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CHM134: General Chemistry I Exam I: Spring 2009 Name_________________________ Please circle all final answers. For full credit you must report all responses to the correct number of significant figures. Include units and substances where appropriate. You may use only the basic arithmetic functions of your calculator. 1. 10 pts. Classify each of the following as an element, a compound, a heterogeneous mixture, or a homogeneous mixture: wet sand gold fool’s gold tea water Gasoline is easy to burn. Is this a physical or chemical property? 2. 2 pts. 3. 2 pts. Water 4. 10 pts. density is 1. g/mL. Is this a physical or chemical property? How many significant figures are in the following numbers? 3.40 x 104 nm ___ 76 trombones ___ 5. 8 pts. 123.0 g ___ 120 cm ___ 0.00104 m ___ Perform the following calculations to the correct number of significant figures: 18.5 + 12.456 + 124.78 = ______ 45.6 x 3.2 = ______ (37.5 – 33.2) / 2.68 = ______ (37.3 x 0.15) + 96.4 = ______ 6. 2 pts. A race is 2.5 kilometers long. How many centimeters long is this? ____________ 7. 2 pts. My height is 5.7 feet. How many centimeters is this? _____________ 8. 4 pts. A room is 6.00 meters long, 3.00 meters high, and 5.00 meters wide, how many liters of volume does this represent? You must show your work: 9. 4 pts. What is the volume in mL of an object that has a density of 23.7 g/mL and a mass of 0.487 grams? 10. 4 pts. If a car travels 85 kilometers per hour, how long will it take in seconds to get from Toronto to Montreal (a distance of 504 km)? Show work: 11. 2 pts. Write the isotopic symbol for a sodium isotope that has 12 neutrons: _________ 12. 6 pts. A neutral boron-11 atom has ___ protons, ___ neutrons, and ___ electrons. 13. 6 pts. Give an example of an alkali metal _____, a halogen _____, and a metalloid _____ 14. 4 pts. Calculate the atomic mass of K using the following data. (Show work in table) Isotope Isotope Mass [amu] Natural Abundance K-39 38.963707 93.2581 % K-40 39.963999 0.0117 % K-41 40.961826 6.7302 % Atomic mass = 15. 4 pts. How many actual helium atoms are in a balloon containing 0.34 g of He? 16. 4 pts. How many moles of oxygen atoms are present in 15.7 grams of carbon dioxide? 17. 4 pts. How many grams of NaOH must I use if I want 0.2000 mol of NaOH in a flask? 18. 4 pts. Calculate the mass percent of Ni present in the compound NiSO4 19. 6 pts. What is the empirical formula of a compound that is 34.620 % C, 4.067 % H, and 61.313 % Cl by mass? 20. 6 pts. Provide a name for each of the following: KCl NaClO3 Li2SO4 Cu2O Co(OH)2 Fe2S3 SnO2 HNO3 (aq) N2O5 SF6 BF3 HClO2 21. 6 pts. Provide a formula for each of these names: calcium iodide lithium nitrite sodium phosphate diboron tetrachloride hydrocyanic acid nickel (II) hydroxide lead (II) chromate zinc (II) sulfate hypochlorous acid carbon dioxide magnesium oxide ammonium iodide