3. You should the advice given by your parents. They have more experience than you after all.
A. bother B. think C. value D. bear
2. The boy did fairly well in the examination, but he failed this time.
A. somewhat B. somehow C. anyhow D. just
1. Most of what has been said about the Smiths also true of the Greens.
A. are B. is C. being D. to be
(2) 反應達平衡時,混合氣體的體積為716.
(3)原混合氣體與平衡混合氣體的總物質的量之比(寫出最簡整數(shù)比,下同)。
n1(始)∶n1(平)= 。
(4) 原始混合氣體中,a∶b= 。
N
2NH
(1) 若反應進行到某時刻t時,n1(N2)=13 mol,n1(NH3)=6 mol,計算a的值。
30.(6分)恒溫下,將a mol N2與b mol H2的混合氣體通入一個固定容積的密閉容器中,發(fā)生如下反應:
(4)Z2跟C在常溫時發(fā)生反應③,在加熱條件下發(fā)生的反應是
3Z2+
3mol Z2與足量的C溶液反應,轉移電子的物質的量n(e―)的取值范圍是________________。
29.(12分)短周期元素X.Y.Z的原子序數(shù)依次增大,X和Y同主族,Y和Z同周期,Y與Z能形成離子個數(shù)比為1┱1的離子化合物A,X與Z能形成原子個數(shù)比為1┱1的共價化合物B,它們之間能實現(xiàn)如圖17所示轉化(部分產物已略去):
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