Animated video: 37 principles of chemical reactions and their dangers—Golden zinc oxide
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Principle: When heated to high temperatures, the white zinc oxide powder gradually turns golden yellow, and its color fades again when cooled in air. The color is produced because zinc oxide crystals lose some oxygen atoms at high temperatures, thereby forming lattice defects. Fun fact: The color of many gems is also related to lattice defects, such as colored diamonds. Hazard: Medium to high. To observe the color change of zinc oxide, it needs to be heated to around 800°C, and special care must be taken when using a high-temperature flame. Recorder: AppliedScience
Hazard: Medium to high. To observe the color change of zinc oxide, it needs to be heated to around 800°C, and special care must be taken when using a high-temperature flame.