(1)现有含杂质25%的大理石20g(杂质不与盐酸反应)恰好与150g稀盐酸完全

题型:问答题

问题:

(1)现有含杂质25%的大理石20g(杂质不与盐酸反应)恰好与150g稀盐酸完全反应.

求:

①产生二氧化碳多少克?

②稀盐酸中溶质的质量分数为多少?

(2)质量相同的Na2CO3和CaCO3分别与足量稀盐酸反应,产生二氧化碳的质量比为______.

考点:化学反应方程式的计算关于溶液的计算
题型:问答题

阅读理解

     One morning, Mr Smith comes into the garden at the back of his house. He sees much snow in the

garden. He wants to drive his car out, so he asks a man to clean the road from the garage(车库) to the

gate. He says to the man, "Don't throw any snow on that side. It will damage(损坏) the flowers in my

garden, and don't throw any on the other side, for it will damage the wall and don't throw any into the

street, or the policeman will come." Then he goes out.

     When Mr Smith comes back, the road is clean. There is no snow on the flowers, on the wall or in the

street. But when he opens the garage to get his car out, he sees the garage is full of snow and the car is

under the snow.

1. One morning, Mr Smith finds _____ is full of'snow.

A. his garage    

B. his car          

C. his garden        

D. his house

2. He wants a man to clean the road because           .

A. he doesn't like snow

B. he often asks the man to do it

C. he has no time to clean the road

D. he wants to drive his car out of the garage

3. Where does Mr Smith tell the man to throw the snow in the garden?

A. On the wall.                    

B. On the flowers.

C. We don't know.                  

D. Into the street.

4. When Mr Smith opens the garage, _       .

A. he finds it is full of snow          

B. he takes the snow out

C. he finds there is no car there        

D. he takes his car out

5. Mr Smith's car is           .

A. in the street

B. under the snow from the road

C. in front of his house

D. near the road

题型:问答题

已知集合A={x|x=2k+1,k∈z},B={x|x=2k-1,k∈z},C={x|x=4k+1,k∈z},D={x|x=4k-1,k∈z},给出下面六个命题:①A=B,②C=D,③A∩B=∅,④C∩D=∅,⑤C∪D=A,C∪D=B,其中真命题的个数是(  )

A.2

B.3

C.4

D.5

题型:问答题

一批货物总重1.28×107千克,下列运输工具可将其一次性运走的是

A.一辆板车

B.一架飞机

C.一辆大卡车

D.一艘万吨巨轮

题型:问答题

在我们日常生活中,有许多身边的事可以为保护环境作贡献,如节约用水、随手关灯、参加植树、不浪费一粒粮食等行为,这些都是____________ 的具体体现。[      ]

A.增强法制观念

B.环保法具有国家强制性

C.落实环保行动

D.同破坏环境的行为作斗争

题型:问答题

肘关节前脱位,肘部呈靴样畸形。

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