论文部分内容阅读
阅卷现场直击2015年的试题稳中求新,整体表现更加灵活新颖。与2014年相比,比如,必做题第26-28题在总分43分不变的情况下,得分率有明显下滑,建议考生在必要的题海训练之外更注重拓展思维训练。第26题(1)中指定酸性锌锰干电池放电过程产生MnOOH,致使许多考生不能灵活对待导致出错。除标准答案外,MnO_2+e~-+NH_4~+=MnOOH+NH_3给分,一些考生考虑MnOOH而写成MnO_2+e~-+H_2O=MnOOH+OH~-,因不符合酸性锌锰干电池定义不得分(很多考生在此出
Scored on the scene Watch 2015 test steady, the overall performance of more flexible and novel. Compared with 2014, for example, you must do the questions 26-28 in the case of a total score of 43 points unchanged, the score rate has dropped significantly, it is recommended that candidates focus more attention to developing thinking training in addition to the sea title training. Section 26 (1) specified in the acid zinc manganese battery discharge process produces MnOOH, resulting in many candidates can not be treated flexibly lead to errors. In addition to the standard answer, MnO 2 + e ~ - + NH 4 ~ + = MnOOH + NH 3 for points, some candidates consider MnOOH and written as MnO 2 + e ~ - + H_2O = MnOOH + OH ~ Points (a lot of candidates in this out