Sample Final Exam

Sample Final Exam - CHEM 101 SAMPLE EXAM (FINAL): The...

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CHEM 101 SAMPLE EXAM (FINAL): The answers are on a separate document. If I were you, i’ll answer first before looking at the answers. (1) Which formula/name combination(s) is (are) incorrect? 1) Be3N2 / berium nitride 2) (NH4)2S / ammonium sulfide 3) CuCO3 / copper(II) carbonate 4) SF4 / sulfur(IV) fluoride (2)The following reaction is important in the recovery of gold from ores: a Au + b KCN + c O2 + d H2O --> e KAu(CN)2 + f KOH The sum, (a+b+c+d+e+f), of the smallest integer coefficients in the balanced equation is 23 12 16 8 18 (3) Naturally occurring Mg has three isotopes: Mg-24 (23.99 amu), Mg-25 (24.99 amu) and Mg-26 (25.98 amu). The natural abundance of Mg-24 is 79.00%. What is the abundance (%) of Mg-25 ? 10.50 11.01 10.00 21.00 not enough information given to answer. (4) Main-group 8 elements have which of the following properties? 1) They are gases at room temperature and 1 atm pressure 2) They are easily ionized and thus conduct electricity in the liquid state 3) They are very stable substances and react with few other elements 4) They are shiny, low melting, solids and are good conductors of heat and electricity 2 (5) The compound ferrocene is 64.46% carbon by mass. If there are ten carbon atoms in one ferrocene molecule, what is the molecular mass (amu) of ferrocene?
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774.7 120.1 645.6 186.3 7754 (6) 50.0 mL of 0.10M AgNO3 (aq) is added to 25.0 mL of 0.050M NaCl(aq). The reaction AgNO3(aq) + NaCl(aq) --> AgCl(s) + NaNO3(aq) occurs. What is the molar concentration of Ag+(aq) in the solution? 0.025 0.125 0.0 0.0375 0.050 (7)Given: ZrC(s) + 4Cl2(g) --> ZrCl4(g) + CCl4(g) ZrCl4(g) + 2 Mg(s) --> Zr(s) + 2 MgCl2(s) How many grams of Cl2(g) are required to produce 175g of Zr(s)? 544 136 700 103 364 (8) A type of sandstone consists of silica, SiO2, and calcite, CaCO3. When the sandstone is heated, CaCO3 decomposes to CaO(s) and CO2(g). If 21.8 g of sandstone produces 4.29 L of CO2(g) at 1.0 atm and 573 K, what is the mass-percent of silica in the rock? 17.2 41.8 19.3 58.3 25.1 (9)How many liters of NH3(g), measured at 273 K and 1.0 atm, are required to prepare 25.0 mL of 2.50M NH3(aq)? 56 0.063 1.40 0.56 1400 (10) Which of the following statements is (are) true? 1) PV=nRT is a good approximation for real gases, especially at high pressure and low temperature. 2) An ideal gas is made up of molecules or atoms with no intermolecular attractions and with negligible volume. 3) At very high pressure, the deviation of a real gas from ideality is due primarily to finite molecular or atomic volume. 4) For the noble gases, the value of the Van der Waals b parameter increases in the order Ne < Ar < Kr < Xe.
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3 (11) 1.35 atm of PCl5(g) is introduced into an evacuated 1.00 L container. After one hour, 24.0% of the PCl5 has decomposed to PCl3(g) and Cl2(g),
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Sample Final Exam - CHEM 101 SAMPLE EXAM (FINAL): The...

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