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CHAPTER 1 MAKE UP PROBLEMS
Course: CHEM 105A, Summer 2008School: USC
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1 CHAPTER MAKE UP PROBLEMS 1. Classify each of the following as a pure substance or a mixture. If it is a pure substance, classify it as an element or a compound. If it is a mixture, classify it as homogeneous or heterogeneous. a. sweat b. carbon dioxide c. aluminum d. vegetable soup 2. Classify each of the following changes as physical or chemical. a. Sugar burns when heated in a skillet. b. Sugar dissolves in...
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1 CHAPTER MAKE UP PROBLEMS
1. Classify each of the following as a pure substance or a mixture. If it is a pure substance, classify it as an element or a compound. If it is a mixture, classify it as homogeneous or heterogeneous. a. sweat b. carbon dioxide c. aluminum d. vegetable soup
2. Classify each of the following changes as physical or chemical. a. Sugar burns when heated in a skillet. b. Sugar dissolves in water. c. A platinum ring becomes dull because of continued abrasion. d. A silver surface becomes tarnished after exposure to air for a long period of time.
3. Perform each of the following temperature conversions. a. 32 oF to oC. b. 77 K to oF c. -109 oF to oC d. 98.6 oF to K
4. Ethylene glycol (antifreeze) has a density of 1.11 g/cm3. a. What is the mass in grams of 417 mL of this liquid? b. What is the volume on L of 4.1 kg of this liquid?
5. Indicate the number of significant figures in each of the following numbers. If the number is an exact figure, indicate and unlimited number of significant figures. a. 284,796, (2001 887 U.S. population) c. 11.4 g/cm3 (density of lead) b. 2.54 cm = 1 in. c. 12 = 1 dozen
6. Perform the following calculations to the correct number of significant figures. a. (24.6681 x 2.38) + 332.58 c. (512 / 986.7) + 5.44 b. (85.3 21.489) / 0.0059 d. [(28.7 x 105) / 48.533] + 144.99
7. The average U.S. farm occupies 435 acres. How many square miles is this? (1 acre = 43,560 ft 2, 1 mile = 5280 ft)
8. A steel cylinder has a length of 2.16 in, a radius of 0.22 in, and a mass of 41 g. What is the density of the steel in g/cm3?
9. The Honda Insight, a hybrid electric vehicle, has an EPA gas mileage rating of 57 mi/gal in the city. How many kilometers can the Insight travel on the amount of gasoline that would fit in a soda can? The volume of a soda can is 355 mL.
10. The single proton that forms the nucleus of the hydrogen atom has a radius of approximately 1.0 x 10 13 cm. The hydrogen atom itself has a radius of approximately 52.9 pm. What fraction of the space within the atom is occupied by the nucleus?
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