试题与答案

(8分)短周期元素Q、R、T、W在元素周期表中的位置如图所示,其中,T所处的周期

题型:填空题

题目:

(8分)短周期元素Q、R、T、W在元素周期表中的位置如图所示,其中,T所处的周期序数与主族序数相等。请回答下列问题:

(1)T的原子结构示意图为________。

(2)元素的非金属性(原子的得电子能力):Q________W(填“强于”或“弱于”)。

(3)W的单质与其最高价氧化物的水化物浓溶液共热能发生反应,生成两种物质,其中一种是气体,反应的化学方程式为__________________________。

(4)原子序数比R多1的元素的一种氢化物能分解为它的另一种氢化物,此分解反应的化学方程式是__________________。

(5)R有多种氧化物,其中甲的相对分子质量最小。在一定条件下,2 L的甲气体与0.5 L的氧气相混合,若该混合气体被足量的NaOH溶液完全吸收后没有气体残留,所生成R的含氧酸盐只有一种,则该含氧酸盐的化学式是________________。

(6)在298K下,Q、T的单质各1 mol完全燃烧,分别放出热量a kJ和b kJ。又知一定条件下,T的单质能将Q从它的最高价氧化物中置换出来,若此置换反应生成3 mol Q的单质,则该反应在298K下的ΔH=________(注:题中所涉单质均为最稳定单质)。

答案:

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参考答案:A

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Then he lifted the little girl up and set her feet into the shoes. “Take your time,” he said, “I get tired of moving them around, and it’s good to just sit here and eat my ice cream.”

The shining eyes of the little girl could not be missed as she ordered her ice cream.

He was a big man, all right. Big body, big shoes, but most of all, he had a big heart.

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A.she was dirty

B.she had no money

C.the store was closed

D.she had no shoes on小题2:What happened to the little girl in the end?

A.The big man bought an ice cream for her.

B.The store clerk took an ice cream out to her.

C.She got her ice cream with the big man’s shoes.

D.She left the store without getting her ice cream.小题3:From the story we can conclude (得出结论)that the big man is ______.

A.kind

B.funny

C.honest

D.hard-working

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