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Ap Chem Questions Essay

854 words - 4 pages

46. A sample of H2S gas is placed in an evacuated, sealed container and heated until the following decomposition reaction occurs ay 1000K:

2 H2s(g) →2 H2 + S2 Kc=1.0x10^-6
Which of the following represents the equilibrium constant for this reaction?







Correct Answer: A
47. Which of the following graphs would best represent the change in concentration of the various species involved in the reaction over time?










Correct Answer: C

48. Which option best describes what will immediately occur to the reaction rates if the pressure on the system is increased after it has reached equilibrium?
(A) The rate of ...view middle of the document...

Correct Answer: A




51. An unknown substance is found to have a high melting point. In addition, it is a poor conductor of electricity and does not dissolve in water. The substance most likely contains
(A) Ionic bonding
(B) Nonpolar covalent bonding
(C) Covalent network bonding
(D) Metallic bonding
Correct Answer: C
52. Which of the following best explains why the ionization of atoms can occur during photoelectron spectroscopy, even though ionization is not a thermodynamically favored process?
(A) It is an exothermic process due to the release of energy as an electron is liberated from the Coulombic attraction holding it to the nucleus.
(B)The entropy of the system increases due to the separation of the electron from its atom.
(C) Energy contained in the light can be used to overcome the Coulombic attraction between electrons and the nucleus.
(D) The products of the ionization are at a lower energy state than the reactants.
Correct Answer: C











53.





The above diagrams show the composition of hydrogen peroxide in a sealed container in the presence of a catalyst. What is the overall order for the reaction?
(A) Zero Order
(B) First Order
(C) Second Order
(D) Third Order
Correct Answer: B
54.



One of the resonance structures for the nitrite ion is shown above. What is the formal charge on each atom?
Ox N Oy
(A) -1 +1 -1
(B) +1 -1 0
(C) 0 0 -1
(D) -1 0 0
Correct Answer: D

Use the following to information to answer questions 55-57
Atoms of four elements are examined: carbon, nitrogen, neon, and...

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