MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

Transcription

1 Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What species is represented by the following information? 1) p+ = 17 n = 18 e- = 18 A) Ar B) Kr C) Cl- D) Ar+ E) Cl 2) Predict the charge that an aluminum ion would have. 2) A) 1+ B) 5- C) 1- D) 2+ E) 3+ 3) A g sample of N2 reacts with 3.02 g of H2 to form ammonia (NH3). If ammonia is the only product, what mass of ammonia is formed? A) 1.10 g B) g C) g D) 3.02 g E) g 3) 4) Which of the following is an ionic compound? 4) A) SCl2 B) Cl2O C) Mg3(PO4)2 D) PF5 E) CH2O 5) Write the formula for barium nitrite. 5) A) Ba3N2 B) Ba(NO2)2 C) BaNO3 D) B(NO2)3 E) BN 6) Write the name for Sn(SO4)2. Remember that Sn forms several ions. 6) A) tin sulfide B) tin (II) sulfite C) tin (I) sulfate D) tin (I) sulfite E) tin (IV) sulfate 7) Write a balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate. A) Al(CO2)3 (aq) + (NH4)3PO3 (aq) AlPO3 (s) + 3 NH4CO2 (aq) B) Al(C2H3O2)2 (aq) + (NH4)2PO4 (aq) AlPO4 (s) + 2 NH4C2H3O3 (aq) C) Al(CO3)2 (aq) + (NH3)2PO4 (aq) AlPO4 (s) + 2 NH3CO3 (aq) D) Al(C2H3O2)3 (aq) + (NH4)3PO4 (aq) AlPO4 (s) + 3 NH4C2H3O3 (aq) E) Al(C2H3O2)2 (aq) + (NH3)2PO4 (aq) AlPO4 (s) + 2 NH3C2H3O3 (aq) 7) 1

2 8) How many N2O4 molecules are contained in 76.3 g N2O4? The molar mass of N2O4 is g/mol. A) N2O4 molecules B) N2O4 molecules C) N2O4 molecules D) N2O4 molecules E) N2O4 molecules 8) 9) Determine the empirical formula for a compound that is 36.86% N and 63.14% O by mass. 9) A) NO3 B) N2O C) NO2 D) N2O3 E) NO 10) According to the following balanced reaction, how many moles of NO are formed from 8.44 moles of NO2 if there is plenty of water present? 10) 3 NO2(g) + H2O(l) 2 HNO3(aq) + NO(g) A) 1.83 moles NO B) 2.81 moles NO C) 5.50 moles NO D) 8.44 moles NO E) 25.3 moles NO 11) According to the following reaction, how many grams of sulfur are formed when 37.4 g of water are formed? 2 H2S(g) + SO2(g) 3 S(s) + 2H2O(l) 11) A) 56.1 g S B) 66.6 g S C) 99.8 g S D) 14.0 g S E) 44.4 g S 12) Determine the percent yield of a reaction that produces g of Fe when g of Fe2O3 react with 17.82g Al according to the following reaction. 12) Fe2O3(s) + 2 Al(s) Al2O3(s) + 2 Fe(s) A) % B) % C) % D) % E) % 13) Determine the molarity of a solution formed by dissolving 468 mg of MgI2 in enough water to yield 50.0 ml of solution. A) M B) M C) M D) M E) M 13) 14) How many moles of LiI are contained in ml of M LiI solution? 14) A) mol B) mol C) mol D) mol E) mol 2

3 15) Determine the concentration of a solution prepared by diluting 25.0 ml of a stock M Ca(NO3)2 solution to ml. A) M B) 1.13 M C) M D) M E) M 15) 16) What volume (in ml) will a sample of F2 gas occupy in a syringe at 5.5 atm, if the F2 has a volume of 25.0 ml at 1.2 atm? A) 3.8 ml B) 11 ml C) 5.5 ml D) 7.6 ml E) 17 ml 16) 17) To what volume will a sample of gas expand if it is heated from 50.0 C and 2.33 L to C? 17) A) 4.38 L B) 17.9 L C) 9.74 L D) 10.3 L E) 5.58 L 18) Determine the density of CO2 gas at STP. 18) A) 4.46 g/l B) 1.96 g/l C) 1.80 g/l D) 2.24 g/l E) 5.10 g/l 19) A gas mixture contains CO, Ar and H2. What is the total pressure of the mixture, if the mole fraction of H2 is 0.35 and the pressure of H2 is 0.58 atm? A) 2.1 atm B) 0.20 atm C) 1.7 atm D) 0.60 atm E) 0.49 atm 19) 20) Which of the following statements is TRUE? 20) A) The larger a molecule, the faster it will effuse. B) At very high pressures, a gas will occupy a larger volume than predicted by the ideal gas law. C) For a given gas, the lower the temperature, the faster it will effuse. D) Particles of different masses have the same average speed at a given temperature. E) None of the above statements are true. 21) Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining J of heat? A) 50.0 g Al, CAl = J/g C B) 50.0 g Cu, CCu= J/g C C) 25.0 g Ag, CAg = J/g C D) 25.0 g granite, Cgranite = 0.79 J/g C E) 25.0 g Au, CAu = J/g C 21) 22) Calculate the amount of heat (in kj) necessary to raise the temperature of 47.8 g benzene by 57 K. The specific heat capacity of benzene is 1.05 J/g C A) 2.59 kj B) 1.61 kj C) 3.85 kj D) 2.86 kj E) 16.6 kj 22) 23) Which of the following types of electromagnetic radiation has the shortest wavelength? 23) A) blue B) yellow C) orange D) green E) violet 24) Which of the following transitions (in a hydrogen atom) represent absorption of the smallest frequency photon? A) n = 5 to n = 6 B) n = 1 to n = 2 C) n = 5 to n = 4 D) n = 4 to n = 1 E) n = 1 to n = 3 24) 3

4 25) In which orbital below would an electron (on average) be closest to the nucleus? 25) A) 2s B) 3p C) 5d D) 4s E) 2p 26) Which of the following signs on q and w represent a system that is doing work on the surroundings, as well as losing heat to the surroundings? A) q = -, w = + B) q = -, w = - C) q = +, w = - D) q = +, w = + E) None of these represent the system referenced above. 26) 27) Use the H f information provided to calculate H rxn for the following: 27) H rxn =? SO 2 Cl 2 (g) -364 H2O(l) -286 HCl(g) -92 H 2 SO 4 (l) -814 H f (kj/mol) SO2Cl2 (g) + 2 H2O(l) 2 HCl(g) + H2SO4(l) A) -256 kj B) -62 kj C) -422 kj D) +161 kj E) kj 28) Place the following in order of increasing radius. 28) Br Na Rb A) Rb < Br < Na B) Br < Na < Rb C) Na < Rb < Br D) Rb < Na < Br E) Br < Rb < Na 29) Place the following in order of decreasing bond length. 29) H-F H-I H-Br A) H-I > H-F > H-Br B) H-F > H-I > H-Br C) H-Br > H-F > H-I D) H-F > H-Br > H-I E) H-I > H-Br > H-F 4

5 30) Draw the Lewis structure for NO2 including any valid resonance structures. Which of the following statements is TRUE? A) The nitrite ion contains two N-O single bonds. B) The nitrite ion contains one N-O single bond and one N=O double bond. C) The nitrite ion contains two N-O bonds that are equivalent to bonds. 30) D) The nitrite ion contains two N=O double bonds. E) None of the above are true. 31) Place the following in order of increasing A-X bond angle, where A represents the central atom and X represents the outer atoms in each molecule. 31) HCN H2O H3O A) H2O < HCN < H3O B) H2O = H3O < HCN C) HCN < H3O < H2O D) H2O < H3O < HCN E) H3O < H2O < HCN 32) Determine the electron geometry (eg), molecular geometry (mg), and polarity of SO3. 32) A) eg=tetrahedral, mg=trigonal pyramidal, polar B) eg= trigonal bipyramidal, mg=trigonal planar, polar C) eg=trigonal planar, mg=trigonal planar, nonpolar D) eg=trigonal pyramidal, mg=bent, nonpolar E) eg=tetrahedral, mg=tetrahedral, nonpolar 5