下圖是三種微粒的結(jié)構(gòu)示意圖,有關(guān)它們的說(shuō)法正確的是(  )。

A.它們?cè)拥淖钔鈱与娮訑?shù)相同

B.它們的核外都有兩個(gè)電子層

C.它們的性質(zhì)相同

D.它們都是原子

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小琪同學(xué)往如下圖所示的燒杯中加入一種固體物質(zhì),攪拌后,發(fā)現(xiàn)溫度升高,石蠟熔化,塑料片掉了下來(lái)。該同學(xué)加入的物質(zhì)可能是(  )。

A.蔗糖             B.硝酸銨           C.氯化鈉           D.氫氧化鈉

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鋼鐵是重要的金屬材料。

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(2)目前世界上已有50%以上的廢鋼鐵得到回收利用,其主要目的是___________。

A.節(jié)約金屬資源                            B.合理開(kāi)采礦物

C.防止空氣污染                           

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下列食品富含蛋白質(zhì)的是(  )。

A.牛奶             B.米飯         C.牛油             D.鮮橙汁

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下列生活中的做法中,正確的是(    )。

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②________________________________________________________________________。

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某化學(xué)興趣小組同學(xué)用Na2CO3溶液和濃HCl來(lái)研究簡(jiǎn)易滅火器的反應(yīng)原理時(shí),對(duì)廢液的成分進(jìn)行探究。

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

【實(shí)驗(yàn)探究】  確定廢液成分中是否含有Na2CO3或鹽酸

     請(qǐng)你協(xié)助興趣小組的同學(xué)完成實(shí)驗(yàn)探究,并完成實(shí)驗(yàn)報(bào)告。

實(shí)驗(yàn)步驟

現(xiàn)象

結(jié)論

該廢液中一定沒(méi)有鹽酸                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

該廢液中一定含有Na2CO3

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