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CH 1 Review: Metric, Dimensional Analysis, Sci Not and Sig Fig, Accuracy and Precision 1. Before the use of money, people bartered for goods they needed. If 25 chickens could be traded for 1 pig, 10 pigs could be exchanged for 1 cow, and 7 cows traded for 2 horses, how many chickens could be exchanged for 420 horses. 2. A pool is filled with water by a hose that delivers water at a flow rate of 1.0 gal/sec. What is the equivalent unit of the flow rate in units of L/min? 1 gallon = 4 quarts; 1 L = 1.057 gt 3. When the Pharmacopoeia of London was compiled in 1618, the troy system of measure was used to prepare medicine. Among the units used were: 20 rains = 1 scupple 3 scupples = 1 drachm 20 rachms = 1 ounce 12 ounces = 1 pound Thus 3.75 scruples = _______________pounds. 4. There are 4047 m2 in one acre; determine the area of 254 acre tract of land in square kilometers. 5. Convert the following numbers to Scientific Notation: 5,213,000 = 232.1 = 0.00000314 = 6. Convert the following numbers to "normal notation" (eg, 1000)" 2 x 10-5 = 1.628 x 100 = 7. Perform the following operations: (2.51 x 103 ) + (5.23 x 104 ) = (7.2 x 108 ) x (2.12 x 10-2 ) = 8. A measurement was taken three times. The correct measurement was 68.1 mL. Circle whether the set of measurements is accurate, precise, both, or neither. a) 78.1 mL, 43.9 mL, 2 mL accurate precise both neither b) 68.1 mL, 68.2 mL, 68.0 mL accurate precise both neither c) 98.0 mL, 98.2 mL, 97.9 mL accurate precise both neither d) 72.0 mL, 60.3 mL, 68.1 mL accurate precise both neither 9. A standard mass of 250.0 g was placed on a balance. The balance said it had a mass of 243.9 grams. What is the balance’s percent error? Is this within allowable limits?