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氧气是初中化学重点,近年来中考、竞赛中开发出一些新题型:现选三例供赏析. 一、考查研究性学习实验方法例1 某中学化学小组查阅资料发现金属氧化物A也能催化氯酸钾的分解,且A和二氧化锰的最佳催化温度均在500℃左右.于是,对A和二氧化锰的催化性能进行了定量对照实
Oxygen is the focus of junior high school chemistry. In recent years, some new questions have been developed in the middle school entrance examination and competition. Three cases are currently selected for appreciation. First, examine research methods for experimental studies Example 1 The chemical group of a middle school found out that metal oxide A can also catalyze The decomposition of potassium chlorate, and the best catalytic temperature of A and manganese dioxide are all around 500 °C. Therefore, the catalytic performance of A and manganese dioxide was quantitatively verified.