49.
(A)3
(B)4
(C)5
(D)6

45.(A)(B)(C) (D)

46. (A)    (B)(C)(D)

47.  (A)(B)(C)(D)

48.  (A)0.1(B)1.0(C)7.0(D)13.0

50. (A) (B) (C) (D) 

16. Carbon monoxide is commonly used to reduce ores to produce free metals and carbon monoxide is converted to ______. (A) carbon dioxide (B) carbon black (C) methane (D) graphite (E) carbon nanotube

17. Which of the following is the correct order of boiling points for KNO3, CH3OH, C2H6, and Ne? (A) KNO3 ＜ CH3OH ＜ C2H6 ＜ Ne (B) CH3OH ＜ Ne ＜ C2H6 ＜ KNO3 (C) Ne ＜ C2H6 ＜ KNO3 ＜ CH3OH (D) Ne ＜ C2H6 ＜ CH3OH ＜ KNO3 (E) C2H6 ＜ Ne ＜ CH3OH ＜ KNO3

18. How many chiral centers are in this molecule? (A) 0 (B) 1 (C) 2 (D) 3 (E) 4

19. Which of the following statements is incorrect? (A) A triple bond is composed of two π bonds and one σ bond. (B) π bonds result from the head-to-head overlap of atomic orbitals. (C) Free rotation does not occur about a double bond. (D) π bonds have electron density on the inter-nuclear axis. (E) More than one of these statements are incorrect.

20. Which of the following statements is incorrect? (A) The reaction constant might change when the reaction temperature changes. (B) The reaction constant won’t change when the concentration of reactants changes. (C) The reaction constant might change when the catalyst is added to the reaction. (D) The activation of energy for a reaction might change when the catalyst is added. (E) The activation of energy for a reaction might change when the reaction temperature changes.