【題目】某化學(xué)實(shí)驗(yàn)小組同學(xué)利用以下實(shí)驗(yàn)裝置制取氨氣,并探究氨氣的性質(zhì)(部分儀器已略去)。請回答:
(1)實(shí)驗(yàn)室制備氨氣的化學(xué)方程式為______________________。
(2)用裝置B收集氨氣時(shí),應(yīng)選擇氨氣的進(jìn)氣口是________(填“a”或“b”),并說明選擇的理由是________________________________。
(3)打開裝置B中的止水夾c,若觀察到燒瓶內(nèi)產(chǎn)生了紅色噴泉,則說明氨氣具有的性質(zhì)是________________、________________。
(4)為防止環(huán)境污染,以下裝置(盛放的液體均為水)可用于吸收多余氨氣的是________(填序號(hào))。
年級(jí) | 高中課程 | 年級(jí) | 初中課程 |
高一 | 高一免費(fèi)課程推薦! | 初一 | 初一免費(fèi)課程推薦! |
高二 | 高二免費(fèi)課程推薦! | 初二 | 初二免費(fèi)課程推薦! |
高三 | 高三免費(fèi)課程推薦! | 初三 | 初三免費(fèi)課程推薦! |
科目:高中地理 來源: 題型:
【題目】短文改錯(cuò)
假定英語課上老師要求同桌之間交換修改作文,請你修改你同桌寫的以下作文。文中共有10處語言錯(cuò)誤,每句中最多有兩處。每處錯(cuò)誤僅涉及一個(gè)單詞的增加、刪除或修改。
增加:在缺詞處加一個(gè)漏字符號(hào)(/\),并在其下面寫出該加的詞;
刪除:把多余的詞用斜線(\)劃掉;
修改:在錯(cuò)詞下畫一橫線,并在該詞下面寫出修改后的詞。
注意:1. 每處錯(cuò)誤及其修改均僅限一詞;
2. 只允許修改10處,多者(從第11處起)不計(jì)分。
Recently, people were moved by a story taking the place in Thailand. It told about a girl whom had a quarrel with her mother and ran away from home. After several days, the girl walked into a restaurant in hungers. A man who was the cook invites her to sit down and then made some delicious food for him. The girl was very surprising. Then the cook told the girl that a woman took a photo and asked him whether he seen the girl. But the woman gave him some money to cook for the girl if she turned up. Until then the girl realized how greatly her mother was and she should be grateful on her.
查看答案和解析>>
科目:高中地理 來源: 題型:
【題目】短文改錯(cuò)
假定英語課上老師要求同桌之間交換修改作文,請你修改你同桌寫的以下作文。文中共有10處語言錯(cuò)誤,每句中最多有兩處。錯(cuò)誤涉及一個(gè)單詞的增加、刪除或修改。
增加:在缺詞處加一個(gè)漏詞符號(hào)(∧),并在其下面寫出該加的詞。
刪除:把多余的詞用斜線(\)劃掉。
修改:在錯(cuò)的詞下劃一橫線,并在該詞下面寫出修改后的詞。
注意:
1. 每處錯(cuò)誤及其修改均僅限一詞;
2. 只允許修改10處,多者(從第11處起)不計(jì)分。
Last month while I was walking in the street, the foreigner came towards me. She seemed to be losing. She asked me if I could help him. I said yes, but when she started talking, I couldn’t understand that she said. I could only say "I don’t know", and then slowly walk away. Though I have studied English for six years, but I still can’t understand English good enough. I know I’m not interested in English and I’ve also been very lazy to study it. Now I know the importances of learning English. I’ve decided change my attitude towards English and work hard on it.
查看答案和解析>>
科目:高中地理 來源: 題型:
【題目】如圖所示,水平放置的兩導(dǎo)軌P、Q間的距離L=0.5 m,垂直于導(dǎo)軌平面的豎直向上的勻強(qiáng)磁場的磁感應(yīng)強(qiáng)度B=2 T,垂直于導(dǎo)軌放置的ab棒的質(zhì)量m=1 kg,系在ab棒中點(diǎn)的水平繩跨過定滑輪與重量G=3 N的物塊相連。已知ab棒與導(dǎo)軌間的動(dòng)摩擦因數(shù)μ=0.2,電源的電動(dòng)勢E=10 V、內(nèi)阻r=0.1 Ω,導(dǎo)軌的電阻及ab棒的電阻均不計(jì)。要想ab棒處于靜止?fàn)顟B(tài),電阻R應(yīng)在哪個(gè)范圍內(nèi)取值?(g取10 m/s2)
查看答案和解析>>
科目:高中地理 來源: 題型:
【題目】短文改錯(cuò)
假定英語課上老師要求同桌之間交換修改作文,請你修改你同桌寫的以下作文。文中共有10處語言錯(cuò)誤,每句中最多有兩處。錯(cuò)誤涉及一個(gè)單詞的增加、刪除或修改。
增加:在缺詞處加一個(gè)漏詞符號(hào)(∧),并在其下面寫出該加的詞。
刪除:把多余的詞用斜線(\)劃掉。
修改:在錯(cuò)的詞下劃一橫線,并在該詞下面寫出修改后的詞。
注意:
1. 每處錯(cuò)誤及其修改均僅限一詞;
2. 只允許修改10處,多者(從第11處起)不計(jì)分。
Dear guests,
On behalf of our school, I would like to express our warm welcome to you. We are luck to have you here in middle of our English Week Activities. As planning, we have English Talent Show today. The purpose of this program was to develop our interest in English learning and practically abilities in listening and speaking. The program consists in the following activity: recitation, singing, word spelling, storytelling and so on. The show will begin at two o’clock this afternoon at the Student Centre. Dear guests, we are welcome to take part in some activities. I hope we students will be benefit from your presence but I sincerely wish you a pleasant time with us.
Thank you.
查看答案和解析>>
科目:高中地理 來源: 題型:
【題目】一理想變壓器原、副線圈匝數(shù)比n1∶n2=11∶5。原線圈與正弦交變電源連接,輸入電壓u如圖所示。副線圈僅接入一個(gè)10Ω的電阻,則( )
A.流過電阻的電流是20A
B.與電阻并聯(lián)的電壓表的示數(shù)是100V
C.經(jīng)過1分鐘電阻發(fā)出的熱量是6×103 J
D.變壓器的輸入功率是1×103 W
查看答案和解析>>
科目:高中地理 來源: 題型:
【題目】溫度傳感器廣泛應(yīng)用于室內(nèi)空調(diào)、電冰箱等家用電器中,它是利用熱敏電阻的阻值隨溫度變化的特殊性來工作的。如圖甲所示,電源的電動(dòng)勢E=9 V,內(nèi)阻不計(jì);G為靈敏電流表,內(nèi)阻Rg保持不變;R為熱敏電阻,其電阻阻值與溫度的變化關(guān)系如圖乙所示。閉合開關(guān)S,當(dāng)R的溫度等于20°C時(shí),電流表示數(shù)I1=2 mA。求:當(dāng)電流表的示數(shù)I2=3.6 mA時(shí)熱敏電阻的溫度。
查看答案和解析>>
科目:高中地理 來源: 題型:
【題目】如圖所示,原長分別為L1和L2、勁度系數(shù)分別為k1和k2的輕質(zhì)彈簧豎直懸掛在天花板上,兩彈簧之間有一質(zhì)量為m1的物體,最下端掛著質(zhì)量為m2的另一物體,整個(gè)裝置處于靜止?fàn)顟B(tài)。
(1)這時(shí)兩個(gè)彈簧的總長度為多大?
(2)若用一個(gè)質(zhì)量為M的平板把下面的物體豎直緩慢地向上托起,直到兩個(gè)彈簧的總長度等于兩彈簧的原長之和,求這時(shí)平板受到上面物體m2的壓力。
查看答案和解析>>
科目:高中地理 來源: 題型:
【題目】如圖所示,傳送帶保持v=4 m/s的速度水平勻速運(yùn)動(dòng),將質(zhì)量為1 kg的物塊無初速地放在A端,若物塊與皮帶間動(dòng)摩擦因數(shù)為0.2,A、B兩端相距6 m,則物塊從A到B的過程中,皮帶摩擦力對(duì)物塊所做的功為多少?產(chǎn)生的摩擦熱又是多少?(g取10 m/s2)
查看答案和解析>>
湖北省互聯(lián)網(wǎng)違法和不良信息舉報(bào)平臺(tái) | 網(wǎng)上有害信息舉報(bào)專區(qū) | 電信詐騙舉報(bào)專區(qū) | 涉歷史虛無主義有害信息舉報(bào)專區(qū) | 涉企侵權(quán)舉報(bào)專區(qū)
違法和不良信息舉報(bào)電話:027-86699610 舉報(bào)郵箱:58377363@163.com