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Unformatted text preview: – Homework #11 – holcombe – 1 This print-out should have 8 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. nickel-cadmium 4. lithium-iodine correct 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. negative plates, lead/spongy lead. 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 What current (in amperes) would be re- quired to produce 19 . 7 g of Au (s) from Au 3+ (aq) in 4 hours?...
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This note was uploaded on 11/17/2010 for the course CH 302 taught by Professor Holcombe during the Fall '07 term at University of Texas.
- Fall '07