问题 填空题

用所给单词的适当形式填空。

1. The weather is quite _____ (wind) in Jinan in fall.

2. The students are busy _____ (do) some exercises.

3. This film is very _____ (excite). We all like to see it.

4. My parents didn't feel _____ (good) last Sunday.

5. Tom often goes _____ (hike) in spring with his friends.

6. Whose book is this? Is it _____ (you)?

7. The Palace Museum in Beijing is a famous place of _____ (interesting).

8. I enjoy _____ (listen) to music.

9. The supermarket is on the _____ (three) floor.

10. I like spring _____ (well) than summer.

答案

1. windy 2. doing 3. exciting 4. well 5. hiking 6. yours 7. interest 8. listening 9. third 10. better

填空题

W、X、Y、Z是四种常见的短周期元素,其原子半径随原子序数变化如下图所示。已知W的一种核素的质量数为14,中子数为7;X的离子与NH4+具有相同的质子、电子数目; W与Y的氧化物均能导致酸雨的形成;Z的非金属性在同周期主族元素中最强。

(1)Y在周期表中的位置是            。

(2)用电子式解释X与W能形成化合物X3W的原因           

(3)X3W遇水可释放出使酚酞溶液变红的气体A,化学方程式是         

(4)用惰性电极电解化合物XZ溶液从阴极释放出气体B,反应的离子方程式是       

(5)已知W的单质与气体B在一定条件下可形成气体A,即: W2 (g)+3B (g) 2A(g)  △H =-92.4 kJ・mol―1  

在某温度时,一个容积固定的密闭容器中,发生上述反应。在不同时间测定的容器内各物质的浓度如下表:

时间浓度(mol/L)
c(W2)c(B)c(A)
第0 min4.09.00
第10min3.88.40.4
第20min3.47.21.2
第30min3.47.21.2
第40min3.67.80.8
 

①W2的平均反应速率v(0min~10min)/ v(10min~20min) =        

②反应在第10min改变了反应条件,改变的条件可能是         

a.更新了催化剂   b.升高温度   c.增大压强   d.增加B的浓度

③若反应从第30min末又发生了一次条件改变,改变的反应条件可能是        

a.更新了催化剂   b.升高温度   c.增大压强   d.减小A的浓度

单项选择题