過か酸さん化か水すい素そMeaningsNoun1. H2O2; hydrogen peroxideKanji used過surpass something酸acid化transformation水water素elementaryPitch accentかさんかすいそComposed of過かsurplus-; excess-; over-; per- (chemical with more of a certain element than found in other compounds of the same constituents)Prefix酸さん化かoxidation; oxidizationNoun水すい素そhydrogen (H)Noun