LAST NAME, FirstCHEM 107 (Fall-2006)Exam 2 (104 pts)Name: ------------------------------------------------------------------------, Clid # ------------------------------ LAST NAME, First(Circle the alphabet segment of your LAST NAME): A-C D-H I-L M-O P-Z Please answer the following questions:Part I: Multiple Choices (52 pts: 12 @ 4 pts each + 4 pts bonus). Circle the ONE best answer:1. Calculate the molarity of 0.105 g of backing soda (NaHCO3, molar mass = 84 g/mol) in 5.0 mL of solution.a) 0.21 M b) 2.5 x 10-4 M c) 0.50 M d) 0.25 M2. For the reaction: a Na2CO3 (aq) + b HCl (aq) c NaCl (aq) + d H2O (l) + e CO2 (g) The corresponding order for the coefficients a, b, c, d and e is:a) 2, 4, 4, 2 and 2 b) 2, 2, 2, 2 and 1 c) 1, 2, 2, 1 and 1 d) 1, 2, 2, 1 and 1 3. In the above reaction, the spectator ion(s) are: a) H+ and CO32- b) Na+ and Cl- c) only CO32- d) Na+ and H+ 4. Which of the following salts are expected to be insoluble in water? a) Ca3(PO4)2b) ZnSO4 c) Na2S d) K3PO4 5. Two solutions, A and B, are labeled “0.10 M CaCl2” and “0.20 M CaCl2”, respectively. Bothsolutions contain the same number of moles of CaCl2. If solution A has a volume of 50 mL. What is the volume of solution B?a) 25 mL b) 50 mLc) 100 mL d) no answer was given 6. If 380.0 mL of 0.350 M NaOH is added to 250.0 mL of 0.532 M HNO3, will the mixture a) neutral b) basic c) acidic d) amphoteric7. How many molecules of hydrogen sulfide, H2S are contained in 0.50 L of H2S at 1 atm and 27 ˚C? a) 1.34 x 1022 b) 3.00 x 1022 1c) 1.22 x 1022 d) 2.03 x 10-2 8. Which of the following is classified as a weak base? a) HBr b) NaC2H3O2 (sodium acetate) c) HNO2d) NH3 9. Consider four identical 1.0 L flasks containing the following gases each at 25 ˚C and 1 atm pressure. For which gas do the molecules have the highest average kinetic energy?a) SO2b) O2c) H2d) same for all10. The oxidation states of chlorine in ClF3 and sulfur in S2O32- are:a) +3 and +2, respectively b) -3 and +2, respectivelyc) -3 and +4, respectively d) +3 and +6, respectively 11. What volume in milliters of 0.125 M HCl is needed to neutralize 1.48 g Ca(OH)2 (74.1 g/mol)?a) 160 b) 0.320 c) 320 d) no answer was given12. Assuming ideal gas behavior. Which of the following statements is INCORRECT?a) The pressure of the gas results from the collisions of the gas molecules with the wall of the container.b) The volume occupied by a gas depends on its temperature, pressure and number of moles.c) When the temperature of a gas sample is increased at constant pressure, the density of the gas will decrease.d) In a mixture containing O2 and N2 molecules, the O2 molecules, on the average are moving faster than the N2 molecules. 13. The gas pressure in an aerosol can is 1.5 atm at 25ºC. Assuming the gas inside obeys the ideal gas equation, what would the pressure be if the can were heated to 450ºC? a) 3.6 atm b) 27 atm c) 0.62 atm d) 0.083 atm Part II. Equations and formulas (20 pts) In the following section please include the physical states as (s, l, g aq) for reactants and products.Use the periodic chart for charges on each ion and reference sheet. Please write N. R. if there is noreaction.1. (4 pts) Write the balanced chemical equation for the reaction, if any occurs between aqueous solutions of NH4Cl and KNO3 (write N.R. if they do not react; no chemical equation) 22. (6 pts) Write the balanced chemical equation and the net ionic equation for the reaction betweenaqueous solutions of AgNO3 and CaBr2 and then identify the spectator ion(s)3. (10 pts) Balance the following redox equation in acidic solution:SO42- (aq) + Zn (s) SO2 (g) + Zn2+ (aq)Then identify the oxidizing agent and how many electron(s) are transferred per one mole of the oxidizing agent.Part III. Calculations (32 pts) Show all work for full credit. Please express all answers with the proper units and correct number of significant figures.1. (8 pts) One procedure used to separate the isotope of uranium to obtain material to construct anuclearweapon employs a uranium compound with the formula UF6. The compound boils at about 56º C, soat 100.º C it is a gas. What is the density of UF6 at 100.º C if the pressure of the gas is 740. mmHg?(Assume the gas contains the mix of uranium isotopes commonly found in nature; MM UF6 = 352.0g/mol)3Balanced equation:Oxidizing agent: --------------Number of electrons/mole of oxidizing agent: -------- Chemical equation:Net ionic equation:Spectator ion(s):Chemical equation:2. (12 pts) Under appropriate conditions, the elemental liquid bromine and aluminum produces thecompound Al2Br6 according to the equation below?2 Al (s) + 3 Br2 (l) Al2Br6 (s)If 5.00 g Al was mixed with 10.0 ml of liquid Br2 (density =3.10 g/mL) a) Determine the limiting reactant.b) If 31.8 g of Al2Br6 was obtained, then what is the %yield of the reaction? 3. (12 pts) If 7.25 g of Al and 30.7 mL of 1.22 M HNO3 are allowed to react according to the equation given below: 2 Al (s) + 6 HNO3 (aq) 3 H2 (g) + 2 Al(NO3)3 (aq) a) Determine the limiting reactant. b) What is the volume of hydrogen in liters that produced at 699 torr and 27˚C?4d = 11.2 g/L b) 34.5 g, % yield = 92.2a) L. R.: Br25b) 0.501 L of H2a) L. R.: HNO3Exam 2 – Fall 2006You will have 65 minutes to complete this exam. The exam has 4 pages plus the Periodic Table and Reference page. When you are told to do so, tear off the Periodic Table cover sheet and use as required during the exam. 11H1.01Periodic Table of the