下列有關(guān)金屬的說法錯誤的是

A.金屬的回收利用是保護(hù)金屬資源的有效途徑之一

B.炒完菜后應(yīng)及時除掉鍋底的水,這樣可以防止鐵鍋生銹

C.鋁在空氣中易生成一層致密的氧化物保護(hù)膜,故鋁制品性質(zhì)不穩(wěn)定

D.生鐵和鋼是含碳量不同的鐵合金,其中生鐵的含碳量大于鋼的含碳量

練習(xí)冊系列答案
相關(guān)習(xí)題

科目:初中化學(xué) 來源: 題型:


雨水資源化是一種發(fā)展趨勢。

(1)受酸性氣體影響,雨水在降落過程中形成了酸雨。要測定某雨水酸堿度,可使用                    。

(2)收集的地面雨水常攜帶樹葉、泥沙等不溶性雜物,應(yīng)進(jìn)行沉淀、__________等處理;寫出圖中①號儀器的名稱         ,②號儀器的作用是         。

查看答案和解析>>

科目:初中化學(xué) 來源: 題型:


某化學(xué)興趣小組同學(xué)用Na2CO3溶液和濃HCl來研究簡易滅火器的反應(yīng)原理時,對廢液的成分進(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(xué)完成實驗探究,并完成實驗報告。

實驗步驟

現(xiàn)象

結(jié)論

該廢液中一定沒有鹽酸                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

該廢液中一定含有Na2CO3

查看答案和解析>>

科目:初中化學(xué) 來源: 題型:


下列符號書寫正確且與名稱相一致的是

A.鎂 Ng          B.麟 P          C.銅 Co         D.氟 F

查看答案和解析>>

科目:初中化學(xué) 來源: 題型:


施肥是農(nóng)業(yè)增產(chǎn)的重要手段,下列化肥中屬于復(fù)合肥料的是

A.KNO3       B.NH4HCO3   C.KCl         D.Ca(H2PO4)2

查看答案和解析>>

科目:初中化學(xué) 來源: 題型:


下列圖像與描述相符的是

 


查看答案和解析>>

科目:初中化學(xué) 來源: 題型:


請用化學(xué)知識回答下列問題。

(1)請你用化學(xué)知識解釋下列成語:

①“點石成金”:______________________________________________;

②“花香四溢”:______________________________________________;

  (2)造成“煤氣中毒”的氣體是_____________,為防止“煤氣中毒”事件的發(fā)生,請你給居民一條建議________________________________________。

 

查看答案和解析>>

科目:初中化學(xué) 來源: 題型:


 甲、乙、丙、丁都是含有碳元素的物質(zhì),它們之間有如下轉(zhuǎn)化關(guān)系:

⑴甲+丙→  乙    ⑵乙+O2→ 丙       ⑶丁在高溫下分解可得到丙

則按甲、乙、丙、丁順序依次排列正確的一組是                           (     )

A.C、CO、CO2、CaCO3                B.C、CO2、CO、Na2CO3

 C.CO、C、CO2、CaCO3                D.CO2、C、CO、CaCO3

查看答案和解析>>

科目:初中化學(xué) 來源: 題型:


下圖是實驗室用語制備氣體的一些儀器,按要求答題:

  (1)寫出用A制取氧氣的化學(xué)方程式                              ,其反應(yīng)基本類

       型為              ,收集裝置為               。

  (2)用裝置B可以制備氣體               (填氣體化學(xué)式),發(fā)生反應(yīng)的化學(xué)方程式

                                      

 

查看答案和解析>>

同步練習(xí)冊答案