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Unformatted text preview: General Chemistry Practice Problems Harvard University 1 Math Review: Calculations and Scientific Notation 1. Use your calculator to determine the answers to each of the following calculations. Please round your answers to three or four digits. a) 423.1 + 100 + 0.256 b) 14.000 ÷ 6.1 c) (6.11)( ! ) d) (4/3) ! (2.16) 3 e) (14.3)(60) f) (6.0+9.7+0.61)(1.113) g) 6.958 ! 10 8 5.91 ! 10 12 h) (1.173 " 10 –3 ) + 3.6 i) (1.1 " 10 6 )(2.246 " 10 –10 ) General Chemistry Practice Problems Harvard University 2 Dimensional Analysis I Useful Information : 1 atm = 760 torr 1 kg = 2.2 pounds 1 torr = 0.01933 lb/in 2 1 mL = 1 cm 3 1 N = 0.225 lb 1 inch = 2.54 cm 1 Pa = 1 N/m 2 1 foot = 12 inches Use Dimensional Analysis to calculate the answers to each of the following problems. 1. a) The pressure inside a laboratory vessel is 35 lb/in 2 . Calculate the equivalent pressure in atmospheres. b) A certain chemistry experiment takes place in a highpressure chamber with a pressure of 2.7 atmospheres. Calculate the pressure in torr. c) The atmospheric pressure is measured to be 754 torr. Calculate the pressure in Pa. 2. The recommended adult dose of a drug used to treat asthma is 6.0 mg/kg of body mass. Calculate the dose (in mg) for a 125pound person. 3. A standard sheet of laser printer paper is 0.09 mm thick. How many sheets of paper must be stacked to reach the height of the Eiffel Tower at 1063.0 ft? General Chemistry Practice Problems Harvard University 3 Dimensional Analysis II Useful Information : 1 gallon = 0.134 ft 3 1 mile = 5280 feet 1 mL = 1 cm 3 1 inch = 2.54 cm Use Dimensional Analysis to calculate the answers to each of the following problems. 1. A certain crystal of calcium chloride has a volume of 765.3 mm 3 . a) Calculate the volume of this crystal in cubic inches (in 3 ). b) The density of CaCl 2 is 2.51 g/cm 3 . Calculate the mass of this crystal. 2. A reservoir has an area of 1.3 square miles with an average depth of 93.2 feet. Calculate the volume of water (in gallons) held in the reservoir. General Chemistry Practice Problems Harvard University 3 Dimensional Analysis II Useful Information : 1 gallon = 0.134 ft 3 1 mile = 5280 feet 1 mL = 1 cm 3 1 inch = 2.54 cm Use Dimensional Analysis to calculate the answers to each of the following problems. 1. A certain crystal of calcium chloride has a volume of 765.3 mm 3 . a) Calculate the volume of this crystal in cubic inches (in 3 ). b) The density of CaCl 2 is 2.51 g/cm 3 . Calculate the mass of this crystal. 2. A reservoir has an area of 1.3 square miles with an average depth of 93.2 feet. Calculate the volume of water (in gallons) held in the reservoir. General Chemistry Practice Problems Harvard University 4 Atoms, Molecules, and Ions 1. For each of the following atoms or ions, provide the number of protons, neutrons, and electrons: a) 40 Ar b) 40 Ca 2+ c) 39 K + d) 39 K 2. Calcium chloride is an ionic substance. Determine the number of protons and electrons in a calcium ion (as found in calcium chloride). in a calcium ion (as found in calcium chloride)....
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This note was uploaded on 02/08/2012 for the course CHEM 161 taught by Professor Shaklovich during the Spring '10 term at Harvard.
 Spring '10
 Shaklovich

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