问题 填空题

(8分)在一体积为1 L的容器中,通入一定量的N2 O4,在100℃时发生如下反应:

(1)在0-60s这段时间内,以N2O4表示的平均反应速率为        mol·L-1·s-1

(2)上述反应的平衡常数表达式为             ,升高温度K值          (填“增大"、“减小”或“不变”)

(3)反应进行到100s时,若有一项条件发生变化,变化的条件不可能是           (填选项序号)。

A.降低温度

B.通人氦气使其压强增大

C.又往容器中充入N2O4

D.使用催化剂

答案

(1)0.001

(2)K= 增大

(3)BCD

(1) mol·L-1·s-1

(2)由平衡常数的概念可知:K=;由于△H>0,升温平衡正向移动,K增大

(3)由图像可知,逐渐减小,而逐渐增大,平衡左移,故:

A:降温平衡左移,与图像相符

B:恒容下通入氩气,各物质浓度不变,正逆反应速度不变,平衡不发生移动,与图像不符

C:又往容器中充入N2O4瞬间增大,与图像不符

D:使用催化剂,不影响平衡移动,各物质浓度不变,与图像不符

故BCD符合题意

单项选择题

C

A scientist working at her lab bench and a six-old baby playing with his food might seem to have little in common.After all,the scientist is engaged in serious research to uncover the very nature of the physical world,and the baby is,well, just playing…right?Perhaps,but some developmental psychologists()have argued that this“play”is  more like a scientific investigation than one might think.

Take a closer look at the baby playing at the table.Each time the bowl of rice is pushed over the table edge,it

falls in the ground---and, in the process, it belongs out important evidence about how physical objects interact ; bowls of rice do not flood in mid-sit, but require support to remain stable. It is likely that babies are not born knowing the basic fact of the universe; nor are they ever clearly taught it. Instead, babies may form an understanding of object support through repeated experiments and then build on this knowledge to learn even more about how objects interact. Though their ranges and tools differ, the baby’s investigation and the scientist’s experiment appear to share the same aim(to learn about the natural world ), overall approach (gathering direct evidence from the world), and logic (are my observations what I expected?).

Some psychologists suggest that young children learn about more than just the physical world in this way---that they investigate human psychology and the rules of language  using similar means. For example, it may only be through repeated experiments, evidence gathering, and finally overturning a theory, that a baby will come to accept the idea that other people can have different views and desires from what he or she has, for example, unlike the child , Mommy actually doesn’t like Dove chocolate.

Viewing childhood development as a scientific investigation throws on how children learn ,but it also offers an inspiring look at science and scientists. Why do young children and scientists seem to be so much alike? Psychologists have suggested that science as an effort ---the desire to explore, explain, and understand our world---is simply something that comes from our babyhood. Perhaps evolution provided human babies with curiosity and a natural drive to explain their worlds, and adult scientists simply make use of the same drive that served them as children. The same cognitive systems that make young children feel good about feel good about figuring something out may have been adopted by adult scientists. As some psychologists put it, ”It is not that children are little scientists but that scientists are big children.”

We learn from Paragraph 2 that()

A. scientists and babies seem to observe the world differently

B. scientists and babies often interact with each other

C. babies are born with the knowledge of object support

D. babies seem to collect evidence just as scientists do

单项选择题