資訊推薦

• 56. 傳統方式編作輪口編時，若想固定輪口編的中心圓口徑，最常採用下列何者方式 (A)輪口套入細竹圈保持 (B)用膠帶固定篾片 (C)篾片泡水 (D)輪口處塗上白膠 。
• 57. 有關藤材的敘述，何者正確 (A)藤是寒帶植物，生長在一千公尺以上的叢林 (B)藤是一種長青的蔓生植物 (C)藤之莖生鈎刺，表面成雪白色 (D)藤常倚林 木生長，故莖部挺直 。
• 2. HF is a stronger acid than HC2H3O2. Order the following according to base strength. (A) C2H3O
• 3. What's the [H+] (in 10-7 M) in 1.0 x 10-4 M HCN? (A) 2.5 (B) 2.7 (C) 3.0 (D) 4.2 (E)
• 4. Consider five identical flasks filled with 1.0 mole different gases at 0 °C.Flask A: CO at 250 to
• 5. A certain metal fluoride crystallizes in such a way that the fluoride ions occupy simple cubic la
• 6. Which of the metal ions in the following complex has a d³ electron configuration? (A) [Ti(H2O
• 7. How many of the following molecules or ions (NF3, NO3-, BrF3, I3-, PC13, ICl3) have trigonal pyra
• 8. How many of the molecules or ions in Problem 7 have a hybridization of dsp³ on the central atom?
• 9. Consider the titration of 100.0 mL of a 0.05 M solution of the hypothetical weak acid H3X (Ka1=1.
• 10. Calculate the pH of the solution in Problem 9 after adding 50.0 mL (total) KOH. (A) 4.5 (B)
• 11. Calculate the bond energy of F2- (in kJ\/mol) by using the following data: ionization energy of
• 12. Arrange the following species in order of the shortest to the longest N-O bond:(1)H2NOH, (2)N2O,
• 13. A certain substance, X, has a triple-point temperature of 20°C at a pressure of 2.0 atm. Which o
• 14. The temperature at some planet is so high that the electronic ground state of the hydrogen atom
• 15. Arrange the elements C, N, and O in order of increasing ionization energy. (A) C, N, O (B)
• 16. 1.0 mole monatomic ideal gas at 300 K and 10.0 atm is expanded adiabatically and reversibly to 1
• 17. What's the work (in R) in Problem 16? (A) -210 (B) -270 (C) -360 (D) -320 (E) -440
• 18. A certain reaction has the following general form: a A → bB.At a particular temperature and [A]o
• 2. Compound X2Y is 60% X by mass. Calculate the percent Y by mass of the compound X2Y2. (A) 30% (B)
• 19. The reaction 2 NO(g) + O2(g) → 2 NO2(g) is believed to take place bythe following mechanism:(1)
• 3. The following unbalanced reaction occurs in basic media:Fe2+ + Cr2O72- → Fe3+ + Cr3+The coefficie
• 4. How is the observed pressure of a gas related to the ideal pressure? (A) The relationship depends
• 5. For the reaction 2H2(g) + O2(g) ⇌ 2H2O(g), what is the relationship between K and Kp at temperatu
• 20. Consider the reaction 3A+B+CD + E, where the rate law is defined as-d[A]dt =(1.66x102 L³\/mol³