Chem 103 Module 1 Exam Questions and Answers

Chem 103 Module 1 Exam Questions and Answers 1. Click this link to access the Periodic Table. This may be helpful throughout the exam. Convert 0. to exponential form and explain your answer. Convert 8.32 x 102 to ordinary form and explain your answer. Answer: 1. Convert 0. = smaller than 1 = negative exponent, move decimal 4 places = 9.24 x 10-4 2. Convert 8.32 x 102 = positive exponent = larger than 1, move decimal 2 places = 832 2. Click this link to access the Periodic Table. This may be helpful throughout the exam. Using the following information, do the conversions shown below, showing all work: 1 ft = 12 inches 1 pound = 16 oz 1 gallon = 4 quarts 1 mile = 5280 feet 1 ton = 2000 pounds 1 quart = 2 pints kilo (= 1000) 1/100) milli (= 1/1000) deci (= 1/10) centi (= 1. 350 pounds = ? ton 2. 0.632 m = ? cm Answer: 350 pounds x 1 ton / 2000 pounds = 0.175 ton 0.632 m x 100 cm / 1 m = 63.2 cm 3. Do the conversions shown below, showing all work: 1. 246oK = ? oC 2. 45oC = ? oF 3. 18oF = ? oK Answer: 1. 246oK - 273 = -27 oC oK → oC (make smaller) -273 2. 45oC x 1.8 + 32 = 113 oF oC → oF (make larger) x 1.8 + 32 3. 18oF - 32 ÷ 1.8 = -7.8 + 273 = 265.2 oK oF → oC → oK 4. Be sure to show the correct number of significant figures in each calculation. 1. Show the calculation of the mass of a 10.5 ml sample of mercury with density of 13.5 g/ml 2. Show the calculation of the volume of 21.3 grams of dioxane with density of 1.03 g/ml Answer; 1. M = D x V = 13.5 x 10.5 = 142 g 2. V = M / D = 21.3 / 1.03 = 20.7 ml 5. 1. 0.0756 contains ? significant figures. 2. 1.235 contains ? significant figures. 3. 0.0756 + 1.235 = ? (give answer to correct number of significant figures) Answer; 1. 0.0756 contains 3 significant figures