近年来 ,重视能力和化学学科素质的考查是中考化学改革的特点。为进一步考查学生的创新精神和实践能力 ,各地中考试题中设置了一类探究性实验试题。如 (2 0 0 2年太原市中考题 ) :过氧化氢(H2 O2 )是医疗上常用的一种消毒液 ,常温时在二氧化锰作催化剂的条件下 ,可发生分解反应 In recent years, the examination of the ability and the quality of chemistry disciplines has been the hallmark of chemical reforms in the middle school exams. In order to further examine the students’ innovative spirit and practical ability, a series of exploratory experimental questions were set up in various local examination questions. Such as (2002 Taiyuan exam) : Hydrogen peroxide (H2O2) is a commonly used medical disinfectant, at room temperature in the case of manganese dioxide as a catalyst, decomposition reactions can occur