AP CHEMISTRY FINAL EXAM SEMESTER 2

AP CHEMISTRY FINAL EXAM SEMESTER 2

• what effect will increasing H at constant temperature have on the reaction represented

above?: the frequency of collision between H ions and CLo ions will increase

• NH3 reacts with BF3 to form a single species. which of the following structural diagrams

is the most likely representation of the product of the reaction.: [3H on N connected with 3F on B]

• based on the information in the table above, which of the following shows the cell potential

and gibbs free energy change for the overall reaction that occurs in a standard galvanic cell: Ecell = 1.63, G = -944

• Which of the following mechanisms for the catalyzed reaction is consistent witht eh

equation and diagram above?: O3 + NO --> NO2 + O2

• The equilibrium system represented by the equation above initially contains equal

concentrations of Cr2O7 and CrO4. Which of the following statements correctly predicts the result of adding a sample of 6M NaOH to the system, and provides an explanation: the mixture will become more yellow because Oh will shift the equilibrium toward products

• the process of dissolution of NaCL isH2O is represented in the diagram above. Which of

the following summarizes the signs of H and S for each of teh dissolution process: H+ S+, H+

S+, H- S-

• which of the following particle views best represents the mixture when the titration is

halfway to the equivalence point?: 5 H2O2 ions and 2 Mn ions

• under which of the following temperature conditions is the reaction thermodynamically

favored?: it is not favored with any temperature

• based on the bond energies listed in the table above, which of the following is closest to the

bond energy of the C-N bond: 300kj/mol

• based on the thermodynamic data, which of the following is true at 298 K: 0
• three saturated solution are prepared at 25 C based on the information in teh table above,

which of the following lists the solutions in order of increasing Ag: Z

• When 5 g of NH4ClO4 is added to 100 ml of water in a calorimiter, the temperature of teh

solution formed decreases by 3 C. if 5 g of NH4ClO4 is added to 1000 mL of water in a calorimeter initially at 25 C, the final temperature of the solution will be approximately: 24.7 C

• for the system represted above, O2 and O3 initially are .15mol/L and 2.5 mol/L

respectively. Which of the following best predicts what will occur as the system approaches

equilibrium at 570K: the amount of O3 will decrease because Q>Kc

• which of the following statements identifies the greatest single reason that the value of Kp

for the overall reaction 298 k has such a large magnitude: the value of H for the overall reaction is large and negative 1 / 2

15. What is the value of the enthalpy change per mole of HCl produced: -93 kJ

• The compound CCl4 is nonflammable and was once commonly used in fire

extinguishers. On the basis of periodic properties which of the following compounds can most

likely be used as a fire-resistant chemical: CBr4

• Based on the information above, which of the following expressions represents the

equilibrium constant, K for the reaction represented by the equation below?: K=(K1)(Kw)/Ka

• What re the relaative strengths of the acids and bases in the reaction represented by the

equation above?: Acid Strength: HClO2>HCOOH

Base Strength: CLO2

• equal volumes of .1 M AgNO3 and 2M NH3 are mixed and ther eactions rep- resented above

accur. which AG species will have the highest concentration in the equilibrium system shown

below, and why?: Ag(NH3)2 because Keq3 = 1.6x10^7

• When H2 and O2 are mixed together in a rigid reaction vessel at 20 C, no reaction

occurs. when the mixture is sparked, however, the gases react vigorously according to the equation above, releasing heat. Which of the fol- lowing statements correctly explains why the spark is needed for the reaction to occur when the gases are originally

at 25 C: the reaction has a large activation energy at 25 C

• The mass spectrum of an average sample of a pure element is shown in the figure above

Y Zr Nb

Th: Zr

• The ideal gas law best describes the properties of which of the following gases

PH3 HBr SO2

N2: N2

• at 298k and 1 atm, Br2 is a liquid with a high vapor pressure, and Cl2 is a gas

forces among Br2 molecules are stronger forces among Cl2 molecules are stronger than the Cl-Cl bonds Br-Br bond is stronger than the Cl-Cl bond Cl-Cl bond is stronger than the Br-Br bond: forces among Br2 molecules are stronger than those among Cl2 molecules

• which of the following has the bonds arranged in order of decreasing polarity
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