Application of Experimental Inquiry Teaching Mode in Cultivating Students’ Chemistry Key Competency—the Experimental Inquiry of the Oxidation of Nitric Acid

—Based on the high school chemistry classroom, this paper has taken the nitric acid oxidation as an example and adopted the experiment inquiry teaching mode to cultivate students' chemistry key competency. Taking the copper and nitric acid reaction experiment as the study carrier, according to the relationship between the reactants and the products of the two reactions of the copper and nitric acid and the copper and dilute nitric acid, the paper has connected five related reactions in series, which are copper and concentrated nitric acid, nitrogen dioxide and water, copper and dilute nitric acid, nitric oxide and oxygen, nitrogen dioxide and sodium hydroxide. Thus, the teaching design of experimental inquiry can fully implement the cultivation of five chemistry key competencies for students.