chhw12 - valdez (vv689) Homework #12 Holcombe (52460) 1...

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Unformatted text preview: valdez (vv689) 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. alkaline 2. nickel-cadmium 3. lithium-iodine correct 4. mercury 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. negative plates, lead/spongy lead. 2. positive plates, lead/PbO 2 . correct 3. casing enclosing the entire battery. 4. H 2 SO 4 electrolyte. 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 with a higher reduction potential to be sacrificed. 2. a metal that is a better reducing agent to be sacrificed. correct 3. a metal with a lower oxidation potential to be sacrificed....
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This note was uploaded on 09/26/2010 for the course CH 53215 taught by Professor Mccord during the Spring '09 term at University of Texas at Austin.

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chhw12 - valdez (vv689) Homework #12 Holcombe (52460) 1...

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