CHEM 103 Final Exam

CHEM 103 Final Exam 23/24 Which of the following is an example of a physical property? a. Ability to change color b. Flammability c. Density d. Solubility Exam 1 - c. Density Which of the following is evidence of a chemical change? a. Releasing bubbles of gas b. Floating in water c. Crystallization d. Vaporization e. None of the above Exam 1 - a. Releasing bubbles of gas According to the metric system, 1 m = 0.001 what? a. cm b. mm c. dm d. km e. None of the above Exam 1 - d. km Subtract 9.0 x 10³ sec from 2.0 x 10⁴ sec and express the answer in scientific notation. a. 1.1 x 10¹ sec b. 1.1 x 10² sec c. 1.1 x 10³ sec d. 1.1 x 10⁴ sec e. 1.1 x 10⁵ sec Exam 1 - d. 1.1 x 10⁴ sec Which of the following amounts is the largest? a. 1.0 uL b. 1.0 L c. 1.0 mL d. 1.0 ML e. 1.0 kL Exam 1 - d. 1.0 ML Add 250.0 mL to 5.00 mL and round off the answer. a. 250 mL b. 255 mL c. 256 mL d. 255.0 mL e. 255.0 mL Exam 1 - d. 255.0 mL If 10.4 mL of mercury has a mass of 0.197 kg, what is the mass in pounds? a. 89400 lb b. 0.434 lb c. 4.51 lb d. 89.4 lb e. 4720 lb Exam 1 - b. 0.434 lb What is the volume occupied by a 10.0 g sample of gasoline that has a density of 0.720 g/mL? a. 0.720 mL b. 0.0720 mL c. 1.39 mL d. 7.20 mL e. 13.9 mL Exam 1 - e. 13.9 mL For the calculation (1.200 x 1.23466 x 1.0986) - 1.33, which is the correct answer? a. 0.298 b. 0.3 c. 0.30 d. 0.2977 e. 0.29 Exam 1 - c. 0.30 The number 0.02150 has how many significant figures? a. 3 b. 4