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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
- Redox, mol Ag, Cathode, Anode