CHM 2045, Fall 2016, Final Exam Review Packet
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1 Study Tips for the Final: - WRITE OUT EVERYING (This is the easiest way to prevent silly mistakes and the easiest way to find them!) - Make note of you frequent mistakes! (Correct molar mass? Units? SI conversion?) - Independently (& correctly!) answer questions on all previous exams and quizzes/worksheets of new material - Make a one-page review sheet of conceptual information you want to reference quickly - Complete a timed practice with the practice final exams 1. Which of the following is not true? (1) 2 moles of electrons are transferred in the reaction Fe(s) +SnSO4(aq) FeSO4(aq) + Sn(s) (2) The net ionic equation for the reaction between aqueous lead(ii) nitrate and aqueous iron(iii) chloride is 2 Pb + (aq) + 2 Cl (aq) Pb2Cl2(s) (3) Nitrogen is the oxidizing agent in the reaction: 3CuS S H + + 8NO3-3Cu SO NO(g) + 4H2O (4) H2SO4 could be used to selectively remove Ca 2+ from a solution containing Na +, Hg +, and Al 3+ (5) H2SO4 + 2KOH K2SO4 + 2H2O is an acid/base reaction, but isn t precipitation. 2. If ml of 0.55 M H2SO4 is required to completely neutralize a 0.63 g sample of an unknown base (BOH), what is the approximate molar mass of the base? (1) g (2) g (3) g (4) g (5) g
2 3. How many atoms of oxygen are contained in 6.7 grams of sodium perchlorate? (1) x atms (2) x atms (3) x atms (4) x atms (5) x atms moles of Fe2O3(s) react with 66 moles of Al(s) to produce Fe(l) and Al2O3(s), how many moles of excess reactant are left over after the reaction has occurred as completely as possible? (1) 12 mols (2) 15 mols (3) 24 mols (4) 44 mols (5) 33 mols
3 5. A 4.08g sample of Na2CO3 xh2o? is dissolved in an aqueous solution of excess BaCl2. The resulting BaCO3 precipitate is filtered off and found to have a mass of 2.77 g. What is the value of x in Na2CO3 xh2o? (1) 8 (2) 9 (3) 10 (4) 11 (5) Which of the following is not true? (1) Fe2O3 is composed of a paramagnetic ion (2) Se has 6 valence electrons (3) The correct quantum numbers for the first electron removed from chromium, Cr are n=4, l=0, and ml=0 (4) The first ionization energy, IE1, is larger for Li than for Be. (5) BaCl has more ionic character than FeCl2
4 7. Which of the following is not isoelectronic with the others? (1) Ca 2+ (2) Sc 3+ (3) S2 (4) Ar (5) Zn 2+ CHM 2045, Fall 2016, Final Exam Review Packet 8. Consider the following neutralization reaction: 4Fe(s) + 3O2(g) 2Fe2O3(s) H = kj How much heat is released when 100. g Fe and 200. g O2 are reacted? (1) 1652 kj (2) 7401 kj (3) 8121 kj (4) 3441 kj (5) 4681 kj
5 9. Calculate the final temperature of a solution when 6.00 ml of 9.0 M HCl at 25 C is added to 100 ml of water at 25 C. Assume that: HCl released 30 kj/mol when dissolved, the solution has a density of 0.98 g/ml and a specific head capacity of 4.18 J/g C, and that the container has negligible heat capacity. (1) (2) (3) (4) (5) The energy to remove an electron from the ground state of an element is 2134 kj/mol. What wavelength of light contains enough energy in a single photon to ionize one atom of this element? (1) 56 nm (2) 87 nm (3) 166 nm (4) 146 nm (5) 190 nm
6 11. Which of the following is not true? (1) The central atom in BH2 is sp 2 hybridized (2) 10 sigma bonds and 1 pi bond are found in CH2CHCHCH3 (3) Li2O will have a larger lattice energy than Na2S (4) SO3 2- will have a weaker sulfur oxygen bond than SO3 (5) XeF2 has a smaller F-Metal-F bond angle than SnF2 CHM 2045, Fall 2016, Final Exam Review Packet 12. An important part of the Born-Haber cycle for the formation of KF(s) from K(s) and F2(g) is K(g) + ½F2(g) K+(g) + F (g) Which choice corresponds to the energy change for this process? (1) IEK + BEF2 (2) ΔHsubl,K + IEK + ½BEF2 (3) IEK + ½BEF2 + EAF (4) ΔHsubl,K + BEF2 (5) IEK + EAF
7 13. Consider two equally sized balloons at room temperature, one filled with oxygen gas and one filled with an unknown gas. If the balloon filled with oxygen deflates in 29 minutes and the other balloon deflates in 47 min, which of the following is the most likely identity of the unknown gas? (1) Ne (2) Ar (3) Kr (4) Xe (5) Rn 14. A flask is filled with 6.0 atms of gaseous H2 and 2.0 atms of gaseous O2. When a lit match is thrown into the flask, the gases react and form gaseous H2O. What is the pressure in the flask after the reaction? SOLVE (1) 3.5 atms (2) 4.5 atms (3) 5.5 atms (4) 6.5 atms (5) 7.5 atms
8 15. Which of the following is not true? (1) 0.12 m Na2SO4 has a higher boiling point than 0.12 m KBr (2) 0.10 m CaCl2 has a lower freezing point than 0.20 m HOCH2CH2OH (3) According to the phase diagram, the solid has a lower density than the liquid. (4) According to the phase diagram, the temperature corresponding to Point E is the normal boiling point. (5) All of the following are true. 16. Nickel crystallizes in a face-centered cubic structure with an edge length a = 352 pm. Based on this information, calculate the appoximate density of nickel. (1) 7.75 g/cm3 (2) 8.94 g/cm3 (3) 8.03 g/cm3 (4) 9.84 g/cm3 (5) 10.6 g/cm3
9 17. The molality of a 5.86 M ethanol (C2H5OH) solution whose density is g/ml is closest to? (1) 3.45 m (2) 5.07 m (3) 7.05 m (4) 7.49 m (5) 8.92 m 18. Sweating is the body s natural process of cooling your body. By how many degrees will your body cool (assume 100kg person and that a body is mostly water) if you evaporate away 10g of water? Possibly useful information: Cp(liquid) =4.18 J/g C Cp(gas)= 2.00 J/g C ΔHvap= 40.7kJ/mol ΔHfus=6.03kJ/mol (1) C (2) 0.97 C (3) 0.11 C (4) C (5) C
10 19. Consider a liquid with a vapor pressure of 200. torr at 20.0 oc and a vapor pressure of 400. torr at 50.0 C. What is the closest value to the normal boiling point of this liquid? (1) 18.2 oc (2) 22.0 oc (3) 83.8 oc (4) 295. oc (5) 357. oc 20. The reaction: 2HgCl2(aq) + C2O42 (aq) 2Cl (aq) +2CO2(g) + Hg2Cl2(s) was studied by the method of initial rates and the following results were obtained: [HgCl2] (M) [C2O42 ] (M) Initial Rate (M/min) x x x x10 6 Which of the following are not true? (1) The reaction is first-order with respect to HgCl2 (2) The reaction is second-order with respect to C2O4 2 (3) The reaction is third-order overall (4) The rate constant (k) is 7.6x10 3 M 2 min 1 (5) All of the following are true.
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(1) M (2) M (3) M (4) M
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