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Unformatted text preview: Unit 14: Redox and Electrochemistry 50 point quiz (MC = 2 points each, SA = 10 points) 1. In a redox reaction, the total number of electrons lost is a. Less than the total number of electrons gained b. Greater than the total number of electrons gained c. Equal to the total number of electrons gained d. Equal to the total number of protons gained 2. The diagram below shows a key being plated with copper in an electrochemical cell. The reduction, Cu 2+ (aq) + 2e- Cu(s), occurs at a. A, which is the anode b. A, which is the cathode c. B, which is the anode d. B, which is the cathode 3. Which metal is more active than Ni and less active than Zn? a. Cu b. Cr c. Mg d. Pb 4. Reduction occurs at the cathode in a. Electrolytic cells, only b. Voltaic cells, only c. Both electrolytic cells and voltaic cells d. Neither electrolytic cells nor voltaic cells 5. Given the balanced equation representing a reaction: H + (aq) + OH- (aq) H 2 O(l) + 55.8 kJ, in this reaction there is a conservation of a. Mass, only b. Mass and charge, only c. Mass and energy, only d. Mass, charge, and energy 6. Which balanced equation represents a redox reaction? a. CuCO 3 (s) CuO(s) + CO 2 (g) b. 2KClO 3 (s) 2KCl(s) + 3O 2 (g) c. AgNO 3 (aq) + KCl(aq) AgCl(s) + KNO 3 (aq) d. H 2 SO 4 (aq) + 2KOH(aq) K 2 SO 4 + 2H 2 O(l) 7. Given the unbalanced ionic equation: 3Mg + ____Fe 3+ 3Mg 2+ + ____Fe, when the equation is balanced, both Fe 3+ and Fe have a coefficient of a. 1, because a total of 6 electrons is transferred b. 2 because a total of 6 electrons is transferred c. 1, because a total of 3 electrons is transferred d. 2, because a total of 3 electrons is transferred 8. A student collects the materials and equipment below to construct a voltaic...
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