问题 填空题

(10分)化学实验中常常使用火柴,已知火柴头含有硫、氯酸钾、二氧化锰等,火柴盒侧面含有红磷、三硫化二锑等,请回答以下问题:

(1)火柴梗主要成分是纤维素,纤维素属于      (填序号)。

A.蛋白质          B.糖类          C.油脂

(2)火柴盒侧面使用红磷而不使用白磷,其原因之一是因为红磷的着火点          (填“高”或“低”),火柴划燃时,会产生白烟,白烟的主要成分的化学式为            

(3)锑的元素符号是Sb,则三硫化二锑的化学式为             。硫在空气中燃烧的化学方程式为                                  

答案

(1)B(2)高;  P2O5(3)Sb2S3; S + O2 SO2

(1)纤维素是由葡萄糖组成的大分子多糖,所以纤维素属于糖类,填B;

(2)可燃物燃烧有三个必须同时具备的条件:可燃物、氧气或空气、温度达到可燃物的着火点,火柴盒侧面用红磷而不用白磷,其原因之一是因为红磷的着火点高,不易点燃,比较安全;磷燃烧生成五氧化二磷固体,白烟是五氧化二磷的固体小颗粒形成的.(3)利用三硫化二锑的名称书写化学式为Sb2S3;硫在空气中燃烧的化学方程式为S + O2 SO2

解答题
单项选择题

When Dave was eighteen, he bought a secondhand car for 200 so that he could travel to and from work more (1) than by bus. It worked quite well for a few years, but then it got so old, and it was costing him (2) much in repairs that he decided that he had better (3) it.

He asked among his friends to see if anyone was particularly (4) to buy a cheap car, but they all knew that it was falling to pieces, so (5) of them had any desire to buy it. Dave’s friend Sam saw that he was (6) when they met one evening, and said, "What’s (7) , Dave"

Dave told him, and Sam answered, "Well, what about advertising it in the paper You may (8) more for it that way than the cost of the advertisement!" Thinking that Sam’s (9) was sensible, he put an advertisement in an evening paper, which read "For sale: small car, (10) very little petrol, only two owners. Bargain at 50. " For two days after the advertisement first appeared, there was no (11) . But then on Saturday evening he had an enquiry. A man rang up and said he would like to (12) him about the car. "All right, " Dave said, feeling happy. He asked the man whether ten o’clock the next morning would be (13) or not. "Fine, " the man said, "and I’ll (14) my wife. We intend to go for a ride in it to (15) it. "

The next morning, at a quarter to ten, Dave parked the car in the square outside his front door, (16) to wait there for the people who had (17) his advertisement. Even Dave had to (18) that the car really looked like a wreck. Then, soon after he had got the car as clean (19) it could be, a police car stopped just behind him and a policeman got out. He looked at Dave’s car and then said, "Have you reported this (20) to us yet, sir\

6().

A.delighted 

B.upset 

C.calm 

D.astonished