复古学术风手绘黑板化学结构式实验器材科学教育背景

scientific illustration, minimalist style, black background, white and light gray color scheme, chemical molecular structures and symbols such as H2O, CH3, NO2, randomly scattered, professional and academic atmosphere, decorative elements of chemical symbols and structural formulas, chalkboard texture background, chalk-drawn effect, clear and educational visual, conveying chemistry knowledge and scientific research