题干

碳酸氢铵是一种常见的化肥,受热时易分解,其分解的化学方程式为:NH4HCO3═□↑+H2O+CO2↑;则□中表示的物质的化学式为____
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答案(点此获取答案解析)

NH3

同类题1

阅读理解

    How could we possibly think that keeping animals in cages in unnatural environments, mostly for entertainment purposes, is fair and respectful?

    Zoo officials say they are concerned about animals. However, most zoos remain “collections” of interesting “things” rather than protective habitats. Zoos teach people that it is acceptable to keep animals bored, lonely, and far from their natural homes.

    Zoos claim to educate people and save endangered species, but visitors leave zoos without having learned anything meaningful about the animals' natural behavior, intelligence, or beauty. Zoos keep animals in small spaces or cages, and most signs only mention the species' name, diet, and natural range. The animals' normal behavior is seldom noticed because zoos don't usually take care of the animals' natural needs.

    The animals are kept together in small spaces, with no privacy and little opportunity for mental and physical exercise. This results in unusually and self-destructive behavior called zoo-chosis(圈禁性精神病). A worldwide study of zoos found that zoochosis is common among animals kept in small spaces or cages. Another study showed that elephants spend 22 percent of their time making repeated head movements or biting cage bars, and bears spend 30 percent of their time walking back and forth, a sign of unhappiness and pain.

    Furthermore, most animals in zoos are not endangered. Captive breeding(圈养繁殖) of endangered big cats, Asian elephants, and other species has not resulted in their being sent back to the wild. Zoos talk a lot about their captive breeding programs because they do not want people to worry about a species dying out. In fact, baby animals also attract a lot of paying customers. Haven't we seen enough competitions to name baby animals?

    Actually, we will save endangered species only if we save their habitats and put an end to the reasons people kill them. Instead of supporting zoos, we should support groups that work to protect animals' natural habitats.

同类题5

阅读以下材料,说说以下化学探究活动是由哪些环节组成的,将其分别填在相应的括号内.

燃烧是我们经常接触到的一种化学变化.它与我们的生活密切相关.燃烧为人类带来了光明,如果失控也会给人类带来灾难.因此,人类必须了解物质为什么会燃烧,才能控制燃烧,使其更好地造福于人类.

小童想:物质燃烧需要哪些条件?(____ )

(1)可能需要一种可以燃烧的物质;

(2)可能需要一定的温度;

(3)可能需要氧气.(____ )

小童设计了实验方案:

实验1:用镊子分别夹取一小木条和小石子,将它们分别放在酒精灯外焰上加热,观察实验现象.

实验2:用镊子分别夹取一小纸片、小木条、小煤块,分别在酒精灯上点燃,观察实验现象,比较三者点燃的难易程度.

实验3:在桌面上点燃两支蜡烛,在一支蜡烛上方罩上250mL烧杯,观察实验现象.(____ )

小童对实验现象进行了记录和分析:


实验现象

得出的结论

 实验1

小木条燃烧了,小石子不燃烧.

燃烧需要可燃物

 实验2

小纸片最易燃烧,小木条次之,小煤块最难燃烧.

燃烧需要达到可燃物燃烧所需的温度.

 实验3

 桌面上的蜡烛正常燃烧,罩上烧杯的蜡烛燃烧一会儿就熄灭.

 燃烧需要氧气.

小童归纳总结,得出燃烧的条件:可燃物;温度;氧气.(____ )

小童觉得,通过这次探究活动,知道了燃烧的条件,能解释钻木取火、森林灭火等现象和原理,并且体验了像科学家一般探究学习的乐趣.(____ ).