要增大CO2在水中的溶解度,可采用的方法是(   )

A.加壓降溫

B.加壓升溫

C.減壓降溫

D.減壓升溫

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下圖是 a、b、c三種物質(zhì)的溶解度曲線,據(jù)圖回答:

 


(1)當溫度是          ℃,a、b兩種物質(zhì)的溶解度相等;

(2)t3 ℃時三種物質(zhì)的溶解度由大到小的順序是

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自來水消毒過程中常會發(fā)生如下化學反應,其反應的微觀過程可用下圖表示,

  下列有關說法錯誤的是                                            (     )

                                                        

 A.反應的基本反應類型是置換反應

 B.C和D兩種粒子的個數(shù)比是2:1

 C.有的分子由同種原子構成,有的分子由不同種的原子構成

 D.在反應中A和D兩種物質(zhì)的質(zhì)量比是9:8

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在一定溫度下,將少量生石灰放入一定量的飽和石灰水中,攪拌并冷卻至原來溫度,下列說法正確的是( )

A.溶劑質(zhì)量不變

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不能影響物質(zhì)溶解度大小的因素是(   )

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下列圖示實驗操作中,正確的是( 。

類別

物質(zhì)

硫酸、碳酸鈉

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小明為了探究質(zhì)量守恒定律,設計了A、B兩個實驗裝置(如圖所示)。

(1)使用A裝置進行實驗的現(xiàn)象是               

                 ,小明得到的結果是:反應前后反應物的總質(zhì)量與生成物的總質(zhì)量相等;

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(3)請你分析導致出現(xiàn)兩種不同結果的原因是                                ,請?zhí)岢鲆环N改進B裝置的措施                                                           。

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下列事實和解釋相符的是(     )

A.銅絲作導線——銅有良好的導電性   B.鹽酸清除鐵銹——鹽酸能與鐵反應

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科目:初中化學 來源: 題型:


某化學興趣小組同學用Na2CO3溶液和濃HCl來研究簡易滅火器的反應原理時,對廢液的成分進行探究。

【推理假設】  廢液的成分中一定有               ,可能有Na2CO3或鹽酸.

【實驗探究】  確定廢液成分中是否含有Na2CO3或鹽酸

     請你協(xié)助興趣小組的同學完成實驗探究,并完成實驗報告。

實驗步驟

現(xiàn)象

結論

該廢液中一定沒有鹽酸                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

該廢液中一定含有Na2CO3

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