Partial preview of the text
Download CHEM 1201 (Basic Chemistry) – Exam 1 Form 2 | Accurate & Updated LSU Study Material and more Exams Chemistry in PDF only on Docsity!
2 exam 17 Fame Mu LTIPLE CHOICE. Choose the one alternative that best completes the statement or Nswers the question, Which combination of protons, neutrons, and electrons is correct for the isotope of nickel, 2gNi? A) 28 pt, 62 n°, 28 e- B) 34 pt, 28 n’, 34 e- - C) 62 pt, 28 n°, 62 e- bE D) 34 pt, 34°, 34.e- ~ __ e * Bias @)28p , 34 n°, 28 2) How many of the following numbers contain 3 significant figures? 0.4084 —-9.040 » 0.0400" 9.05x 1024 ~ A) one B) two a three Y D) four 2 E) none of these : a 3) What is the chemical formula for chromiumiIIl) sulfate? (@)er2(804)s v B) CroS3 C) Cr3S04 D) Cr3S E) none of these Vv 4) Osmium has a density of 22.6 g/mL. What volume (in mL) would be occupied by a 21.8 g sample of osmium? mM P (D- ow 4) 59 A) 2.03 x 10- . - 2.03 x 103 Qvem a ae CATE the 0.965 22.lo7 mt D) 1.04 v E) 493 me C D _— ay ho Exam 1 = Foung 5) The element X has three naturally occurring isotopes, The masses (amu) and % pundances of the isotopes are given in the table below. The average atomic masa of the soment 's amu. sotope [Abundance Mass _—| x _|7422 20.9 12.78 220.0 X__ [13.00 18.1 A) 218.5 B) 219.7 C) 221.0 D) 220.42 E) 220.4 6) The correct name for N20z4 is A) nitric oxide B) nitrogen tetroxide C) nitrogen oxide D) nitrous oxide [ (E) dinitrogen tetroxide —_——_ 7) What is the volume (in cm3) of a 25.2 g piece of metal with a density of 8.75 g/cm3? =- ™)v Si 2.88 (© we 28-39 -7,aa 6.65 oven 8.95 km? ‘ C) .425 — D) 19.5 2 E) none of the above m N= 7; Exam 1 — Form2 ew element was recently discovered and found to have an atomic weight of 342.38 43) 4 "This element has two isotopes, the lighter of which has a mass of 340.91 amu and an amindance of 68.322%. Whatis the mass of the heavier isotope? a 3%) + (x)(A). 67870) A) oT (80.41 dans) lo8.32 8) 360.21 441,33 > Add F x (3°. 61690) puss 47,33 - 232,42 =x Gl 019%) . joa. = x (31. 670%) D 2349-55 —— 14) Which of the following represent isotopes? A: 2X B: 32x Gy 2x D: 33x on and B A and C e) AandD P) D)C and D E) none of these — 15) Iron has a density of 7.9 gicm3. What is the mass of a cube of iron with the length of one side equal to 55,0 mm? A) 4.3 * 102g B)2.3* 10-2g — C)2.1* 104g bE D)14g _——— Oise 1030 16) Write the name for SnS. A) tin (!) sulfate tin (Il) sulfate tin (II) sulfide C tin (I) sulfide E) tin sulfide 1 | rorm2 4- 17) Determine the name for I20. . A) iodate B) iodine Oxide C) lodine (Il) oxide : a diiodine Monoxide D lodine (I) oxide a 18) How many signifi ((165.7-143) + 4.08] cant figures are there in the answer for the following problem? het 143) + 4.08] 0.800 =? A) one B) two rio) three )) four — E) none of these 19) What is the identity of element Q if the ion Q2+ contains 54 electrons? A) Xe Sn Ba > Te —_— E) none of these 20) The recommended adult dose of Elixophyllin®, a drug used to treat asthma, is 6.00 mg/kg of body mass. Calculate the dose in milligrams for a 110-Ib person. 1 Ib = 453.59 g HSB, GAY | ee ©0049 ef el A) 3.0 x 105 _— ——— = 2a4 1.488 MO Ye 16 1000 9 1 c)15 D) 25 99 
