge's purpose is to keep the charge balance in the system. If the salt bridge is removed, no current will flow and the voltage will drop to zero.
9) Yes, grapefruit is a citrus fruit, Citrus fruits (grapefruit) have an acidity that allows their fluids to conduct electricity. Citrus fruits are able to do so because they contain citric acid, which is an electrolyte that permits electricity to flow. The electron exchange between a pair of electrodes inserted in the fruit pulp is what generates the power.
10)The amount of electrical current (voltage) is small, if we compare with zinc/ copper electrochemical cell . Only small device use to power in the case of grapefruit cell. More studies have to be done in this area., where we can generate electricity from citrus fruit ( lemon, grapefruit..) Because copper conducts heat efficiently and zinc is a suitable material for battery plates and a good conductor, the zinc/copper battery cell delivers the greatest voltage reading.
