题目

(1)用化学用语填写下列空白: 2个氢原子____,硝酸根离子____,亚铁离子____,硫酸钠____,氧化铜_____。 (2)写出下列反应的化学方程式: ①电解水:_____________________________________; ②氢气在氧气里燃烧:_______                      。 答案：（1）2H  NO3-  Fe2+  Na2SO4  CuO  （2）①    ②She says she will come to visit our school _____ next week.A. sometime B. some time C. some times D. sometimes