AP Chemistry 2008 Multiple Choice (1)

AP Chemistry 2008 Multiple Choice (1) - 2008MultipleChoice...

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  2008 Multiple Choice Part A Questions 1-3 refer to the following types of elements in the periodic table. (A) Noble gases (B) Alkali metals (C) Halogens (D) Transition elements (E) Actinides 1. Are the most difficult to oxidize in a given period of the periodic table 2. Are always radioactive 3. Are the most likely to form anions Questions 4-6 A solution of a weak monoprotic acid is titrated with a solution of a strong base, KOH.  Consider  the points labeled (A) through (E) on the titration curve that results, as shown below. 4. The point at which the moles of the added strong base are equal to the moles of the  weak acid initially present
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  5. The point at which the pH is closest to that of a the strong base being added 6. The point at which the concentrations of the weak acid and its conjugate base are  approximately equal Questions 7-9 refer to the following pure substances, which are gases at 25  o C and 1  atmosphere (A) NH 3 (g) (B) BH 3 (g) (C) H 2 (g) (D) H 2 S(g) (E) HBr(g) 7. Has molecules with a pyramidal shape 8. Is a strong electrolyte in aqueous solution 9. Is the slowest to effuse through a small opening at 25  o C and 1 atm Questions 10 – 11 refer to the following (A) Activation energy (B) Enthalpy of formation (C) Entropy (D) Gibbs free energy (E) Lattice energy 10. Quantity that would be zero for a pure, perfect crystal at 0 K 11. Quantity typically determined by measuring the reate of a reaction at two or more  different temperatures Questions 12 – 14 refer to the following combinations of enthalpy changes ( Δ H) and entropy  changes ( Δ S) for chemical reactions.
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  12. Must be true for a reaction that is spontaneous at all temperatures 13. True for the evaporation of water at 25  o C and 1 atm. 14. True for the combustion of liquid pentane, C 5 H 12  (l), to form H 2 O(g) and CO 2 (g) at 1 atm Questions 15-17 refer to the following reactions (A) 2 Mg(s) + O 2 (g)   2 MgO(s) (B) Pb 2+ (aq) + CrO 4 2- (aq)   PbCrO 4 (s) (C) SO 3 (g) + 2 H 2  H 3 O + (aq) +HSO 4 - (aq) (D) 2 H 2 O(g)   2 H 2 (g) + O 2 (g) (E) Ag + (aq) + 2 NH 3 (aq)   [Ag(NH 3 ) 2 ] + (aq) 15. A precipitation reaction 16. A Lewis acid-base reaction that produces a coordination complex 17. An oxidation-reduction reaction that is also a synthesis reaction. Part B
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