问题 选择题

下列实验操作中,正确的是

A.加热试管里的液体时,液体体积应不少于试管容积的三分之一

B.浓硫酸稀释时,应缓慢的将水加入浓硫酸中,并不断搅拌

C.用玻璃棒搅拌以加速固体溶解时,可用玻璃棒在烧杯中将固体捣碎再溶解

D.闻任何化学药品的气味都不能使鼻子凑近药品

答案

答案:D

考查常见的基本实验操作。选项A不正确,加热试管里的液体时,液体体积应小于试管容积的三分之一;浓硫酸溶于水发出大量的热,所以稀释浓硫酸应该将浓硫酸注入水中,并不断搅拌,选项B不正确;不可以用玻璃棒在烧杯中将固体捣碎再溶解,以防止烧杯的破损,选项C不正确,所以正确的答案选D。

填空题

单词拼写(根据句意、首字母或中文提示用正确形式写出下列单词,

每空一词.提示:必须用必修五、选修六所学新单词.

1.His report was c__________(不断地) interrupted by applause.

2. Can you telephone me at your c_________ to arrange a meeting?

3. Destruction of the environment is one of the most serious ____________(挑战) we face.

4. Her father didn't a_____________ of her marriage to him, which made her very sad.

5. The teacher and his students are d_________ (高兴的)with the result of the experiment.

6. After some repeated a________, they finally succeeded in winning the competition.

7. Is now an a_________(适当的)time to call on Professor Simpson? ?

8. The washing machine is fully __________. (自动的)

9. The monitor gave a present to their headmaster on b_________ of all the students.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           10. He was a_____________ as captain of the English team.

多项选择题