2023-usnco-national-exam-part-i

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property of acs usnco – not for use as usnco national exam after april 23, 2023 distributed by the american chemical society, 1155 16th street, n.w., washington, dc 20036 all rights reserved. printed in u.s.a. 2023 u.s. national chemistry olympiad national exam part i prepared by the american chemical society chemistry olympiad examinations task force olympiad examinations task force seth n. brown, chair, university of notre dame, notre dame, in james ayers, colorado mesa university, grand junction, co jerry bell, simmons university, boston, ma (retired) jesse bernstein, miami country day school, miami, fl (retired) mark decamp, university of michigan, dearborn, mi (retired) james dohm, exxonmobil, houston, tx xu duan, holton-arms school, bethesda, md kimberly gardner, united states air force academy, co paul groves, south pasadena hs, south pasadena, ca (retired) john kotz, state university of new york, oneonta, ny (retired) sarah leite, hopkins school, new haven, ct michael a. morgan, …

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r teachers for further study. allow time for students to read the directions, ask questions, and fill in the requested information on the scantron sheet. the answer sheet must be completed using a pencil, not pen. when the student has completed part i, or after one hour and thirty minutes has elapsed, the student must turn in the scantron sheet, part i of the testing materials, and all scratch paper. there are three parts to the national chemistry olympiad examination. you have the option of administering the three parts in any order, and you are free to schedule rest breaks between parts. 1 hour, 30 minutes 1 hour, 45 minutes part i 60 questions single answer, multiple-choice part ii 8 questions problem-solving, explanations part iii 2 lab problems laboratory practical 1 hour, 30 minutes a periodic table and other useful information are provided on page 2 for student reference. students …

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materials, scratch paper, and your scantron answer sheet. do not forget to turn in your u.s. citizenship/green card holder statement before leaving the testing site today. page 2 property of acs usnco – not for use as usnco national exam after april 23, 2023 abbreviations and symbols constants amount of substance n ampere a atmosphere atm atomic mass unit u avogadro constant na celsius temperature °c centi– prefix c coulomb c density d electromotive force e energy of activation ea enthalpy h entropy s equilibrium constant k faraday constant f free energy g frequency ν gas constant r gram g hour h joule j kelvin k kilo– prefix k liter l measure of pressure mm hg milli– prefix m molal m molar m molar mass m mole mol planck’s constant h pressure p rate constant k reaction quotient q second s speed of light c temperature, k t time t …

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126.9 54 xe 131.3 55 cs 132.9 56 ba 137.3 57 la 138.9 72 hf 178.5 73 ta 180.9 74 w 183.8 75 re 186.2 76 os 190.2 77 ir 192.2 78 pt 195.1 79 au 197.0 80 hg 200.6 81 tl 204.4 82 pb 207.2 83 bi 209.0 84 po (209) 85 at (210) 86 rn (222) 87 fr (223) 88 ra (226) 89 ac (227) 104 rf (261) 105 db (262) 106 sg (263) 107 bh (262) 108 hs (265) 109 mt (266) 110 ds (281) 111 rg (272) 112 cn (285) 113 nh (286) 114 fl (289) 115 mc (289) 116 lv (293) 117 ts (294) 118 og (294) 58 ce 140.1 59 pr 140.9 60 nd 144.2 61 pm (145) 62 sm 150.4 63 eu 152.0 64 gd 157.3 65 tb 158.9 66 dy 162.5 67 ho 164.9 68 er 167.3 69 tm 168.9 70 yb …

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37.9% (c) 58.3% (d) 65.5% 3. carbon tetrachloride (ccl4, m = 153.8, density = 1.59 g ml-1) and heptane (c7h16, m = 100.2, density = 0.68 g ml-1) are miscible liquids. which solution has the highest concentration of ccl4? (a) 5% v/v ccl4 in heptane (b) 5% w/w ccl4 in heptane (c) 5 mol% ccl4 in heptane (d) all three solutions have the same concentration of ccl4. 5. a 1.802-g sample of a hydrated double salt containing two different metal ions with the formula of ma(mb)2(so4)4 • 22h2o is heated strongly to drive off all the water, leaving a residue of 1.000 g. what is the identity of ma? (a) ca (b) ti (c) fe (d) ba 6. hypochlorite ion reacts with hydrogen peroxide to produce oxygen gas. ocl–(aq) + h2o2(aq) ® h2o(l) + cl–(aq) + o2(g) a series of experiments is carried out where 10.0 ml of a 0.30 …

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property of acs usnco – not for use as usnco national exam after april 23, 2023 distributed by the american chemical society, 1155 16th street, n.w., washington, dc 20036 all rights reserved. printed in u.s.a. 2023 u.s. national chemistry olympiad national exam part i prepared by the american chemical society chemistry olympiad examinations task force olympiad examinations task force seth n. brown, chair, university of notre dame, notre dame, in james ayers, colorado mesa university, grand junction, co jerry bell, simmons university, boston, ma (retired) jesse bernstein, miami country day school, miami, fl (retired) mark decamp, university of michigan, dearborn, mi (retired) james dohm, exxonmobil, houston, tx xu duan, holton-arms school, bethesda, md kimberly gardner, united states air fo...

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