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Unformatted text preview: savage (jws775) Homework #12 Holcombe (52460) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Which type of battery is best for use in heart (cardiac) pacemakers? 1. mercury 2. alkaline 3. lithium-iodine correct 4. nickel-cadmium Explanation: Pacemaker batteries are placed inside the body cavity, so the battery must be small, last a long time and be made of non-toxic materials. Lithium-iodine batteries last up to 10 years. 002 10.0 points In a lead-acid (storage) battery, the cathode is the 1. casing enclosing the entire battery. 2. positive plates, lead/PbO 2 . correct 3. H 2 SO 4 electrolyte. 4. negative plates, lead/spongy lead. Explanation: Reduction occurs at the cathode; the Pb in PbO 2 is reduced to Pb in PbSO 4 . 003 10.0 points The principle of inhibiting the corrosion of iron by using a sacrificial anode is to allow 1. a metal that is a better reducing agent to be sacrificed. correct 2. a metal that is more active than iron to function as a cathode....
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- Spring '10