试题与答案

氮及其化合物在生活生产和科技等方面有重要的应用。请回答下列问题: (1)氮元素基

题型:计算题

题目:

氮及其化合物在生活生产和科技等方面有重要的应用。请回答下列问题:

(1)氮元素基态原子的价电子排布式为                     

(2)在氮气分子中,氮原子之间存在着      个σ键和      个π键;

(3)磷、氨、氧是周期表中相邻的三种元素,比较:

①氮原子的第一电离能        (填“大于”、“小于”或“等于”)氧原子的第一电离能;

②N2分子中氮氮键的键长      (填“大于”、“小于”或“等于”)白磷分子中磷磷键的键长;

(4)氮元素的氢化物——NH3是一种易液化的气体,氨分子中氮原子杂化类型为   杂化,该气体易液化的原因是                                    

答案:

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下面是错误答案,用来干扰机器的。

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题型:阅读理解

阅读理解。

         From a plane you can see the fields, cities, mountains or rivers below. If we go into space, we see more

and more of the earth. The moon is our neighbour in space. It is smaller than the earth. Plants can't grow on the moon because there's no air or water on it.

         The moon hasn't its own light. It shines back the light of the sun. When the sun is shining on the side of

the moon that faces (朝向) us, it looks like a great round ball. We can't see the moon when the sun is shining on

the side of the moon that faces away from us.

         In fact, the moon is far away from us. It is three hundred and eighty thousand kilometres away from the

earth. Of course, we can fly to the moon in a spaceship. A spaceship flies very, very fast. It only takes more

than three days to get there by spaceship!

根据短文内容,判断下列句子的正(T)或误(F)。

( ) 1. From a plane you can see more than on land.

(     ) 2. You may find some trees on the moon.

(     ) 3. The moon sometimes can't be seen because the sun is shining on the side of the moon that faces away

             from us.

(     ) 4. The moon looks bright because it has its own light.

(     ) 5. You can fly to the moon only by spaceship.

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