问题 选择题

下列有关叙述正确的是(    )

A.配制一定物质的量浓度的溶液和萃取实验前,都必须检验所用仪器是否漏水

B.将4 g NaOH溶入准确量取的100 mL水中,可制得浓度为1 mol/L的NaOH溶液

C.如果不慎将稀盐酸沾到皮肤上,应先用NaOH溶液涂抹,再用水冲洗

D.最好用蒸馏的方法分离出CCl4和水的混合物B

答案

答案:A

题目分析:配制一定物质的量浓度的溶液需要用容量瓶,萃取实验需要用分液漏斗,这两种仪器都是带活塞的仪器,所以需要验漏,A对。将4g NaOH溶于水配成100mL溶液,所得溶液的浓度为1 mol/L,B错。不慎将稀盐酸沾到皮肤上,应先用大量水清洗,再用NaHCO3溶液涂抹,C错。CCl4和H2O互不相溶,所以用分液的方法分离,D错。答案选A。

点评:这是化学实验最基础的知识。

问答题
单项选择题

I was a single parent of four small children, working at a low paid job. Money was always tight, but we had a (1) over our heads, food on the table, clothes on our backs, and if not a lot, always (2) . Not knowing we were poor, my kids just thought I was (3) . I’ve always been glad about that.

It was Christmas time, and although there wasn’t (4) for a lot of gifts, we planned to celebrate with a family party. But the big (5) for the kids was the fun of Christmas (6) .

They planned weeks ahead of time, asking (7) what they wanted for Christmas. Fortunately, I had saved MYM120 for (8) to share by all five of us.

The big (9) arrived. I gave each kid a twenty-dollar bill and (10) them to look for gifts of about four dollars each. Then everyone scattered. We had two hours to shop; then we would (11) back at the "Santa’s Workshop".

Driving home, everyone was in high Christmas spirits, (12) my younger daughter, Ginger, who was unusually (13) . She had only one small, flat bag with a few candies—fiftycent candies! I was so angry, but I didn’t say anything (14) we got home. I called her into my bedroom and closed the door, (15) to be angry again. This is what she told me.

"I was looking (16) thinking of what to buy, and I (17) to read the little cards on the ’Giving Trees’. One was for a little girl, four years old, and all she (18) for Christmas was a doll. So I took the card off the tree and (19) the doll for her. We have so much and she doesn’t have anything. "

I never felt so (20) as I did that day.

7()

A. the other

B. each other

C. one by one

D. every other one