Chemistry 223 A.C.S Exam Review

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1 Page III-19a-1 / Final Exam Review Chemistry 223 A.C.S Exam Review What is the A.C.S. Final? American Chemical Society (A.C.S.): the largest professional organization in the world A.C.S. creates exams for organic chemistry, CH 106, many others This is a scaled exam based on national testing by A.C.S. Your score will be scaled or raw, whichever is higher students usually do very well on the A.C.S. exam! :) See A.C.S. Study Guide in Companion / website Chemistry 223 Professor Michael Russell The A.C.S. Final All Chapters Covered Bring: calculator, pencil, scantron (50 questions / side, 100 questions total), Final Exam Worksheet 75 multiple choice questions (four answers per question), ~2 hours in length; meet in AC 1303 at 8:45 AM, Wednesday (H1: see me) Final Grades posted online by Thursday at 8 PM Which statement describes the composition of a neutral atom of iron-58? A. 26 neutrons, 32 protons, and 26 electrons B. 32 neutrons, 26 protons, and 26 electrons C. 26 neutrons, 26 protons, and 32 electrons D. 26 neutrons, 26 protons, and 26 electrons E. ot enough information See A.C.S. Study Guide Good luck with your studying! Let's start the review! itrogen and oxygen form a series of oxides with the general formula xoy. One of them has 46.67%. The empirical formula for this oxide is Ammonia is prepared by the reaction: 2(g) + 3 H2 (g) 2 H3(g) If 10.0 mol of 2 are mixed with 25.0 mol of H2, the amount of H3 produced will be: A mol H3 A. 2O B. O C.O2 D.2O3 E. 2O5 B mol H3 C mol H3 D mol H3 E mol H3 Page III-19a-1 / Final Exam Review

2 Page III-19a-2 / Final Exam Review Which of the compounds below would be the best conductor of electricity in aqueous solution? A. CH 3 CO 2 H B. H 3 PO 4 C.H 3 D.HBr E. HIO Which equation below best represents the balanced net ionic equation for the reaction of potassium hydroxide and iron(ii) chloride to give iron(ii) hydroxide and potassium chloride? A. 2 KOH(aq) + FeCl 2 (aq) Fe(OH) 2 (s) + 2 KCl(aq) B. 2 KOH(aq) + FeCl 2 (aq) Fe(OH) 2 (aq) + 2 KCl(aq) C. 2 OH (aq) + Fe 2+ (aq) Fe(OH) 2 (s) D. K + (aq) + Cl (aq) KCl(aq) Assume you dissolve 6.73 g a 2 CO 3 in enough water to make 250. ml of solution. (Molar mass of a 2 CO 3 = 106 g/mol.) What is the concentration of the sodium carbonate? A M B M C M D M E. 42 M What is the oxidation number for Mn in KMnO4? A. 0 B. +2 C.+4 D.+7 E. +8 Answer = D, +7 Calculate the enthalpy for the reaction SiH 4 (g) + 2 O 2 (g) SiO 2 (g) + 2 H 2 O(g) using these values: H f[sih 4 (g)] = kj/mol; H f[sio 2 (g)] = kj/mol; and H f[h 2 O(g)] = kj/mol A kj/rxn B kj/rxn C kj/rxn D kj/rxn E. ot enough information The correct general valence electronic configuration for the alkali metals is: A. ns 1 B. ns 2 C.ns 2 np 1 D.ns 2 np 5 E. ns 2 np 6 Page III-19a-2 / Final Exam Review

3 Page III-19a-3 / Final Exam Review Compare the elements a, B, Al, and C with regard to the following properties: Which has the largest atomic radius? A. a B. B C.Al D.C E. Jq Compare the elements K, B, Al, and with regard to the following properties: Which has the largest electronegativity? A. K B. B C.Al D. E. Jq Which of the following is OT a correct Lewis dot structure? Determine the formal charges for the formate ion: 1. A. 3. C. H C 2. B. O 4. D. C O A B C D Cysteine is one of the natural amino acids. Which of the following could be an alkene? A. CnH 2n+2 O B. CnH 2n+2 Estimate the values of the indicated angles: A. Angle 1 = 180 Angle 2 = 120 Angle 3 = 109 B. Angle 1 = 109 Angle 2 = 120 Angle 3 = 109 C. Angle 1 = 109 Angle 2 = 109 Angle 3 = 109 C.CnH 2n D.CnH 2n-2 E. none of these Page III-19a-3 / Final Exam Review

4 Page III-19a-4 / Final Exam Review A sample of gas has a volume of 222 ml at 695 mm Hg and 0 C. What would be the volume of this same sample of gas if it were measured at 333 mm Hg and 0 C? A. 894 ml B. 463 ml C.657 ml D.359 ml E ml Gas density: Which has the greatest density at 25 C and 1.00 atm pressure? A. O 2 32 g/mol B g/mol C.H 2 2 g/mol D.CO 2 44 g/mol E. Xe 131 g/mol Under what conditions will the ideal gas law be least effective? A. high temperature and high pressure B. high temperature and low pressure C.low temperature and high pressure D.low temperature and low pressure E. it works all the time In the diagram for acl, the smaller blue atoms are a and the larger green atoms are Cl. How many nearest neighbors of Cl does each a have? A. 8 B. 6 C.4 D.2 E. 1 Which water-based solution is expected to have the higher boiling point? A. molal acl B.0.15 molal sugar C.both the same D.not enough information Erythritol occurs naturally in algae and fungi. A solution of 2.50 g of erythritol in 50.0 g of water freezes at C. What is the molar mass of the compound? (k fp (H2O) = C/m) A g/mol B g/mol C. 122 g/mol D. 224 g/mol E g/mol Page III-19a-4 / Final Exam Review

5 Page III-19a-5 / Final Exam Review Given the initial rate data for the reaction A + B C, determine the rate expression for the reaction. [A] (M) [B] (M) [C]/ t (1/M s) A. [C]/ t = 2000[A][B] B. [C]/ t = 40.[A]2 C. [C]/ t = 4.0[B] D. [C]/ t = 400[A] E. [C]/ t = #1[AC/DC] A. 654 minutes B minutes C.1962 minutes D.2616 minutes E. 0 minutes Radioactive iodine-131 is used to treat hyperthyroidism. It has a half-life of 8.04 days. If you begin with 8.8 micrograms, what mass remains after 32.3 days? A. 4.4 micrograms B. 2.2 micrograms C. 1.1 micrograms D micrograms E micrograms The reaction of O2(g) and CO(g) is thought to occur in two steps. Step 1 Slow Step 2 Fast O2(g) + O2(g) O(g) + O3(g) O3(g) + CO(g) O2(g) + CO2(g) Which species is acting as a catalyst in this mechanism? A. O2 B. O C. CO D. CO2 E. O3 What is the unknown particle in the following nuclear reaction? U à particle + A. alpha B. beta C.gamma D.neutron E. positron Using the graph, determine the half life of this reaction. p End of Review good luck with your studying! eed more practice? Practice Problem Sets (online) Concept Guides (Companion and online) Chapter Guides (online) End of Chapter Problems in Textbook (every other question has answer at end) Good luck with your studying! Page III-19a-5 / Final Exam Review