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初中迎考总复习系列练习一(基本概念和基本理论部分)浙江李林芳一、选择题1.下列几种变化:①石墨变成金刚石②胆矾受热变成白色粉末③水煤气燃烧④用二氧化碳制干冰。其中属于纯净物发生化学变化的是()A.@@B.@@C.@@D.@@2.放在空气中会变质并发生...
The junior high school meets the general review series exercise 1 (basic concept and basic theory part) Zhejiang Li Linfang 1, multiple choice questions 1. The following changes have been made: 1 Graphite turned into diamond 2 Cholesterol heated to white powder 3 Water gas fired 4 Dry ice was made from carbon dioxide. Which belongs to the chemical change of the pure substance is () A. @@B. @@C. @@D. @@2. Put in the air will spoil and happen...