题干

根据短文内容,回答问题。

    Li Dong is a schoolboy. He's twelve. He lives in Beijing. He gets up at 6:30. He reads English and Chinese in the morning. He has breakfast at 7:00. In the afternoon, he has three classes. He often does the homework after dinner. Li Dong likes playing football. His mother's hobby is planting flowers. His father is interested in collecting stamps. He often shows the nice stamps to Li Dong and his mum. They like the stamps very much.

上一题 下一题 0.0难度 选择题 更新时间:2013-05-08 09:26:27

答案(点此获取答案解析)

同类题2

氨的催化氧化是工业制硝酸的重要反应,500°C,其反应方程式为:

4NH3(g)+5O2(g)⇌4NO(g)+6H2O(g)+Q,完成下列填空:

(1)如果要提高上述反应的反应速率,可以采取的措施是____ 

a.减压         b.增加NH3的浓度   c.升温     d.将水液化移走.

(2)在500℃时,在2L密闭容器中加入10mol NH3、10mol O2,上述可逆反应达到平衡,过程如图所示,在a时刻改变反应条件,重新达到平衡,该改变的条件可能是____ ,比较b时刻与c时刻反应氨的转化率大小(填“>”或“<”)b____ c.其它条件不变,c时刻加压后,若平衡正向移动,其原因可能是____ 若在d时刻重新达到平衡,请在图中画出c到d的相关变化图象____ 

(3)工业上以氨和空气为原料生产硝酸,请画出硝酸工业的物质流程图.____ 

(4)氨中氮元素原子最外层电子排布的轨道表达式是____ ,短周期元素原子所形成的与N 3电子排布相同的离子所对应的原子的半径从大到小的排列顺序为____ .其中非金属元素形成的氢化物的稳定性由强到弱为的顺序为(用化学式表示)____ 

(5)已知NH3与N2H4都是氮的氢化物,N2H4的电子式是____ .NH3与N2H4都具有还原性,可以与其它强氧化剂反应,例如在一定条件下,氨可以被双氧水氧化为游离态氮,写出该反应的化学方程式____