Chemistry 121: Atomic and Molecular Chemistry Midterm 1 October 8, 2010
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1 /50 Total Marks Name: Student Number 1a) You are required to make a solution that has a strontium concentration of 1000 mg/l. You have strontium dichloride hexahydrate powder that you will dissolve into 1% Nitric acid in a 100 ml volumetric flask. Calculate how many grams of strontium dichloride hexahydrate powder you would need to add. What would this concentration be in Molarity? /3 1b) If the error associated with weighing the powder above is g and the error associated with the volumetric flask is 0.1 ml calculate the relative and absolute error for both the 1000 mg/l and the Molarity value. 1c) What volume of the 1000 mg/l solution prepared above would need to be added to a 10 ml Volumetric flask to make a solution of 25 mg/l? Page 1 of 7
2 2) An unknown compound has a formula of XF 3. If the mass spectra of the molecular ion has only 2 peaks, one of which has a mass of 68 amu and a relative intensity of 100% and a second that has a mass of 67 amu and a relative abundance of 24.2%. Determine the unknown element X and the relative abundance of any isotopes that are evident. (F has only one isotope). /5 Page 2 of 7
3 3) An 85.0 mg sample of a compound, which contains only carbon, hydrogen and nitrogen, is burned completely in oxygen. The products of combustion are 89 mg of CO 2 and 36.0 mg of H 2 O. The molecular mass as determined by mass spectrometry is 126 g mol-1. Calculate the molecular formula of the compound. /8 Page 3 of 7
4 4) Show the relative energy of all of the atomic orbitals with a principal number of 3 or less. If there is any difference for hydrogen, helium or higher elements, indicate what that difference is. Does the angular momentum quantum number or the magnetic quantum number effect the relative energy? Would this effect be different in Hydrogen than in Helium? /6 5) Sketch all of the orbitals with a principal quantum number of equal to or less than 3 and an angular momentum quantum number of +1. /4 Page 4 of 7
5 6) What is the name of the following compounds? H 2 SO 4 Al 2 O 3 MnO NaNO 3 7) Write condensed electron configurations of these species and identify their magnetic properties (paramagnetic or diamagnetic) Condensed electron configuration magnetic properties K + Cs Zn Br- 8) Balance the following reactions: A) BaCO 3 (s) BaO (s) + CO 2 (g) /4 B) Al (s) + Br 2 (l) AlBr 3 (s) 9) If the reaction described by 8B above produces 0.5 mol of AlBr 3 (s) and the theoretical yield was determined to be 80%, how many moles of Al (s) reacted? Page 5 of 7
6 Multiple Choice (circle best answer) /10 (1 point each) 7) Which of the following transitions would produce the shortest wavelength? (A) Helium 3s 1s (B) Helium 3p 1s (C) Helium 3d 1s (D) All would be equal 8) Which of the following atomic symbols is incorrect? (A) C (B) 17 Cl (C) 15 P (D) 19 K (E) 14 8 N 9) Which of the following atoms has the least valance electrons? (A) Cs (B) Ca (C) Cl (D) C 10) Which of the following atoms has the greatest metallic character? (A) K (B) Mg (C) Si (D) S 11) Which of the following would form an ionic crystal with Fluorine that has the formula XF 2? (A) K (B) Sr (C) O (D) S 12) Given that A = 6.23 ± 0.05, what would the absolute error be for the product 5A? (A) 0.8 % (B) 0.05 (C) 0.25 (D) ) Which of the following would conduct electricity if dissolved in water? (A) BaCl 2 (B) CO (C) CCl 4 (D) SF 4 (E) SO 2 14) Which of the following is not an Alkali metal? (A) Li (B) Na (C) Ca (D) Rb (E) K 15) In Li + the relative energy of the orbitals with a principal Quantum number of 3 would be? (A) 3d<3p<3s (B) 3d>3p>3s (C) 3d>3p<3s (D) 3d=3p=3s (E) 3d<3p>3s 16) Consider the element indium, atomic number 49, atomic mass g. The nucleus of an atom of indium-112 contains; (A) 49 protons, 63 neutrons, 49 electrons. (B) 49 protons, 49 neutrons. (C) 49 protons, 49 alpha particles. (E) 49 protons, 112 neutrons (D) 49 protons, 63 neutrons. Page 6 of 7
7 Chemistry 121: Atomic and Molecular Chemistry Midterm 1 October 8, 2010 h = 6.63 x J s RH = 2.18 x J c = 3.00 x 108 m/s Page 7 of 7
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