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初三学生在化学方程式的书写方面往往存在着种种问题,现将同学们平时存在的错误,归类分析如下,请同学们注意.一、错写或漏写反应条件错例:(1)S+O2ΔSO2(2)CuO+CO点燃Cu+CO2(3)CaCO3ΔCaO+CO2↑(4)C+O2燃烧CO2(5)2H2O电解2H2↑+O2↑(6)CO2+C=2CO(7)Cu2(OH)2CO3高温2CuO+CO2↑+H2
There are many problems in the third grade students’ writing of chemical equations. Now we classify and analyse the mistakes that the students usually have. Please pay attention to the students. 1. Wrong or miss-write reaction conditions: (1)S +O2ΔSO2(2) CuO+CO Ignite Cu+CO2(3) CaCO3 CaCaO+CO2↑(4)C+O2 Combustion CO2(5)2H2O Electrolysis 2H2↑+O2↑(6)CO2+C=2CO(7)Cu2( OH)2CO3 High Temperature 2CuO+CO2↑+H2