问题 填空题

实验室用图示装置制取氧气,并进行铁丝在氧气中燃烧的实验.铁可以在氧气中剧烈燃烧.请回答下列问题.

(1)任意写出图中两种仪器的名称:______、______.

(2)在做实验之前,要先检查______.

(3)写出铁丝在氧气中燃烧反应的符号表达式:______,该反应属于______反应.

答案

(1)图示的制取氧气的装置中,涉及到的仪器有酒精灯、试管、铁架台、水槽、集气瓶等;

(2)为防止气体逸散而使制取气体的实验顺利进行,需要确保各仪器的连接处不漏气,因此在进行实验前,应先对装置的气密性进行检查,确定了装置气密性良好时再进行制取的实验;

(3)铁丝在氧气中燃烧时生成黑色固体四氧化三铁,该反应的文字表达式为:铁+氧气

点燃
四氧化三铁,用铁、氧气、四氧化三铁的化学式Fe、O2、Fe3O4代替各物质即可写出反应的符号表达式Fe+O2
点燃
Fe3O4,该反应由铁、氧气两种物质反应生成四氧化三铁一种物质,符合“多变一”的化合反应的特点,因此该反应属于化合反应;

故答案为:

(1)酒精灯,试管(其它正确答案均可);

(2)装置的气密性;

(3)Fe+O2

点燃
Fe3O4,化合.

完形填空
注意:每个空格只填1个单词。请将答案写在答题纸(卡)上相应题号的横线上。
When young children are learning to ride a bicycle, they require that their parents hold on to the back of the bike so that they gain confidence and won’t fall off.
However, when children leave to go to college, or get married, parents must accept that their children are riding off into their own future. At this time, parents shouldn’t stand back and with the children gone, they are left with an empty nest. How can parents get through this period of life?
The first thing you should do is nothing at all. You should actually take some time to rest since your child was born. Just relax and reward yourself for the work you put into your child.
Taking some time for yourself will allow you to adjust to the change and figure out how you really feel about your child’s departure (离开). You shouldn’t compare how you feel with how other people feel, as everyone’s experience of an empty nest is different.
Exercise is a great mood lifter. A physical fitness program may have been one of the first sacrifices (牺牲) you made when your child came along; now, with fewer duties, you’ll have time to hit the gym regularly. If you have a friend who also has become an empty nester recently, you may have found a new companion. Not only will you get the chance to share dealing with tips, you’ll also create social opportunities for yourself, which will get you out of that empty house if you need to.
We all have those things that we say we’ll do or learn “someday”. If you’re an empty nester, the “someday” might just be now.
If you’re not sure exactly what to do in all your spare time, take your time and think about it. It will, however, probably be easier to figure out your dream when you’re out. Try exploring a nearby museum or attraction you’ve never visited.
Many parents may fear an empty nest because they worry that their little birds have flown away forever. Try setting up a regular phone date with your child. A once-a-week call may make you feel satisfied while giving your child a reasonable degree of freedom.
Phenomenon
★Young children need the help of parents to make them feel confident.
★Children will leave home after growing up and parents will feel 小题1: __▲__.
小题2:__▲__ to
adjust to an empty
nest
小题3:__▲__ yourself
★Do nothing but rest.
★Take time to adjust to the change and to figure out your小题4:__▲__.
Take小题5:__▲__
★You can have 小题6: __▲__ time to go to the gym.
★You can develop new 小题7:__▲__ and create social opportunities.
Follow your dream
★You get a 小题8:__▲__ to put your dream into practice.
★It will be easier to figure out your dream when you are out of the house.
Set a time for
communication
★小题9:__▲__ your child once a week will make you feel satisfied.
★Give your child enough 小题10:__▲__.
 
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