Practice Exams and Practice Test

Practice Exams and Practice Test - Practice Exam for Exam...

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Practice Exam for Exam #1 Fall, 2007 UNIVERSITY CHEMISTRY I 1. Which of the following is false ? a) Experiments are carefully controlled procedures conducted to test a hypothesis. b) Laws are brief summaries of experimental data. c) The hypothesis is the final explanation of the observed facts. d) Theories or models attempt to explain a series of observations. e) An observation is witnessed, sometimes measured, while a theory is an interpretation of what is observed and can be used to make predictions leading to more experimentation. 2. Which of the following would you classify as a mixture ? 1. a piece of solid Zn 2. a canister of liquid oxygen 3. a sample of air 4. a beaker of liquid glycerol (C 3 H 8 O 3 ) 5. Sterling silver (an alloy of Ag and Cu) a) 1 b) 2 c) 3 d) 3 and 4 e) 3 and 5 3. Which of the following would you describe as a chemical property? 1. Solid iron melts at a temperature of 1535 o C. 2. Silver tarnishes in the presence of sulfur. 3. Nitroglycerin decomposes when detonated. 4. Solid sulfur is yellow. 5. Ammonium nitrate is very soluble in water. a) 1 b) 2 c) 1 and 4 d) 2 and 3 e) 3 and 5 4. A parking lot is 100.0 yards long. Express that length in scientific notation using the proper basic SI unit : HINT: 1 cm = 0.01094 yds a) 9.141 m b) 9.141x10 1 m c) 9.141 x 10 2 cm d) 3.00 x 10 2 ft e) 914.1 m 5. Calculate the density below in g/ml and give your answer with the correct number of significant figures . (2.023 g – 1.8x10 - 3 g) = ? 1.05x10 4 mL a) 1.92 x 10 - 4 g/ml b) 1.9 x 10 - 4 g/ml c) 1.924 x 10 - 4 g/ml d) 2 x 10 - 4 g/ml e) 1.9248 x 10 - 4 g/ml 6. A small cube of Gold (density = 19.3 g/cm 3 ) measures 25.3 mm on a side. What is its mass in grams? a) 313 g b) 124 g c) 48.8 g d) 1.19 g e) 0.313 g 7. The speed of light is 3.0 x 10 8 m/s. What is the speed in miles per hour ? HINT: 1 m = 39.37 in; 1760 yards = 1 mile; 1 yard = 36 inches a) 3.0x10 8 miles/hr b) 6.7x10 8 miles/hr c) 1.9x10 5 miles/hr d) 1.1x10 7 miles/hr e) 4.5x10 5 miles/hr 8. How many pounds of Methanol does it take to fill the 15.5-gallon fuel tank of an automobile modified to run on methanol? HINT: Density of Methanol = 0.791 g/cm 3 1 kg = 2.205 pounds; 1 gallon = 4 quarts; 1 Liter = 1.057 quarts; a) 164 pounds b) 114 pounds c) 102 pounds d) 46.4 pounds e) 4.64x10 -2 pounds Page 2 9. What is the mass in grams of 0.0020 mol of the herbicide, Roundup (C 3 H 8 NO 5 P)? a) 0.34 g b) 0.45 g c) 3.4 g d) 84.5 g e) 170 g
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10. How many molecules of ethanol (CH 3 CH 2 OH) are present in 42.4 mL of Ethanol if it has a density of 0.789 g/mL? a) 7.024 x 10 23 b) 9.28 x 10 26 c) 5.16 x 10 23 d) 8.30 x 10 23 e) 4.37x10 23 11. Ascorbic acid, or vitamin C (C 6 H 8 O 6 ), is an essential vitamin with a molar mass of 176.1 g/mol. If a typical tablet contains 500.0 mg of vitamin C,
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Practice Exams and Practice Test - Practice Exam for Exam...

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