Direct experience through experimental teaching materials is important for students to acquire scientific concepts . Here we describe a case study conducted at a public high school in Nagano Prefecture . in which our proposed unit program of seven hours class based on the energy concept was administered to students to understand oxidation − reduction through the principle of electro − chemical ce 旺 by a successive combination of five kinds of experiments . Through experiments using daily life

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... terials such as crystai earphone and fruits , students not only enhanced their learning wills , but also correlated chemistry with daily life experiences . ALthough students were at first perplexed by experiments deating with unfamiiiar phenomena , they created a common key word from the questi ns they encountered . lnvestigations for answering the questiens made students confident in science study , as they solved the questions by themselves through experiments , and , through the unit program , most students understood the concepts of oxidation − reduction and electro − chemical cell, based on the energy concept . It is thus suggested that our unit program focusing on direct experimental experience is useful for students to gain deeper understanding of oxidation −reduction and the principle of electro − chemical cell.