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第64页

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$\text {CO}_{2}＋4\text {H}_{2}\xlongequal[ ]{ }\text {CH}_{4}＋2\text {H}_{2}\text {O}_{}$

分子是由原子构成(合理即可)

$\text {2H}_2\text {O}\xlongequal[\ \ \ \ \ \ ]{通电}2\text {H}_2↑+\text {O}_2↑$

$\text {2KMnO}_4\xlongequal[\ \ \ \ \ \ ]{△}\text {K}_2\text {MnO}_4+\text {MnO}_2+\text {O}_2↑$

$\text {2Cu+O}_2\xlongequal[\ \ \ \ \ \ ]{△}2\text {CuO}$

$\text {2H}_2\text {O}_2\xlongequal[\ \ \ \ \ \ ]{\text {MnO}_2}2\text {H}_2\text {O}+\text {O}_2↑$

$\text {CO}_2+\text {Ca(OH)}_2\xlongequal[\ \ \ \ \ \ ]{\ \ \ \ \ \ }\text {CaCO}_3↓+\text {H}_2\text {O}$

$\text {CaCO}_3+2\text {HCl}\xlongequal[\ \ \ \ \ \ ]{\ \ \ \ \ \ }\text {CaCl}_2+\text {H}_2\text {O}+\text {CO}_2↑$

$\text {2KClO}_3\xlongequal[△ ]{\text {MnO}_2}\text {2KCl+3O}_2↑$

$4\text {Al}+3\text {O}_2\xlongequal[\ \ \ \ \ \ ]{}2\text {Al}_2\text {O}_3$