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$\ \text {2H}_2\ \text {O}_2\xlongequal[\ \ \ \ \ \ ]{\ \text {MnO}_2}2\ \text {H}_2\ \text {O}+\ \text {O}_2↑$
$\ \text {CaCO}_3+2\ \text {HCl}\xlongequal[\ \ \ \ \ \ ]{\ \ \ \ \ \ }\ \text {CaCl}_2+\ \text {H}_2\ \text {O}+\ \text {CO}_2↑$
$\ \text {2KMnO}_4\xlongequal[\ \ \ \ \ \ ]{△}\ \text {K}_2\ \text {MnO}_4+\ \text {MnO}_2+\ \text {O}_2↑$
$\mathrm{NH_4HCO_3\xlongequal[]{△}NH_3↑+H_2O+CO_2↑} $
$2\ \text {Mg+O}_2\xlongequal[]{點燃}\ \text {2MgO}$
$4\ \text {P+5O}_2\xlongequal[\ \ \ \ \ \ ]{點燃}2\ \text {P}_2\ \text {O}_5$
? $\ \text {CO}_2+\ \text {Ca(OH)}_2\xlongequal[\ \ \ \ \ \ ]{\ \ \ \ \ \ }\ \text {CaCO}_3↓+\ \text {H}_2\ \text {O}$
$\ \text {H}_2\ \text {CO}_3\xlongequal[\ \ \ \ \ \ ]{}\ \text {H}_2\ \text {O}+\ \text {CO}_2↑$
$\ \text {2H}_2\ \text {O}\xlongequal[\ \ \ \ \ \ ]{通電}2\ \text {H}_2↑+\ \text {O}_2↑$
$\ \text {2H}_2+\ \text {O}_2\xlongequal[\ \ \ \ \ \ ]{點燃}2\ \text {H}_2\ \text {O}$
$\ \text {CO}_2+\ \text {H}_2\ \text {O}\xlongequal[]{}\ \text {H}_2\ \text {CO}_3$
$\ \text {C+O}_2\xlongequal[\ \ \ \ \ \ ]{點燃}\ \text {CO}_2$
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