日日人人_亚洲美女在线视频_av手机在线播放_国产大片aaa_欧美中文日韩_午夜理伦三级

D 20.A 21.B 22.C 23.C 24.C 查看更多

 

題目列表(包括答案和解析)

天然氣的主要成分是甲烷(CH4),化學興趣小組的同學對甲烷燃燒的產物產生了興趣,請你參與探究與分析:

【提出問題】甲烷在氧氣中燃燒后生成哪些物質?

【知識儲備】含碳元素的物質在氧氣中完全燃燒生成CO2,不完全燃燒生成CO;

無水CuSO4遇水變藍色。

【猜想與假設】

產 物

猜 想

CO2、H2O

CO、H2O

NH3、CO2、H2O

CO2、CO、H2O

你認為    (17)    同學的猜想是錯誤的,理由是    (18)   

【實驗探究】為了驗證上述猜想與假設,將甲烷在一定量的氧氣中燃燒的產物依次通過

下列裝置:

① A、B裝置的順序    (19)    (填“能”或“不能”)顛倒。

② 實驗中用純凈氧氣而不用空氣的原因是    (20)   

③ 實驗中觀察到A中無水CuSO4粉末由白色變為藍色,B、D中澄清石灰水變渾濁,C中黑色粉末變成光亮的紅色,由此推斷    (21)    同學猜想成立。

④ 請寫出B中澄清石灰水變渾濁、C中黑色粉末變成紅色的化學方程式:

      (22)            (23)     

【反思與交流】為避免有毒的CO污染環境,所以含碳元素的物質燃燒必須滿足的條件

      (24)     

查看答案和解析>>

小明同學想研究一氧化碳的還原性,通過查閱資料知道:草酸(H2C2O4)與濃硫酸混合加熱會產生一氧化碳,反應方程式為:H2C2O4        CO↑+CO2↑+H2O,于是他設計了下圖的實驗裝置,結合裝置回答下列問題:


(1)圖A方框中是用草酸制取CO的反應裝置,你認為應選擇    (20)    全品教學網, 用后離不了!(填“甲”、“乙”或“丙”)裝置;

(2)A裝置中產生的氣體經過B、C裝置(除去雜質),進入D裝置的是純凈的CO氣體,實驗開始時,要先   (21)          ,然后  (22)       ,其目的是排盡空氣,防止爆炸;實驗結束時,為了防止  (23)         ,要注意先停止加熱,繼續通一氧化碳直到冷卻。

(3)裝置D中反應的化學方程式為               (24)              

(4)為檢驗裝置D中產生的氣體,E裝置中的液體應為       (25)              ,化學反應方程式為                          (26)                            

(5)裝置F中酒精燈的作用是               (27)                    。  

查看答案和解析>>

完型填空(共20小題;每小題1分,滿分20分)
閱讀下面短文,掌握其大意,然后從四個選項(A、B、C和D)中,選出最佳選項。
"Hey, Tahlia! How's the model?"
I had just taken a bite of my hot dog __21__ I heard a familiar voice yelling at me from across the crowded school yard. I saw a group of popular girls who were all __22__.
"What kind of __23_ are you going to do? An ad for a Frankenstein movie?" More laughter. My stomach twisted into a tight knot. How could they humiliate (羞辱) me like this, __24__ the entire school? As I walked into the cafeteria, I __25__ the dark scars on my right hand.
At 9 months old, I knocked over a tea pot and dumped boiling water allover my hands and stomach. My parents __26__ me to the hospital, but I had to have skin graft (移植) operation. I was in so much pain! But what __27__ me most were the cruel things people said about how I looked, __28__ that day at lunch.
The girls were being supermean to me because they'd heard I was considering doing some modeling. A close friend had suggested that I shouldn't let my scars limit me and that I might __29__ a good model.
But after that __30__ at school, I was sure I'd made a huge mistake. Upon arriving home, I covered the mirror with a blanket, fell on my bed and sobbed.
The next day, I __31__ myself to go to school. At lunch my best friend Jesse tried to encourage me: "You can't __32_ forever, Tahlia. So what if you have a few scars? Just go outside and show them that you're just as good as they are." Although I knew he was right, I couldn’t __33__ standing up for myself like that.
However, that night as I sat on the bed, my friend's words replayed in my mind. I'm __34__ hiding from myself, I thought. How stupid! Slowly, I stood up, walked over to the __35__, and tossed the blanket aside. There, in the mirror I saw a slim, dark-haired, blue-eyed girl, looking just fine, __36__ with a few scars.
The next day I wore a comfortable T-shirt to school. What's more, I had lunch outside the cafeteria, __37__ beside those mean girls. They were shocked that I should dare to walk into their territory. I felt __38_ too—free and happy.
Sometimes people still look at me strangely. They __39_ and stare, but I don't let it get to me. I have applied to several modeling companies, and at least one company is considering me for jobs. Maybe I'll never __40_ posing on the runway, but I do know one thing: I'm done.
【小題1】
A.as B.when C.while D.before
【小題2】
A.applauding B.cheering C.laughing D.quarreling
【小題3】
A.modeling B.writing C.drilling D.acting
【小題4】
A.in spite of B.in view of C.in terms of D.in front of
【小題5】
A.looked into B.searched for C.wondered aboutD.glanced at
【小題6】
A.presented B.sent C.rushedD.handed
【小題7】
A.hurtB.beat C.disappointed D.puzzled
【小題8】
A.for B.like C.on D.after
【小題9】
A.impressB.make C.consult D.defeat
【小題10】
A.effect B.phenomenon C.challenge D.scene
【小題11】
A.forced B.expected C.reminded D.preferred
【小題12】
A.apologize B.beg C.hide D.complain
【小題13】
A.consider B.imagine C.appreciate D.resist
【小題14】
A.hardly B.ever C.even D.gradually
【小題15】
A.blanket B.bed C.chair D.mirror
【小題16】
A.while B.though C.but D.because
【小題17】
A.right B.still C.therefore D.anyhow
【小題18】
A.sensitive B.uncomfortable C.different D.tense
【小題19】
A.compare B.associate C.wave D.whisper
【小題20】
A.give up B.end up C.put up D.set up

查看答案和解析>>


同步練習冊答案
主站蜘蛛池模板: 欧美视频成人 | 最新中文字幕在线资源 | 91久久久精品视频 | 日韩激情欧美 | 欧美精品 在线观看 | 国产精品福利久久 | 日韩一区二区三区在线视频 | 亚洲一区日韩 | 国产在线一区二区三区 | 在线a视频 | 久草在线观看福利视频 | 日韩三及片 | 国产精品久久久久久久久久免费看 | 黄色一级片视频播放 | 午夜精品一区二区三区在线视频 | 久久久久久久久久久九 | 成人亚洲精品 | 黄色综合网站 | 青青草在线免费观看 | 色天天| 和尚风流一级艳片 | 黄色影院在线观看 | 91成人区| 99色资源 | 欧洲尺码日本国产精品 | 日韩国产一区二区 | 欧美婷婷 | 日本中文在线 | av黄色一级| 亚洲国产精品免费 | 久久免费国产精品 | 99精品全国免费观看视频软件 | 国产一区二区精品在线 | 国产精品久久久久久一级毛片 | 亚洲精品美女久久久 | 伊人天堂在线 | 欧美一级免费 | 国产精品久久久久免费a∨ 国产激情一区二区三区 | 青青草原国产在线 | 激情久久av一区av二区av三区 | 亚洲综合在线播放 |