84. Which isomers of C₄H₈ has the lowest absolute entropy at 25°C?
(A) 1-butene
(B) cis-2-butene
(C) trans-2-butene
(D) 2-methylpropene
(E) cyclobutane

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.

21. When 6 M sodium hydroxide is added to an unknown white solid, the solid is dissolved. What is a possible identity for this solid? (A) Mg(OH)2 (B) Al2(SO4)3 (C) BaCO3 (D) AgBr (E) Ca3(PO4)2 

22. A chemist wishes to separate benzoic acid from 4-hydroxybenzaldehyde. Which is the best method to achieve this separation? (A) Partitioning the mixture between diethyl ether and water. (B) Partitioning the mixture between diethyl ether and 1 M aqueous NaHCO3. (C) Partitioning the mixture between diethyl ether and 1 M aqueous NaOH. (D) Partitioning the mixture between diethyl ether and 1 M aqueous HCl. (E) Recrystallizing the mixture in diethyl ether.

23. The reaction system has already reached equilibrium. Which of the following statements is correct? (A) Additional H2O(g) added to the system will shift to the left to obtain the equilibrium. (B) As an exothermic reaction, the system will shift to the right to attain the equilibrium when temperature increases. (C) When carbon dioxide is removed, the system will shift to the left to achieve the equilibrium. (D) When volume of the reaction container is decreased, the system will shift to the right to reach the equilibrium. (E) Addition of helium gas into the reaction system will have no effects on its equilibrium.

24. Which elements are most similar in atomic size? (A) Li (Z = 3) and Na (Z = 11) (B) B (Z = 5) and Al (Z = 13) (C) Co (Z = 27) and Rh (Z = 45) (D) Zr (Z = 40) and Hf (Z = 72) (E) Be (Z = 4) and F (Z = 9)

25. In the Lewis structure of I3 – , there are _________ electrons around the central iodine atom. (A) 4 (B) 6 (C) 8 (D) 10 (E) 12

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