88. Which of the following molecules is achiral?
(A) I
(B) II
(C) III
(D) IV
(E) V

84. Aluminum (Al) metal crystallizes in a face-centered cubic structure. The relationship between the radius r of an Al atom and the length of an edge E of the unit cell is________. (A) r = 0.354E (B) r = 0.433E (C) r = 0.5E (D) r = 2E (E) r = 4E

85. Which of the following statements correctly describes the signs of q (heat) and w (work) for the following exothermic process at P = 1 atm and T = 370 K? H2O(g) ―→ H2O(l) (A) The q and w are both negative. (B) The q is positive, but the w is negative. (C) The q and w are both positive. (D) The q is negative, but the w is positive. (E) The q and w are both zero.

86. Carminic acid, a naturally occurring red pigment extracted from the cochineal insect, contains 53.66% C, 4.09% H and 42.25% O by mass. A titration required 10.00 mL of 0.5 M NaOH to neutralize 2.46 g carminic acid. Assuming there is only one acidic hydrogen per molecule, what is the empirical formula and molecular formula of carminic acid? (Na = 23.0 g/mole) (A) empirical formula: C22H20O13； molecular formula: C44H40O26 (B) empirical formula: C22H20O13； molecular formula: C22H20O13 (C) empirical formula: C44H40O26； molecular formula: C22H20O13 (D) empirical formula: C26H20O10； molecular formula: C26H20O10 (E) empirical formula: C26H20O10； molecular formula: C52H40O20

87. Biphenyl (C12H10) is an organic molecule formed by connecting two benzene rings via single bond. Which of the following statements about biphenyl molecules is incorrect? (A) Benzene is an aromatic compound. (B) The molecular structure has twelve carbon atoms in a coplanar fashion. (C) The molecular structure has five hydrogen atoms in a coplanar fashion. (D) The molecule has a total of six double bonds. (E) The molecular hybridization in this molecule are the same as graphite.

89. Which of the following molecules possesses the strongest acidity? (A) I (B) II (C) III (D) IV (E) V

90. What monomer(s) is/are needed to synthesize the polymer shown below? I. HOCH2CH2OH II. HOOCCH2CH2COOH III. HOCH2CH2COOH IV. HOCH=CHOH V. HOOCCH=CHCOOH (A) II (B) III (C) I and II (D) IV and V (E) II and III

1. 如圖一所示，PQ 是一個質量忽略的平台，由一個輕彈簧支撐，彈簧的另一端固定在地面。一重物 m 從高處落下並黏在平台上，設整個過程中彈簧受力一直處於彈性限度內，此重物 m 在第一次降到最低點前，在什麼時候相對於地面的速度最大？(A) 重物 m 非常接近平台時 (B) 重物 m 落到平台但彈簧還未形變時 (C) 當彈簧被壓縮到最大限度時 (D) 當彈簧彈力等於重物的重力時

2. 如圖二所示，AB 為半圓形軌道，半徑為 R。一小球以初速度 Vo 沿水平地面向左運動，恰能沿軌道上行至頂點 B 而後飛出，則小球落地點離軌道下端 A 的距離為下列何者？ (A)(B)(C)(D) 2R

3. 圖三中，一質量為 m 的球繫於一彈力常數為 k 的鉛直彈簧上端，平衡時，彈簧被壓縮的距離x0。若將位於平衡點的球再下壓的距離，使球作鉛直振動，求球的最大速率為多少？(以m、g、k表示) (A)(B)(C)(D)

4. 一個人造衛星繞地球作橢圓運動，設地球密度均勻，半徑為 R，在地表的重力加速度為 g。人造衛星繞地球作橢圓運動時，近日點距地心 2R，遠日點距地心 6R，則近日點處的軌道速度量值為多少？ (A)(B) (C)(D)