3. The number of wall impacts per second versus the square root of Kelvin temperature for 1 mol of an ideal gas at constant volume. Which graph represents the plot?
(A)
(B)
(C)
(D)
(E) none of these

39. 已知建築物室內空間形狀為長 8 公尺、寬 5 公尺、高 3 公尺，今有一起小規模火災(1.5 公尺×1.5 公尺)發生於室內某處，試預估當濃煙煙層(smoke layer)下降到離地板高度 1.5 公尺處約需 10 秒，若建築物空間形狀變為長 10 公尺、寬 8 公尺，其餘條件皆不改變，則煙層下降到離地板高度 1.5 公尺處，約需時多少？ (A) 5 秒 (B) 10 秒 (C) 20 秒 (D) 40 秒

40. 可燃性液體之溫度升高，蒸氣發生之速度增加，液面上之混合氣引火後始能繼續燃燒，此一能使燃燒持續之溫度稱為： (A) 燃燒點(Burning point) (B) 發火點(Self-ignition point) (C) 閃火點(Flash point) (D) 引火點

1. A system at a state of chemical equilibrium is (A) microscopically dynamic and macroscopically static (B) microscopically dynamic and macroscopically dynamic (C) microscopically static and macroscopically static (D) microscopically static and macroscopically dynamic (E) none of these

2. The value of the equilibrium constant K depends on: I: the initial concentrations of the reactants； II: the initial concentrations of the products, III: the final concentrations of the reactants, IV: the final concentrations of the products. (A) I and II only (B) II and III only (C) III and IV only (D) three of these (E) none of these

4. Which statement about kinetic energy (K.E.) is true? (A) all objects moving with the same velocity have the same KE (B) as the velocity of a body increases, its K.E. decreases (C) the K.E. of a body will double if its velocity doubles (D) the K.E. of a body is independent of its mass (E) none of these statements is true

5. Aqueous solutions of lead nitrate and potassium chloride are mixed and a precipitate forms. Which pair of ions are spectator ions? (A) (B) (C) (D) (E) all of above

6. Balance the reaction below in acidic aqueous solution, using the oxidation number method. In the balanced equation, what is the coefficient of ?  (A) 1 (B) 4 (C) 5 (D) 7 (E) 8

7. You have separate aqueous solutions of NaOH and Ca(OH)2 with the same concentrations. You wish to neutralize an aqueous solution of HCl. Which basic solution would require more volume to neutralize the acid? (A) the NaOH solution (B) the Ca(OH)2 solution (C) you need to know the concentrations of the basic solutions to answer this question (D) you need to know the volume and concentration of the HCl solution to answer this question (E) you need to know the concentrations of the acid and bases and the volume of the acid to answer this question

8. As water is heated, its pH decreases. This means that (A) the water is no longer neutral (B) (C) two of these are correct (D) none of these is correct

9. The acids HC2H3O2 and HF are both weak, but HF is a stronger acid than HC2H3O2. HCl is a strong acid. Order the following according to base strength. (A) (B) (C) (D) F¯ ＞ (E) none of these