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听力原文：M: I'm getting worried about our son. All he talks about these days is the games and all he does is practice. W: His grades will fall for sure. Let's have a talk with him when he's back and talk some sense into him. Q: What are the speakers probably going to tell their son? (15)A.
To try playing a new game.
B.
Not to worry about his grades.
C.
To spend more time on his studies.
D.
To teach them how to play the games.
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【简答题】对反应3CuS+2 +8H + ====3S+2NO+3Cu 2+ +4H 2 O 已知 ( /NO)=0.96V， (S/S 2- )=-0.51V， (CuS)=6.3×10 -36 ，计算 (S/CuS)和反应的平衡常数 。
【单选题】已知如下物质的溶度积常数: FeS : K sp = 6.3×10 - 18 ; CuS : K sp = 6.3×10 - 36 。下列说法正确的是 ( )
A.
同温度下， CuS 的溶解度大于 FeS 的溶解度
B.
同温度下，向饱和 FeS 溶液中加入少量 Na 2 S 固体后， K sp (FeS) 变小
C.
向含有等物质的量的 FeCl 2 和 CuCl 2 的混合溶液中逐滴加入 Na 2 S 溶液，最先出现的沉淀是 FeS
D.
除去工业废水中的 Cu 2 ＋ ，可以选用 FeS 作沉淀剂
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