1. Which of the following is describing a physical property of a substance?
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1 CHM 1045 Test #1 September 19, Which of the following is describing a physical property of a substance? a. It does not react with ammonia b. It dissolves in acid to give off hydrogen gas. c. It is very flammable in air. d. Its boiling point is 72 C e. It does not decompose until well above 800 C. 2. A sample of pure copper having a mass of 10.5 grams was placed in a crucible and heated over a Bunsen flame. Statement 1: The copper combines with something in the air when heated. Statement 2: The mass of the sample increased by 151% during the heating. Statement 3: After the sample was heated in air, its mass became 26.3 grams. Statements 1, 2, and 3 are respectively. a. data, result, conclusion b. result, data, conclusion c. conclusion, data, result d. result, conclusion, data e. conclusion, result, data 3. Which of the following is a chemical change? a. vaporizing water b. melting wax c. broiling a steak on a grill d. condensing water vapor into rainfall 4. Select the answer that expresses the result of this calculation with the correct number of significant figures = a b c d Select the answer that expresses the result of this calculation with the correct number of significant figures g 1.35 cm cm 3.20 cm = a g/cm 3 b g/cm 3 c g/cm 3 d. 1.2 g/cm 3
2 6. Select the answer that expresses the result of this calculation with the correct number of significant figures and with correct units. a g/cm 2 b g/cm c g/cm 2 d g/cm cm g cm 2 = 7. Which measurement is expressed to 4 significant figures. a kg b cm c g d. 82,360 m 8. Express 96,342 m using 2 significant figures. a m b m c m d m 9. Select the answer with the correct number of decimal places for the following sum: 4.65 g g g = a g b g c g d. 26 g 10. The result of ( ) is properly written as a b c d e The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms? a kg b kg c kg d kg
3 12. Sulfuric acid is consistently at the top of the list of chemicals produced in the United States and is widely used in the production of fertilizers. In 1994, billion pounds of sulfuric acid were produced. How many kilograms was this? (1 lb = 454 g) a kg b kg c kg d kg 13. The area of a 15-inch pizza is in 2. Express this area in square centimeters. (1 in = 2.54 cm) a cm 2 b cm 2 c cm 2 d cm The speed needed to escape the pull of Earth s gravity is 11.3 km/s. What is this speed in mi/h? (1 mi = km) a. 65,500 mi/h b. 25,300 mi/h c. 18,200 mi/h d. 1,090 mi/h 15. 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? (see above problems for conversion factors) a. 849 lb/in 3 b. 376 lb/in 3 c. d lb/in lb/in 3
4 16. A flask has a mass of g when empty and g when filled with water. When the same flask is filled with concentrated sulfuric acid, H 2 SO 4, its mass is 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 g/cm 3 b g/cm 3 c g/cm 3 d g/cm As chief chemist at Superior Analytical Products (SAP) you must design an experiment to determine the density of an unknown liquid to three (3) significant figures. The density is of the order of 1 g/cm 3. You have approximately 7 ml of the liquid and only graduated cylinders and balances are available for your use. Which of the following combinations of equipment will allow you to meet but not exceed your goal? a. Graduated cylinder with ±0. 1 ml uncertainty; balance with ±0. 1 g uncertainty b. Graduated cylinder with ±0.01 ml uncertainty; balance with ±0. 1 g uncertainty c. Graduated cylinder with ±0.01 ml uncertainty; balance with ±0.01 g uncertainty d. Graduated cylinder with ±0.001 ml uncertainty; balance with ±0.001 g uncertainty 18. Kaolinite, a clay mineral with the formula Al 4 Si 4 O 10 (OH) 8, is used as a filler in slick-paper for magazines and as a raw material for ceramics. Analysis shows that g of kaolinite contains g of oxygen. Calculate the mass percent of oxygen in kaolinite. a mass % b mass % c mass % d mass % 19. Who is credited with discovering the atomic nucleus? a. Dalton b. Gay-Lussac c. Thomson d. Millikan e. Rutherford
5 20. Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine- 81, Select the combination which lists the correct atomic number, neutron number, and mass number, respectively. a. 35, 46, 81 b. 35, 81, 46 c. 81, 46, 35 d. 46, 81, Atoms X, Y, Z, and R have the following nuclear compositions: Which two are isotopes? a. X & Y b. X & Z c. Y & R d. Z & R X Y Z R Silicon, which makes up about 25% of Earth s crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, 28 Si, 29 Si, and 30 Si. Calculate the atomic mass of silicon. Isotope Isotopic Mass (amu) Abundance % 28 Si Si Si a amu b amu c amu d amu 23. Which of the following elements are largely unreactive substances? a. alkali metals b. noble gases c. halogens d. alkaline earth metals 24. Which of the following is a non-metal? a. lithium, Li, Z = 3 b. bromine, Br, Z = 35 c. mercury, Hg, Z = 80 d. bismuth, Bi, Z = 83
6 25. Which of the following is a metal? a. nitrogen, N, Z = 7 b. phosphorus, P, Z = 15 c. arsenic, Z = 33 d. thallium, Tl, Z = Which of the following is a metalloid? a. carbon, C, Z = 6 b. sulfur, S, Z = 16 c. germanium, Ge, Z = 32 d. iridium, Z = Which of the following compounds is ionic? a. PF 3 b. CS 2 c. MgCl 2 d. SO Which of the following ions forms commonly from its element? a. N 3+ b. S 6+ c. O 2- d. Ca Which of the following ions forms commonly from its element? a. P 3+ b. Br 7+ c. O 6+ d. Ca Which of the following compounds is covalent? a. CaCl 2 b. MgO c. PCl 3 d. Cs 2 S 31. Which of the following is the empirical formula for hexane, C 6 H 14? a. C 12 H 28 b. C 6 H 14 c. C 3 H 7 d. CH 2.3
7 32. Sodium oxide combines violently with water. Which of the following gives the formula and the bonding for sodium oxide? a. NaO, ionic compound b. NaO, covalent compound c. Na 2 O, ionic compound d. Na 2 O, covalent compound 33. Barium fluoride is used in embalming and in glass manufacturing. Which of the following gives the formula and bonding for barium fluoride? a. BaF 2, ionic compound b. BaF 2, covalent compound c. BaF, ionic compound d. BaF, covalent compound 34. The colorless substance, MgF 2, is used in the ceramics and glass industry. What is its name? a. magnesium difluoride b. magnesium fluoride c. magnesium(ii) fluoride d. monomagnesium difluoride 35. The compound, BaO, absorbs water and carbon dioxide readily and is used to dry gases and organic solvents. What is its name? a. barium oxide b. barium(ii) oxide c. barium monoxide d. baric oxide 36. The substance, CaSe, is used in materials which are electron emitters. What is its name? a. calcium monoselenide b. calcium(ii) selenide c. calcium selenide d. calcium(i) selenide 37. Which one of the following combinations of names and formulas of ions is incorrect? a. Ba 2+ barium b. S 2- sulfate c. OH - hydroxide - d. NO 3 nitrate 2- e. CO 3 carbonate 38. The compound, (NH 4 ) 2 S, can be used in analysis for trace amounts of metals present in a sample. What is its name? a. ammonium sulfide b. diammonium sulfide c. ammonium sulfite d. ammonia(i) sulfite
8 39. Barium sulfate is used in manufacturing photographic paper. What is its formula? a. BaSO 4 b. Ba(SO 4 ) 2 c. Ba 2 SO 4 d. Ba 2 (SO 4 ) What is the formula for lead (II) oxide? a. PbO b. PbO 2 c. Pb 2 O d. PbO Calcium hydroxide is used in mortar, plaster and cement. What is its formula? a. CaOH b. CaOH 2 c. Ca 2 OH d. Ca(OH) Iron (III) chloride hexahydrate is used as a coagulant for sewage and industrial wastes. What is its formula? a. FeCl 3 6H 2 O b. Fe 3 Cl 6H 2 O c. FeCl 3 (H 2 O) 6 d. Fe 3 Cl(H 2 O) What is the name of PCl 3? a. phosphorus chloride b. phosphoric chloride c. phosphorus trichloride d. trichlorophosphide 44. Diiodine pentaoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. What is its chemical formula? a. I 2 O 5 b. IO 5 c. 2IO 5 d. I 5 O Ammonium sulfate, (NH 4 ) 2 SO 4, is a fertilizer widely used as a source of nitrogen. Calculate its molecular (formula) mass. a amu b. 114.l0 amu c amu d amu
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