问题 问答题

实验室用稀盐酸和石灰石制二氧化碳气体,并对所制的气体进行检验,请回答下列问题.

(1)如图是完成上述实验的部分装置图,请在图中标出仪器A和药品B的名称,完成此图尚未画出部分的装置图,并画上药品.

(2)写出制该气体反应的化学方程式______.

答案

用化学方法制取气体,就需考虑反应中反应物状态和反应条件.实验室用稀盐酸和石灰石制二氧化碳气体,属于固液不需要加热的化学反应,所以可以选用带有长颈漏斗的双孔的橡皮塞.检验是否有二氧化碳的生成的方法是:将澄清的石灰水变浑浊,即可说明有新物质的生成.

(1)插入气体发生装置内的导管只需刚刚露出塞子即可,这样才能有利于气体导出.稀盐酸应从长颈漏斗加入,长颈漏斗的下端管口要伸入液面以下,防止反应生成的气体从长颈漏斗逸出.

(2)关于此题的化学方程式的书写的书写,属于复分解反应,同时注意配平.

故答案为:(1)A:锥形瓶    B:澄清石灰水

(2)CaCO3+2HCl=CaCl2+H2O+CO2

选择题
完形填空
Once I thought love meant flowers, gifts and sweet kisses. So, I really ___whether there is love between my parents. Everyday they are very busy ___ to earn money to pay the high schooling for me. They don’t act in the ___ways that I read in books or I see in on TV, and sending flowers to each other on Valentine’s Day is even_____.
One day, my mother was sewing a quilt(被子). I asked her if there was ___between them. She stopped her work and raised her head with____. Then she bowered her head and ____sewing the quilt. I was very ___because I thought I had hurt her. But after a few minutes, she said, “look at this thread. Sometimes it ___, but most of the time it disappears in the quilt. If life is a quilt, then love should be a thread. It can___ seen anywhere or anytime, but it’s really there, and makes the quilt____.” I listened carefully but I couldn’t understand her___ the next spring.
My mother suddenly got sick seriously and had to stay in the hospital for a one-month treatment. Every morning and dusk after she___ from the hospital, my father___ my mother walking slowly on the country road. There were beautiful flowers, green grass and tress, and the sun gently shine them___ the leaves. All of these___ the most beautiful picture in the world. ___ their eyes, I know they love each other deeply. From this experience, I ___ that love was just a ___ in the quilt of our life. Love is __ making life strong and warm.
小题1:
A.believeB.hesitateC.knowD.doubt
小题2:
A.keepingB.willingC.tryingD.learning
小题3:
A.magicB.romanticC.averageD.special
小题4:
A.unsuitableB.impoliteC.uneasyD.impossible
小题5:
A.differenceB.loveC.similarityD.fight
小题6:
A.surpriseB.angerC.smileD.calm
小题7:
A.finishedB.continuedC.forgotD.considered
小题8:
A.excitedB.worriedC.shockedD.disappointed
小题9:
A.existsB.worksC.appearsD.breaks
小题10:
A.easilyB.hardlyC.simplyD.usually
小题11:
A.long-lastingB.long-datedC.long-sufferingD.long-winded
小题12:
A.afterB.beforeC.untilD.since
小题13:
A.returnedB.escapedC.remainedD.heard
小题14:
A.ledB.letC.caughtD.helped
小题15:
A.fromB.throughC.acrossD.throughout
小题16:
A.made withB.made upC.made intoD.made of
小题17:
A.ReadingB.WatchingC.SeeingD.Checking
小题18:
A.expectedB.realizedC.noticedD.thread
小题19:
A.materialB.designC.colorD.thread
小题20:
A.everywhereB.insideC.anywhereD.outside