题干

铜及其化合物在生活、生产中有广泛应用.请回答下列问题:

(1)自然界地表层原生铜的硫化物经氧化、淋滤作用后变成CuSO4溶液向地下深层渗透,遇到难溶的ZnS,慢慢转变为铜蓝(CuS).写出CuSO4转变为铜蓝的离子方程式 ____

(2)工业上以黄铜矿CuFeS2)为原料,采用火法熔炼工艺生产铜的中间过程会发生反应:2Cu2O+Cu2S6Cu+SO2↑,该反应的氧化剂是 ____ ;验证反应产生的气体是SO2的方法是____

(3)图I是一种新型燃料电池,它以CO为燃料,一定比例的Li2CO3和Na2CO3熔融混合物为电解质,图II是粗铜精炼的装置图,假若用燃料电池为电源进行粗铜的精炼实验.


①写出A极的电极反应式 ____

②要用燃料电池为电源进行粗铜的精炼实验,粗铜板应与____ 极(填“A”或“B”)相连;若粗铜中还含有Au、Ag、Fe,它们在电解槽中的存在形式和位置为 ____

③当消耗标准状况下1.12LCO时,精铜电极的质量变化情况为____

(4)现向一含有Ca2+、Cu2+的混合溶液中滴加Na2CO3溶液,若首先生成CuCO3沉淀,根据该实验可得出的结论是 ____ (填序号)

A.Ksp(CuCO3)<Ksp(CaCO3) B.c(Cu2+)<c(Ca2+

C.D.

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答案(点此获取答案解析)

Cu2+\uff08aq\uff09+ZnS\uff08s\uff09=Zn2+\uff08aq\uff09+CuS\uff08s\uff09,Cu2O\uff0cCu2S,\u5c06\u6c14\u4f53\u901a\u5165\u54c1\u7ea2\u6eb6\u6db2\u6eb6\u6db2\u892a\u8272\uff0c\u52a0\u70ed\u6062\u590d\u539f

同类题2

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    Have you ever run into a careless cell phone user on the street? Perhaps they were busy talking, texting or checking updates on WeChat without looking at what was going on around them. As the number of this new “species” of human has kept rising, they have been given a new name —phubbers(低头族).

    Recently, a cartoon created by students from China Central Academy of Fine Arts put this group of people under the spotlight. In the short film, phubbers with various social identities bury themselves in their phones. A doctor plays with his cell phone while letting his patient die, a pretty woman takes selfie in front of a car accident site, and a father loses his child without knowing about it while using his mobile phone. A chain of similar events eventually leads to the destruction of the world.

    Although the ending sounds overstated, the damage phubbing can bring is real.

    Your health is the first to bear the effect and result of it. “Constantly bending your head to check your cell phone could damage your neck,” Guangming Dailyquoted doctors as saying, “the neck is like a rope that breaks after long-term stretching.” Also, staring at cell phones for long periods of time will damage your eyesight gradually, according to the report.

    But that's not all. Being a phubber could also damage your social skills and drive you away from your friends and family. At reunions with family or friends, many people tend to stick to their cell phones while others are chatting happily with each other and this creates a strange atmosphere, Beijing Evening News reported.

    It can also cost you your life. There have been lots of reports on phubbers who fell to their death, suffered accidents, and were robbed of their cell phones in broad daylight.