【題目】下列關(guān)于NH3性質(zhì)的說法正確的是( )

A.收集時(shí)采用向上排空氣法 B.能使?jié)駶櫟募t色石蕊試紙變藍(lán)

C.可用濃硫酸進(jìn)行干燥 D.不能與氧氣反應(yīng)

【答案】B

【解析】氨氣密度比空氣小,所以收集時(shí)采用向下排空氣法,A項(xiàng)錯(cuò)誤;氨氣溶于水生成一水合氨,電離出氫氧根離子,所以氨氣能使?jié)駶櫟募t色石蕊試紙變藍(lán),B項(xiàng)正確;氨氣是堿性氣體,與硫酸反應(yīng),氨氣只能用堿性和中性干燥劑干燥,C項(xiàng)錯(cuò)誤;D、氨氣與氧氣在點(diǎn)燃的條件下生成氮?dú)夂退,D項(xiàng)錯(cuò)誤;答案選B。

練習(xí)冊系列答案
相關(guān)習(xí)題

科目:高中地理 來源: 題型:

【題目】It was with the help of the local guide the mountain climber was rescued.

A. who

B. that

C. when

D. how

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】--- Was he sorry for what hed done?

--- _________.

A. No wonder

B. Well done

C. Not really

D. Go ahead

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】假設(shè)你是中華中學(xué)學(xué)生姚平,最近參加了一項(xiàng)研究性學(xué)習(xí)調(diào)研,課題為“父母是否以子女為榮”。通過調(diào)研你校學(xué)生及其父母,結(jié)果發(fā)現(xiàn)雙方對此問題的看法有差異(數(shù)據(jù)如圖所示)。根據(jù)圖表寫一份報(bào)告,在報(bào)告中,你必須:

1. 描述調(diào)研數(shù)據(jù);

2. 分析可能導(dǎo)致這一結(jié)果的原因。

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】關(guān)于氨的下列敘述中,正確的是(

A.氨因?yàn)橛写碳ば詺馕,因此不用來作制冷?/span>

B.氨具有還原性,可以被氧化為NO

C.氨極易溶于水,因此氨水比較穩(wěn)定(不容易分解)

D.氨溶于水顯弱堿性,因此可使石蕊試液變?yōu)榧t色

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】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(∧),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;

Agony Aunt,

I’m quite annoyed these days. It started from the last Wednesday. I lost a 100-yuan note in the classroom this morning. I asked my deskmate causally if he had seen it. To my great surprise, he burst into angry. “What do you mean by that?” asked him. “I am poor, so I’m never a thief!” I immediately explained, but he simply doesn’t listen. I knew he was too angry at the moment, so I decided to wait a day and two till he cooled down. But he didn’t give me time: the next day, he went to the teacher and asked never be my deakmate no more. Help me, Agony Aunt. How should I do?

Yours,

Li Hua

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】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() 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 Friday, the English class was going on while our English teacher suddenly slip and fell off the stage, which shocked all the students.

Without hesitate, I, under the help of Tom and Mary, carried her on my back to the clinic. All the others classmates waited anxiously in the classroom. It turned out that her right leg broken and she had to stay in the hospital.

After school, we all went to see her. She told me the injury was not severe, but we hoped she would recover soon!

Three days later, we were surprised to see that she was back in a wheelchair. We were joy and deeply moved, clapping and cheering for a long time.

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】請閱讀下面文字及圖標(biāo),并按照要求用英語寫一篇150字左右的文章。

1.Hold fast to dreams

For if dreams die

life is a broken-winded bird

That can never fly.

Hold fast to dreams

For when dreams go

Life is a barren field

From only with snow

2.Strong belief is everything in wishing. If you don’t believe in your own power to make your wish come true, your wish will fly away, never to be seen again. If you’re wishing for something possible, then it may be possible for you to do whatever you need to make it come true. The ultimate magic is not wishing, but doing.

3.Once a teacher received a paper from a boy where he described the dream of owning a 200-acrc horse ranch and a large house. He graded it with a red F, thinking it was an unrealistic dream. Though asked to change it (he boy stated, “You can keep the F and I’ll keep my dream.” Many years later, the boy made it a reality.

85% have a dream

78% have a dream but give up

7% have a dream and realize it

【寫作內(nèi)容】

1.用約30個(gè)單詞概述上述信息的主要內(nèi)容;

2.結(jié)合上述信息,簡要闡述堅(jiān)持夢想的重要性;

3.談?wù)勀愕膲粝?/span> ,并分析實(shí)現(xiàn)夢想的必要要素(不少于兩點(diǎn))。

【寫怍要求】

1.寫作過程中不能直接引用原文語句;

2.作文中不能出現(xiàn)真實(shí)姓名和學(xué)校名稱:

3.不必寫標(biāo)題。

【評分標(biāo)準(zhǔn)】

內(nèi)容完整,語言規(guī)范,語篇連貫,詞數(shù)適當(dāng)。

____________________________________________________________________________________________________________________________________________________________________________________________

_____________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________________

_____________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________________

____________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________________

_____________________________________________________________________________________________

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】地處干旱區(qū)的寧夏銀川市,其周邊地區(qū)曾廣布湖泊,明清時(shí)有七十二連湖的說法。20世紀(jì)80年代銀川周邊湖泊所剩無幾。1999年開始,銀川實(shí)施恢復(fù)濕地的計(jì)劃。下圖示意銀川周圍目前的湖泊分布;卮鹣铝袉栴}。

120世紀(jì)80年代銀川周邊湖泊所剩無幾的主要原因是( )

A.泥沙淤積 B.氣候變暖 C.排水造田 D.黃河來水量減少

【2】疏浚、恢復(fù)湖泊濕地,對銀川環(huán)境的直接影響是( )

增強(qiáng)城市排污能力 增加城市空氣濕度 美化城市環(huán)境 增大城市氣溫年較差[m]

A.①② B.②③ C.③④ D.①④

查看答案和解析>>

同步練習(xí)冊答案