问题 问答题

根据下列装置图回答问题:

(1)写出图中仪器①、②、③、④的名称分别是______、______、______、______;

(2)实验室用KClO3制取氧气时应选用的装置为______ (填装置代号,下同);

(3)实验室制取CO2时一般选用装置______,若要检验集气瓶中CO2是否收满,就采取的方法是______.

答案

(1)根据常用仪器的用途可知图中仪器分别是:酒精灯、试管、铁架台、集气瓶;

故答案为:酒精灯、试管、铁架台、集气瓶;

(2)氯酸钾在二氧化锰作催化剂,加热的条件下生成氯化钾和氧气,属于“固体加热型”,氧气不易溶于水,可用排水法收集,所以用A装置;

故选A;

(3)实验室制取二氧化碳是用大理石和稀盐酸常温反应生成二氧化碳、水和氯化钙,属于“固液常温型”,且二氧化碳能溶于水,不能用排水法,其密度比空气大,用向上排空气法收集,二氧化碳不能燃烧,也不支持燃烧,可利用此性质进行验满;

故答案为:B,将燃着的木条放于集气瓶口,若木条熄灭,说明二氧化碳已收集满.

单项选择题

The amazing success of humans as a (91) is the result of the evolutionary development of our brains which has led, among other things, to tool-using, tool-making, the (92) to solve problems by logical reasoning, thoughtful cooperation, and language. One of the most striking ways in which chimpanzees biologically (93) humans (94) in structure of their brains. The chimpanzee, with the capacity for (95) reasoning, (96) a type of intelligence more like that of humans than (97) any other mammal living today. The brain of the modern chimpanzee is probably not too dissimilar (98) the brain that so many millions of years ago (99) the behavior of the first ape man.
For a long time, the fact that prehistoric people made (100) was considered to be one of the major (101) distinguishing them from other creatures. (102) pointed out earlier, I have watched chimpanzees (103) grass stems in order to use them to probe for termites. It is tree that the chimpanzee does not (104) tools to "a regular and set pattern"—but then, (105) people, before their development of stone tools, undoubtedly poked around (106) sticks, and straws, at which stage it seems (107) , that they made tools to a set pattern either.
It is because of the close (108) in most people’s minds of tools with humans (109) special attention has always been focused upon any animal able to use an object as a tool: but it is important to realize that this ability, on its own, does not necessarily indicate any special intelligence in the creature (110) .

A.remains

B.lies

C.rests

D.situates

单项选择题