13. 以下哪一對化學式與其命名是不正確?(A) K2CO3,potassium carbonate (B) NH4Br,ammonium bromide(C) MnO2,manganese (IV)
15. 請計算以下反應的△H°:2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) 以下為相關成分的 Standard Enthalpies of Formation (△Hf°
5. 根據分子軌域理論預測氧氣(O2)具有順磁性。其最佳之理由為何?(A) 氧氣的鍵級(bond order)等於 2(B) 鍵結軌域(bonding orbitals)中的電子數大於反鍵結軌域(an
6. 下列原子的半徑大小順序,何者正確(由小到大排列)?(A) O < F < S < Mg < Ba (B) F < O < S < Mg < Ba(C) F < O < Mg < S < Ba (
20. Which of the following statements is incorrect?(A) The reaction constant might change when the r
21. When 6 M sodium hydroxide is added to an unknown white solid, the solid is dissolved.What is a p
22. A chemist wishes to separate benzoic acid from 4-hydroxybenzaldehyde. Which is the best method t
27. Which organic base is NOT found in RNA?(A) Uracil (B) Cytosine (C) Thymine (D) Adenine (E) Guani