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第二单元 我们周围的空气 课题 2 氧气

第二单元 我们周围的空气 课题 2 氧气. 点燃. 点燃. 点燃. 硫 + 氧气 二氧化硫. 碳 + 氧气 二氧化碳. 铁 + 氧气 四氧化三铁. 化合反应：由 两种 或 两种 以上物质生成另 一种 物质的反应。. 氧化反应：物质与氧的反应. 燃烧： 发光、放热、剧烈的氧化反应。. 缓慢氧化： 缓慢放热，不易察觉的氧化反应。. 钢铁生锈、动植物呼吸、食物腐烂、酒、醋的酿造、农家肥的腐熟.

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第二单元 我们周围的空气 课题 2 氧气

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  1. 第二单元 我们周围的空气课题2 氧气

  2. 点燃 点燃 点燃 硫 + 氧气 二氧化硫 碳 + 氧气 二氧化碳 铁 + 氧气 四氧化三铁 化合反应：由两种或两种以上物质生成另一种物质的反应。

  3. 氧化反应：物质与氧的反应 燃烧：发光、放热、剧烈的氧化反应。 缓慢氧化：缓慢放热，不易察觉的氧化反应。 钢铁生锈、动植物呼吸、食物腐烂、酒、醋的酿造、农家肥的腐熟

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