WordPress.com



STUDY UNIONCHM 2046 FINAL EXAM REVIEWAndy NguyenThis document can be accessed at the following link: are sourced from:Chemistry: A Molecular Approach by Nivaldo J. Tro (4th Edition)ACS General Chemistry Study GuideChapter 11: Liquids, Solids, and Intermolecular ForcesRank the following in order of increasing boiling point: CH3OH, CH3Cl, CH4, CH3CH2CH3CH3CH2CH3 < CH4 < CH3Cl < CH3OHCH3CH2CH3 < CH4 < CH3OH < CH3ClCH4 < CH3CH2CH3 < CH3OH < CH3ClCH4 < CH3CH2CH3 < CH3Cl < CH3OHCH3OH < CH3Cl < CH3CH2CH3 < CH4Which of the following contains dipole-dipole forces?CCl4HClH2OB and C onlyA, B, and CWhich of the following will cause an increase in vapor pressure?Increasing strength of intermolecular forcesIncreasing surface areaIncreasing temperatureB and C onlyA, B, and CDetermine the amount of heat (in kJ) required to vaporize 1.55 kg of water at its boiling point. For water, ΔHvap = 40.7 kJ/mol (at 100°C).3.50 x 103 kJ1.14 x 106 kJ2.89 x 105 kJ2.11 kJ686 kJUse the following phase diagram of a pure compound to find which statement is true:A C represents sublimationFollowing ABC, the compound would first melt and then vaporizeIf the compound is in state A, continued reduction of pressure (at constant temperature) will cause it to meltNone of these statements are correctChapter 12: Solids and Modern MaterialsLithium crystallizes in a body-centered cubic unit cell. What is the mass of one unit cell in grams?1.15 x 10-23 g2.30 x 10-23 g5.75 x 10-23 g1.04 x 10-22 gWhat type of solid is dry ice (solid CO2)?IonicAtomicMolecular None of the aboveCopper crystallizes in a face-centered cubic lattice. If the edge of the unit cell is 361 pm, what is the radius of the copper atom?128 pm171 pm181 pm255 pmChapter 13: SolutionsWhat is the molarity of a solution made by dissolving 8.56 g of sodium acetate in water and diluting to 750 mL? (Molar mass of NaC2H3O2 = 82.03 g/mol)5.30 M0.139 M0.104 M0.0783 MA potassium bromide (KBr) solution is 7.55% by mass and its density is 1.03 g/mL. What mass of potassium bromide is contained in 35.8 mL of the solution?2.78 g2.70 g4.88 g2.62 gWhich of these do you expect to be soluble in octane (C8H18)?CH3OHCBr4H2ONH3800 g of ethanol (C2H5OH) was added to 8.0 x 103 g of water. How much would this lower the freezing point? (Kf for water = 1.86 °C/m)3.2 °C4.1 °C8.2 °C16 °CChapter 14: Chemical KineticsUnder certain conditions, the average rate of appearance of oxygen gas in the reaction2 O3(g) 3 O2(g)Is 1.2 x 10-3 atm/s. What is the average rate, expressed in atm/s, for the disappearance of O3?8.0 x 10-41.2 x 10-31.8 x 10-35.3 x 10-3The following data were obtained from this reactionCH3Cl(g) + H2O(g) CH3OH(g) + HCl(g)[CH3Cl] (M)[H2O] (M)Initial rate (M/s)2.001.000.524.001.001.052.002.001.98What are the reaction orders?CH3Cl: first order; H2O: first orderCH3Cl: first order; H2O: second orderCH3Cl: second order; H2O: first orderCH3Cl: second order; H2O: second orderThe experimental data from a certain reaction gives these three graphs. What is the most likely order for this reaction?ZeroFirstSecondNot enough informationThe decomposition of hydrogen peroxide in the presence of iodide ion is believed to occur via this mechanism:In this mechanism, I-(aq) and IO-(aq) are, respectivelyCatalyst; intermediateIntermediate; catalystReactant; productCatalyst; catalystIntermediate; intermediateChapter 15: Chemical EquilibriumWhat is the correct equilibrium expression for this reaction?Kc=[CO]C[O2]Kc=[CO]2[C]2[O2]Kc=[2CO]2C[O2]Kc=[CO]2[O2]For the reaction 2 A(g) ? B(g), the equilibrium constant is Kp= 0.76. A reaction mixture initially contains 2.0 atm of each gas (PA = 2.0 atm and PB = 2.0 atm). Which statement is true of the reaction mixture?The reaction mixture is at equilibriumThe reaction mixture will proceed toward productsThe reaction mixture will proceed toward reactantsNot enough information to determine the direction of the reaction mixtureConsider this reaction, carried out at constant temperature and volume:What is the effect of removing some SO3 from the system initially at equilibrium?The concentration of SO2 decreases more than the concentration of O2The concentration of SO2 increases more than the concentration of O2The concentration of SO2 and O2 remain the sameThe concentration of SO2 and O2 decrease equallyConsider the reaction of A to form B:2 A(g) ? B(g) KC = 1.8 x 10-5 (at 298 K)A reaction mixture at 298 K initially contains [A] = 0.50 M. What is the concentration of B when the reaction reaches equilibrium?9.0 x 10-6 M0.060 M0.030 M4.5 x 10-6 MChapter 16: Acids and BasesWhich pair is a Bronsted-Lowry conjugate acid-base pair?H3O+; OH-ClO4-; ClO3-NH3; NH4+HCl; HBrFind the pH of a 0.350 M aqueous benzoic acid solution. For benzoic acid, Ka = 6.5 x 10-54.644.192.3211.68Which compound forms an acidic solution when dissolved in water?NH4ClNaClKNO2Ca(NO3)2Calculate [H3O+] for a solution with a pOH of 9.53.2 x 10-10 M3.2 x 10-5 M1.6 x 10-10 M1.6 x 10-5 MChapter 17: Aqueous Ionic EquilibriumWhat is the pH of a buffer that is 0.120 M in formic acid (HCHO2) and 0.080 M in potassium formate (KCHO2)? For formic acid, Ka = 1.8 x 10-4.2.333.573.743.91Consider a buffer composed of the weak acid HA and its conjugate base A-. Which pair of concentrations results in the most effective buffer?0.10 M HA; 0.10 M A-0.50 M HA; 0.50 M A-0.90 M HA; 0.10 M A-0.10 M HA; 0.90 M A-The solubility of solid silver chromate, Ag2CrO4, which has Ksp = 9.0 x 10-12 at 25 °C, is determined in water and two different aqueous solutions. Predict the relative solubility of Ag2CrO4 in the three solutionsI = II = IIII < II < IIIII = III < III < III < IWhich compound is more soluble in acidic solution than in neutral solution?PbBr2CuClAgIBaF2Chapter 18: Free Energy and ThermodynamicsWhen a material in the liquid state is vaporized and then condensed into a liquid, the steps in the process are, respectively,Exothermic and exothermicExothermic and endothermicEndothermic and exothermicEndothermic and endothermicThe combustion of ammonia is represented by this equation.4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(g) ΔH°rxn= -904.8 kJWhat is the enthalpy of formation of NH3(g)?-449 kJ/mol-46.1 kJ/mol-184 kJ/mol227 kJ/molA particular chemical reaction has a negative ΔH and negative ΔS. Which statement is correct?The reaction is spontaneous at all temperaturesThe reaction is nonspontaneous at all temperaturesThe reaction becomes spontaneous as temperature increasesThe reaction becomes spontaneous as temperature decreasesWhich reaction is most likely to have a positive ΔS?SiO2(s) + 3 C(s) SiC(s) + 2 CO(g)6 CO2(g) + 6 HzO(g) C6H12O6(s) + 6 O2(g)CO(g) + Cl2(g) COCl2(g)3 NO2(g) + H2O (l) 2 HNO3(l) + NO(g)Chapter 19: ElectrochemistryWhich of these ions is the best reducing agent?Fe3+Fe2+Cu2+Cu+What is the oxidation number of chromium in Na2Cr2O7?+12+6+3-2What is the standard cell potential, E°, for this reaction?3 Mn(s) + 2 AuCl4-(aq) 3 Mn2+(aq) + 2 Au(s) + 8 Cl-(aq)-0.18 V-2.18 V+2.18 V+5.54 VCopper is plated onto the cathode of an electrolytic cell containing CuCl2(aq). How long does it take to plate 111 mg of copper with a current of 3.8 A?1.3 x 103 s44 s89 s22 sWhich statement is true for voltaic cells?Electrons flow from the anode to the cathodeElectrons flow from the more negatively charged electrode t the more positively charged electrodeElectrons flow from higher potential energy to lower potential energyAll of the above are trueANSWER KEYDDDADBACBABBABBADBADCCABBBDDCBDADBCCD ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download