题目内容
配平下列的各个化学反应的方程式
______CH4+______O2
______CO2+______H2O
______C2H5OH+______O2
______CO2______H2O
______C2H2+______O2
______CO2+______H2O
______Al+______CuSO4=______Al2(SO4)3+______Cu
______Al+______H2SO4=______Al2(SO4)3+______H2↑
______Al2O3+______H2SO4=______Al2(SO4)3+______H2O
______CO+______Fe3O4
______Fe+______CO2.
______CH4+______O2
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______C2H5OH+______O2
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______C2H2+______O2
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______Al+______CuSO4=______Al2(SO4)3+______Cu
______Al+______H2SO4=______Al2(SO4)3+______H2↑
______Al2O3+______H2SO4=______Al2(SO4)3+______H2O
______CO+______Fe3O4
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用观察法:先观察元素种类和原子个数,先配化合物,再配单质.
CH4+2O2
CO2+2H2O.故答案为:1;2;1;2;
C2H5OH+O2
CO2+H2O.故答案是:1;3;2;+3;
2C2H2+5O2
4CO2+2H2O.故答案是:2;5;4;2;
2Al+3CuSO4=Al2(SO4)3+3Cu.故答案是:2;3;1;3;
2Al+3H2SO4=Al2(SO4)3+3H2↑.故答案是:2;3;1;3;
Al2O3+3H2SO4=Al2(SO4)3+3H2O.故答案是:1;3;1;3;
4CO+Fe3O4
3Fe+4CO2.故答案是:4;1;3;4.
CH4+2O2
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C2H5OH+O2
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2C2H2+5O2
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2Al+3CuSO4=Al2(SO4)3+3Cu.故答案是:2;3;1;3;
2Al+3H2SO4=Al2(SO4)3+3H2↑.故答案是:2;3;1;3;
Al2O3+3H2SO4=Al2(SO4)3+3H2O.故答案是:1;3;1;3;
4CO+Fe3O4
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