A:乙醇和钠反应,键①断裂
B:在Ag催化下和O2反应,键①③断裂
C:乙醇和浓H2SO4共热140℃时,键①或键②断裂;在170℃时,键②⑤断裂
D:乙醇完全燃烧时断裂键①②
18-9=( )
(____) Ottawa is the capital city of Canada.
(____) The CN Tower is very tall.
(____) It has five yellow stars.
(____) They speak English and French.
(____) I live in China.
某废催化剂含58.2%的SiO2、21.0%的ZnO、4.5%的ZnS和12.8%的CuS.某同学用15.0g该废催化剂为原料,回收其中的锌和铜.采用的实验方案如下:
回答下列问题: