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Name: General Chemistry First Midterm 2014 First Semester Questions from Chapter-2: Atoms and Atomic Theory 1) What is the correct symbol for the species that contains 12 neutrons, 11 protons, and 22 electrons? 2) Indicate the number of protons, neutrons, and electrons in (a) an atom of barium-135 and (b) the double negatively charged ion of selenium-80. 3) Which mass? a. b. c. d. e. of the following have the same charge and approximately the same an electron and a proton; a proton and a neutron; a hydrogen atom and a proton; a neutron and a hydrogen atom; an electron and ion. 4) We found that when 0.455 g of magnesium reacted with 2.315 g of oxygen, 0.755 g of magnesium oxide was obtained. Determine the mass of magnesium contained in a 0.500 g sample of magnesium oxide? 5) Two naturally occurring isotopes of lithium, lithium-6 and lithium-7, have masses of 6.01512 u and 7.01600 u, respectively. Which of these two occurs in greater abundance? Questions from Chapter-3: Compounds 6) Write the names of the following chemicals: a. NaCl : b. BCl3 : c. MgI2 : d. Al2O3 : e. N2O5 : 7) Write the formulas for the following chemicals: a. Iron (II) Sulfide : b. Hydrochloric acid : c. Calcium Fluoride : d. Copper (II) Chloride : e. Dinitrogen pentoxide : 8) Determine the mass in grams of! a. 6.25 * 10-2 mol P4! b. 4.03 * 1024 molecules of stearic acid, C18H36O2 c. A quantity of the amino acid lysine, C6H14N2O2, containing 3.03 mol N atoms Questions from Chapter-4: Chemical Reactions 9) Phosphorus trichloride, PCl3, is commercially important compound in the manufacture of pesticides, gasoline additives and a number of other products. Liquid PCl3 is made by the direct combination of phosphorous and chlorine. P4 (s) + 6 Cl2 (g) -> 4 PCl3 (l) What is the maximum mass of PCl3 that can be obtained from 125 g P4 and 323 g Cl2? 10) Titaniumtetrachloride,TiCl4, is prepared by the reaction below. TiO2 (s) + C(s) + Cl2 (g) ! TiCl4(g) + CO2 (g) + CO (g) First balance the equation. And find the maximum mass of TiCl4 that can be obtained from 35 g TiO2, 45 g Cl2 and 11 g C? 11) Billions of kilograms of urea, CO(NH2)2 , are produced annually for use as a fertilizer. 2NH3 (g) + CO2 (g) -> CO(NH2)2 (s) + H2O (l) If 47.7 g urea forms per mole of CO2 that reacts, what is the a) Theoretical yield, b) Actual Yield, c) Percent Yield? Questions from Chapter-5: Reactions in Water Solubility Rules: Salts of group 1 cations (with some exceptions of Li) and are NH4 !soluble. II. Nitrates, acetates, and perchlorates are soluble. III. Salts of silver, lead, and mercury(I) are insoluble. IV. Chlorides, bromides, and iodides are soluble. V. Carbonates,phosphates,sulfides,oxides,and hydroxides are insoluble !(sulfides of group 2 cations and hyadarrenodxides of Ca2+, Sr2+, Ba2+ !slightly soluble). VI. Sulfates are soluble except for those of calcium, strontium, and barium. 12) Indicate whether a precipitate forms by the following equations. If no reaction occurs, so state. (Indicate the precipitation rules) I. (a) NH4Cl (aq) + KNO3 (aq) -> (b) PbCl2 (aq) + KI (aq) ! (c) Na2SO4(aq) + Pb(NO3)2 (aq) -> 1 3 1 IA 1A H Hydrogen 1.008 Li Lithium 6.941 Na 11 Sodium 22.990 19 K Potassium 39.098 Rb Rubidium 84.468 37 55 Cs Cesium 132.905 87 Fr Francium 223.020 4 2 IIA 2A Be Beryllium 9.012 Mg 12 Magnesium 24.305 20 Calcium 40.078 Ca Sr Strontium 87.62 38 56 Ba Barium 137.327 88 Ra Radium 226.025 21 3 IIIB 3B Sc Scandium 44.956 Y Yttrium 88.906 39 57-71 22 4 IVB 4B Ti Titanium 47.88 Zr Zirconium 91.224 40 72 Hf Hafnium 178.49 104 Rf 58 23 5 VB 5B V Vanadium 50.942 Nb Niobium 92.906 41 73 Ta Tantalum 180.948 105 24 6 VIB 6B Cr Chromium 51.996 7 VIIB 7B 8 Iron 55.933 Fe 26 9 VIII 8 Rh 77 Iridium 192.22 109 Mt 63 28 10 Ni Nickel 58.693 Pd Palladium 106.42 46 78 Pt Platinum 195.08 110 Ds 64 29 11 IB 1B Copper 63.546 Cu Ag Silver 107.868 47 79 Au Gold 196.967 111 Rg Gd Gadolinium 157.25 Curium 247.070 96 Am Cm Americium 243.061 95 Europium 151.966 Eu 65 30 12 IIB 2B Zinc 65.39 Zn Cd Cadmium 112.411 48 80 Mercury 200.59 Hg 112 Cn Bk Berkelium 247.070 97 Terbium 158.925 Tb 66 5 13 IIIA 3A B Al Boron 10.811 13 Aluminum 26.982 31 Gallium 69.732 Ga In Indium 114.818 49 81 Tl Thallium 204.383 113 6 14 IVA 4A C Si Carbon 12.011 14 Silicon 28.086 32 Ge Germanium 72.61 Tin 118.71 Sn 50 82 Lead 207.2 Pb 114 Fl Flerovium [289] Uut Ununtrium unknown 7 15 VA 5A N P Nitrogen 14.007 15 Phosphorus 30.974 33 Arsenic 74.922 As Sb Antimony 121.760 51 83 Bi 8 16 VIA 6A O S Oxygen 15.999 16 Sulfur 32.066 34 Se Selenium 78.09 Te Tellurium 127.6 52 84 Po Polonium [208.982] 116 9 17 VIIA 7A F Cl Fluorine 18.998 17 Chlorine 35.453 35 Br Bromine 79.904 I Iodine 126.904 53 85 At Astatine 209.987 117 2 18 VIIIA 8A Helium 4.003 He 10 Neon 20.180 Ne Ar 18 Argon 39.948 Kr 36 Krypton 84.80 Xenon 131.29 Xe 54 Rn 86 Radon 222.018 118 Bismuth 208.980 115 Ununoctium unknown Lawrencium [262] Lr 103 Lutetium 174.967 Lu 71 Uus Uuo Yb No Nobelium 259.101 102 Ytterbium 173.04 70 Uup Lv 69 Md Mendelevium 258.1 101 Thulium 168.934 Tm Ununpentium Livermorium Ununseptium unknown [298] unknown Fermium 257.095 Fm 100 Erbium 167.26 Er 68 Es Einsteinium [254] 99 Holmium 164.930 Ho 67 Cf Californium 251.080 98 Dysprosium 162.50 Dy Meitnerium Darmstadtium Roentgenium Copernicium [268] [269] [272] [277] Samarium 150.36 Pu Plutonium 244.064 94 Ir Rhodium 102.906 45 Cobalt 58.933 Co 27 Periodic Table of the Elements 25 Mn Manganese 54.938 Ru Ruthenium 101.07 44 Tc Technetium 98.907 43 Mo 76 108 Osmium 190.23 Os Molybdenum 95.94 75 107 Rhenium 186.207 Re 42 74 W Tungsten 183.85 106 Hs Hassium [269] Bh Bohrium [264] Sg Seaborgium [266] 62 Db 61 60 Np Neptunium 237.048 93 Pm Sm 59 U Uranium 238.029 92 Nd Promethium 144.913 Pr Praseodymium Neodymium 140.908 144.24 Pa Protactinium 231.036 91 Dubnium [262] Th Thorium 232.038 90 Cerium 140.115 Ce Rutherfordium [261] Ac Actinium 227.028 89 Lanthanum 138.906 La 57 89-103 Lanthanide Series Actinide Series © 2013 Todd Helmenstine sciencenotes.org