初中常考的化学方程式的现象和作用现象如S+O2 点燃SO2 剧烈燃烧、放热、刺激味气体、空气中淡蓝色火焰.氧气中蓝紫色火焰 作用如碳酸钠与浓盐酸反应:Na2CO3 + 2HCl === 2NaCl + H2O + CO2↑ (泡沫

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