48. Which of the following is the most abundant metal on earth?(A) calcium (B) iron (C) copper (D) a
49. Choose the element that is the strongest reducing agent in the gas phasc.(A) Li (B) Na (C) K (D)
50. Which group contains two elements that exhibit +2 and +4 oxidation states?(A) Group 1A (B) Group
36.Sodium reacts violently with water according to the equation:2 Na(s) + 2 H2O(l)→ 2 NaOH(aq) +H2(g
40.The functional groups in the molecule below are (A) alkane, aldehyde, and ester.(B) alkane, aldeh
6.25℃下,乙炔(C2H2(g))的燃燒熱是-1299kJ/mol,CO2(g)和H2O(l)的標準生成熱ΔHfo分別是-393kJ/mol和-286kJ/mol。乙炔的標準生成熱是多少?(A)23
7.將NH4NO3置於一真空容器內,加熱使其進行分解反應如下:NH4NO3(s)⇌N2O(g)+2H2O(g)此反應在500℃達平衡時,發現容器內氣體總壓力為2.25大氣壓,請問其Kp為何?(A)45
9.某化學反應2A+B→2C+D,ΔH<0,則下列敘述何者錯誤?(A)該放熱反應之反應速率隨溫度之降低而增加(B)降低溫度會使平衡常數變大(C)達平衡時,平衡常數K=[C]2[D]/[A]2[B](D
10.下列有關催化劑的敘述,何者正確?(A)可藉催化劑以改變化學反應的平衡常數(B)可藉催化劑以改變化學反應進行的路徑(C)催化劑可提高正反應的速率,並降低逆反應的速率(D)可藉催化劑以改變化學反應的
8.依據下列各離子之標準還原電位,判斷哪一種試劑之氧化力最強?MnO4-+8H++5e-→Mn2++4H2O;Eo=+1.51V Cr3++3e-→Cr;Eo=-0.74V Co2++2e-→Co;E