问题 选择题

实验是化学研究的基础。下列关于各实验装置的叙述不正确的是

A.装置①可用于乙醇与水的分离

B.装置②所示实验可比较硫、碳、硅三种元素的非金属性强弱

C.装置③,关闭弹簧夹,向长颈漏斗中注水后,长颈漏斗内水面高度保持不变能说明装置不漏气

D.图④装置可用来称量一定质量的NaOH固体

答案

答案:D

题目分析:A、乙醇与水互溶,但二者的沸点相差较大,可以用蒸馏的方法分离,A正确;B、稀硫酸与碳酸钠反应生成CO2,CO2通入到硅酸钠溶液中,生成白色沉淀硅酸,所以装置②所示实验可比较硫、碳、硅三种元素的非金属性强弱,B正确;C、装置③,关闭弹簧夹,向长颈漏斗中注水后,长颈漏斗内水面高度保持不变,能说明装置不漏气,C正确;D、氢氧化钠具有吸水性和腐蚀性,用托盘天平称量时,应该非在烧杯中称量,D不正确,答案选D。

阅读理解

阅读理解:

    The sea looks very beautiful when the sun is shining on it. But people are afraid of it when there is a strong

wind.

    The sea is very big. It covers (覆盖)three quarters of the earth. The sea is also very deep (深)in some

places. There is one place in the sea. It is about 11 kilometers deep there. The highest mountain (山)in the

world is about 9 kilometers high. If we put the mountain into the sea at that place, there is about 2 kilometers

of water above it.

    In most parts of the sea, there are a lot of fishes and small living (有生命的)things.

    Lots of fishes eat them. The sea can be very cold. When people go down, the sea becomes colder and colder.

Only some men can go down into the deep sea. But in 1970, five women lived in the deep sea for fourteen days.

1. Why are people afraid of the sea? [ ]

A. Because the sea is very big.

B. Because the sea is very deep.

C. Because there is a strong wind sometimes.

D. Because the sea will cover the land.

2. Lots of fishes ______. [ ]

A. don't come out of the sea because it's too hot

B. can't live in the deep sea

C. have enough food because they are good at fishing

D. can eat the small living things if they're hungry

3. In 1970, five women lived in the deep sea for 14 days. This showed ______. [ ]

A. living in the deep sea was interesting

B. the sea was not cold at all

C. women could do things as men

D. people wanted to know how cold it was

4. Which of the following is NOT true? [ ]

A. The sea sometimes is very beautiful.

B. Only a quarter of the earth is land.

C. There are a lot of fishes in the sea.

D. If people go down into the sea, they will feel warmer and warmer.

问答题 简答题