1Gen Chem I Exam 1 Review (Chapters 1 & 2) Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. All of the following are properties of antimony. Which one is not a physical property? a. It is a solid at room temperature. b. It has both yellow and gray forms (allotropes) in the solid state. c. It burns in an atmosphere of chlorine. d. It is one of the few substances that expands upon freezing. e. The gray form melts at 631°C. ____ 2. The following properties describe zinc. Which one(s) is (are) chemical properties? I. It is bluish-white metal. II. It corrodes upon prolonged contact with moist air. III. Its density is 7.14 g/cm3. IV. It melts at 419°C. V. It conducts electricity. a. IV and V d. II, IV, and V b. IV e. II c. V ____ 3. Identify which of the following properties of methane would be observed only with a change in composition. a. The melting point is −182.5°C. d. The boiling point is −161.5°C. b. The density is 6.67 × 10-4 g/cm3. e. It dissolves slightly in water. c. Carbon dioxide forms when it burns. ____ 4. Which of these physical changes would require the liberation of energy? a. condensation of steam to form liquid water b. melting of ice c. boiling of water d. all of the above e. none of the above ____ 5. Which answer lists all the substances below that are compounds and not any elements or mixtures? I. ethyl alcohol II. neon III. sulfur IV. water V. crude oil a. I, II, and III d. II, III, and V b. I, IV, and V e. I and IV c. IV and V2____ 6. A sample of matter that can be decomposed into three different elements a. must be a solution. b. must be a compound. c. must be a heterogeneous mixture. d. must be a homogeneous mixture. e. could be any of the preceding four answers. ____ 7. Below is a list of common prefixes used in the SI and metric systems. Included with each is an abbreviation and meaning. Which set contains an error? a. mega- M 106 d. micro- m 10-6 b. deci- d 10-1 e. kilo- k 103 c. centi- c 10-2 ____ 8. Which of the following is equivalent to 10 cm? a. 1 m d. 1000 µm b. 0.1 dm e. 1 mm c. 100 mm ____ 9. The answer to the following calculation, rounded to the proper number of significant digits, is: 23.413 g ÷ (2.15 cm × 1.1 cm × 3.73 cm) a. 2.654 g/cm3 d. 3.0 g/cm3 b. 2.65 g/cm3 e. 2.66 g/cm3 c. 2.7 g/cm3 ____ 10. If 5.76 × 1013 neon atoms (spherical) were laid in a line, each touching the next, the line would measure 2.54 miles. What is the diameter of a neon atom in Å? a. 0.92 Å d. 1.44 Å b. 0.71 Å e. 1.74 Å c. 1.86 Å ____ 11. What is the area (in mm2) of a rectangular surface that is 0.640 inch wide and 1.14 inches long? a. 471 mm2 d. 242 mm2 b. 328 mm2 e. 680 mm2 c. 84.2 mm2 ____ 12. Assuming a magnesium atom is spherical, calculate its volume in nm3. The diameter of a magnesium atom is 3.20 Å. The volume of a sphere is V = (4/3) π r3. 1 Å = 1 × 10-10 m and 1 nm = 1 × 10-9 m (Both of these relationships are exact.) π = 3.14 a. 5.57 × 103 nm3 d. 1.71 × 10-2 nm3 b. 2.34 × 10-22 nm3 e. 5.57 × 10-3 nm3 c. 5.57 × 10-24 nm33____ 13. The 1970 standard established by the U.S. government for carbon monoxide emission for automobiles limited exhaust to 23.0 grams of CO per vehicle-mile. Assume that in a given metropolitan area there are 82,700 automobiles, driven an average of 13.5 miles per 24-hour period. How many tons/day of CO could legally be discharged into the area's atmosphere? a. 270 tons/day d. 0.0535 tons/day b. 0.155 tons/day e. 39.0 tons/day c. 28.3 tons/day ____ 14. Caffeine, a stimulant in coffee and some cola drinks, is 49.47% carbon, 5.19% H, 28.8% N, 16.48% O. What is the mass of carbon contained in 37.1 g of caffeine? a. 18.4 g d. 1840 g b. 36.8 g e. 24.3 g c. 6.11 g ____ 15. A metal cube having a mass of 112 grams is dropped into a graduated cylinder containing 30.00 mL of water. This causes the water level to rise to 39.50 mL. What is the density of the cube? a. 2.86 g/mL d. 3.74 g/mL b. 11.8 g/mL e. 10.6 g/mL c. 10.8 g/mL ____ 16. A gold ring has a mass of 15.37 g. If this ring is pure gold (density = 16.1g/mL), what would the volume of the ring be? a. 15.37 mL d. 16.1 mL b. 1.04 mL e. 8.05 mL c. 0.955 mL ____ 17. Liquid propane boils at 231K. What is its boiling point in °C? a. 42°C d. 504°C b. 315°C e. −231°C c. −42°C ____ 18. How much heat is released as the temperature of 25.2 grams of iron is decreased from 72.1°C to 9.8°C? The specific heat of iron is 0.444 J/g•°C. a. 113 J d. 0.697 kJ b. 566.1 J e. 957 J c. 1.11 kJ ____ 19. If 10.0 g of copper cools from 35.0°C to 28.8°C and loses 23.6 joules of heat, what is the specific heat of copper? a. 0.076 J/g•°C d. 0.62 J/g•°C b. 3.8 × 102 J/g•°C e. 76 J/g•°C c. 0.38 J/g•°C4____ 20. A 10.0 kg piece of metal at 50.0°C is placed in 1000. g of water at 10.0°C in an insulated container. The metal and water come to the same temperature at 30.6°C. What is the specific heat of metal? The specific heat of water is 4.18 J/g•°C. a. 0.0686 J/g•°C d. 0.124 J/g•°C b. 0.444 J/g•°C e. 0.0216 J/g•°C c. 0.721 J/g•°C ____ 21. Which one of the following types of matter MUST be composed of 2 or more physically separable substances? a. a gas c. a homogeneous sample b. a mixture d. a metal ____ 22. Convert −53°C to kelvins. a. 220 K c. −326 K b. −53 K d. 273 K ____ 23. How many significant figures are there in the measured number 0.0020? a. 1 c. 3 b. 2 d. 4 ____ 24. If a sample of propane, C3H8, contains a total of 6.0 × 103 atoms of carbon, how many molecules of propane are in the sample? a. 6.0 × 103 d. 1.1 × 104 b. 3.0 × 103 e. 2.0 × 103 c. 8.0 × 103 ____ 25. A compound contains only calcium and fluorine. A sample of the compound is determined to contain 2.00 g of calcium and 1.90 g of fluorine. According to the Law of Definite Proportions, how much calcium should another sample of this compound contain if it contains 2.85 g of fluorine? a. 2.71 g d. 4.50 g b. 4.00 g e. 6.00 g c. 3.00 g ____ 26. Which of the following statements …