情景对话

—Where shall we take our children this weekend?

—We could take them to Water World or to Oldfield Adventure Park.__1__

—Well, how far away are they? I don't want to spend all day in the car.

—__2__But Oldfield Adventure Park will take about two and a half hours if we're lucky.

—__3__

—Water World has a huge fun swimming pool.__4__

—I really don't like zoos.I hate seeing animals in cages.

—Well, there aren't any animals at Water World.

—If we are going there, I'm going to take a picnic basket. I know they have got restaurants but they

always expensive.__5__

—That's a good idea.I’ll tell the children.

—Ok.

A. Our children love animals very much.

B. Do they have swimming pools?

C. I'd rather eat in restaurants.

D. They love that sort of thing. Which one do you prefer?

E. The Oldfield Adventure Park hasn't got a pool, but it's got a small zoo.

F. Well, Water World is pretty close-about one hour away.

G. I'd rather take our own food and drinks.

做完“铁在氧气里燃烧”实验后，小冬同学有两个疑惑不解的问题，于是她进行了以下探究活动，请你一同参与．

[问题1]铁燃烧时溅落下来的黑色物质中还有没有铁呢？

[查阅资料1]

（1）自然界中铁的氧化物主要是Fe₃O₄（黑色）和Fe₂O₃（红褐色）两种[FeO（黑色）极易被氧化为Fe₂O₃]；

（2）铁的氧化物均能溶于盐酸或硫酸的溶液．

（3）铁单质也能与盐酸或硫酸的溶液反应，生成氢气．

[实验探究]

将冷却后的黑色物质碾碎，装入试管，加入______溶液，观察到的现象是______，说明铁燃烧时溅落下来的黑色物质中还含有铁．

[问题2]铁燃烧的产物为什么不是Fe₂O₃呢？

[查阅资料2]

（1）Fe₃O₄和Fe₂O₃的分解温度、铁的熔点见表：

[理论探讨]

根据实验现象，并结合表中数据，可推知铁在氧气里燃烧时产生的高温应在______之间，在此温度范围内Fe₂O₃已分解，所以铁在氧气里燃烧的产生是Fe₃O₄．

[拓展延伸]

（1）实验中为了防止集气瓶炸裂，必须______；

（2）Fe₂O₃高温时会分解成Fe₃O₄和一种气体，请写出此反应的文字表达式______；

（3）有些超市的食品密封包装盒的透明盖内放有黑色的FeO粉末，若粉末的颜色______，就说明包装盒破损进气，这样售货员就能及时发现并处理．