【单选题】已知: Cu (s)+2H + (aq)=Cu 2+ (aq)+ H 2 (g) △H 1 2H 2 O 2 (l)=2H 2 O(l) + O 2 (g) △H 2 2H 2 (g) + O 2 (g)=2H 2 O(l) △H 3 则反应 Cu (s)+H 2 O 2 (l)+2H + (aq)=Cu 2+ (aq...
【单选题】.We don't have many workers coming to the job interview. I'm afraid we may _____ workers this time.
【简答题】A.Workers have to walk up and down along the assembly line. B.Workers needn't move while the produce is moved. C.Many people accepted the idea of an assembly line at Henry Ford's time. D.Henry Ford's ...
【单选题】下列各组物质发生化学反应:①Fe+ O 2 ②P+Cl 2 ③HNO 3 +Cu④Na+O 2 ⑤Cu+S⑥P 2 O 5 +H 2 O⑦H 2 S+O 2 ⑧C+O 2 ⑨C 2 H 5 OH +O 2 ⑩NH 3 + O 2 在不同条件下能得到不同产物的是 [ ]
【简答题】A. The department don't have morn for more workers. B. The workers they hired aren't tall enough. C. The department is in need of a few more workers. D. The students are not fit to do the job.
【简答题】A.Workers have to walk up and down along the assembly line. B.Workers needn't move while the product is moved. C.Many people accepted the idea of an assembly line at Henry Ford's time. D.Henry Ford's ...
【单选题】已知下列反应的平衡常数:2Cu(s) + 1/2O₂⇌(g)Cu₂O (s) K1Cu₂O(s)+1/2O₂⇌(g) 2CuO (s) K2则反应Cu(s) + CuO(s)=Cu₂O (s) 的K为
【单选题】铜的冶炼工业中:焙烧的主要反应为①2CuFeS 2 +4O 2 ====Cu2S+3SO 2 +2FeO(炉渣);制粗铜时,在1200℃发生的主要反应为②2Cu 2 S+3O 2 ====2Cu 2 O+2SO 2 和③2Cu 2 O+Cu 2 S====6Cu+SO 2 ↑。下列说法错误的______。
A.
由6mol CuFeS 2 生成6molCu,上述共消耗15mol O 2
B.
制粗铜时,Cu 2 S在1200℃反应时只作还原剂
C.
在反应2Cu 2 O+Cu 2 S====6Cu+SO 2 ↑中,电子转移总数是6e -
D.
反应2CuFeS 2 +4O 2 ====Cu 2 S+3SO 2 +2FeO中,SO 2 既是氧化产物,又是还原产物