CHEM105 Practice Final Exam Fall 2013 Name Please ignore all point values on this Practice exam as they are all incorrect. Constants and equations: Speed of light: c = 2.997x108ms-1Plank’s constant: h=6.626x10-34J∙s 1 J = 1 kg∙m2∙s-2charge of an e-: e = 1.602x10-19C mass of e-: me=9.11x10-31kg mass of p+: mp=1.67x10-27kg Avogadro’s constant: NA= 6.022x1023mol-1DeBroglie Relation: v()()c = ∙R=0.08206 L atm mol-1K-1= 8.314 J mol-1K-1√
CHEM105 Practice Final Exam Fall 2013 Multiple Choice: 1. The degree of agreement among several measurements of the same quantity is called __________. It reflects the reproducibility of a given type of measurement. a) accuracy b) error c) precision d) significance e) certainty 2. A species with 12 protons and 10 electrons is 3. Which of the following atomic symbols is incorrect? 4. Consider the element indium, atomic number 49, atomic mass 114.8 g. The nucleus of an atom of indium-112 contains 5. Phosphorus has the molecular formula P4,and sulfur has the molecular formula S8. How many grams of phosphorus contain the same number of molecules as 7.88 g of sulfur? a) 3.80 g b) 0.263 g c) 7.61 g d) 7.88 g e) none of these 6. You have exposed electrodes of a light bulb in a solution of H2SO4such that the light bulb is on. You add a dilute solution and the bulb grows dim. Which of the following could be in the solution?
CHEM105 Practice Final Exam Fall 2013 7) A reaction occurs between sodium carbonate and hydrochloric acid producing sodium chloride, carbon dioxide, and water. The correct set of coefficients, respectively, for the balanced reaction is: 8. All of the following reactions 2Al(s) + 3Br2(l) 2AlBr3(s) 2Ag2O(s) 4Ag(s) + O2(g) CH4(l) + 2O2(g) CO2(g) + 2H2O(g) can be classified as Four identical 1.0-L flasks contain the gases He, Cl2, CH4, and NH3, each at 0°C and 1 atm pressure.
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