sample_exam_Exam_One - Chemistry 142: Sample Exam 1 Autumn...

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Page 1 Chemistry 142: Sample Exam 1 Name ___________________________________ Autumn 2001 (100 points) 1 Select the best statement. a. Chemical changes provide the only valid basis for identification of a substance. b. Chemical changes are easily reversed by altering the temperature of the system. c. Chemical changes always produce substances different from the starting materials. d. Chemical changes are associated primarily with extensive properties. 2 The average distance from Earth to the Sun is 150 megameters. What is that distance in meters? a. 1.5 × 10 8 m b. 1.5 × 10 6 m c. 1.5 × 10 5 m d. 1.5 × 10 3 m 3 You prepare 1000 mL of tea and transfer it to a 1.00 quart pitcher for storage. Which of the following statements is true? a. The pitcher will be filled to 100% of its capacity with no tea spilled. b. The pitcher will be filled to about 95% of its capacity. c. The pitcher will be filled to about 50% of its capacity. d. The pitcher will be completely filled and tea will spill over onto the counter. 4 A large pizza has a diameter of 15 inches. Express this diameter in centimeters. (1.00 in = 2.54 cm) a. 38 cm b. 24 cm c. 9.3 cm d. 5.9 cm 5 Acetone, which is used as a solvent and as a reactant in the manufacture of Plexiglas ¤ , boils at 56.1 ° C. What is the boiling point in degrees Fahrenheit? a. 159 ° F b. 133 ° F c. 69.0 ° F d. 43.4 ° F 6 The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm 3 . What is that density in pounds per cubic inch? a. 849 lb/in 3 b. 376 lb/in 3 c. 0.491 lb/in 3 d. 1.83 × 10 - 3 lb/in 3 7 A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H 2 SO 4 , its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm 3 at the temperature of the measurement.) a.
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sample_exam_Exam_One - Chemistry 142: Sample Exam 1 Autumn...

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