Practice problem
Which is not a valid chemical reaction?
2H2O→H3O++OH−2H_{2}O\rightarrow H_{3}O^{+}+OH^{-}2H2O→H3O++OH−
C6H12O6+6O2→6CO2+6H2OC_{6}H_{12}O_{6}+6O_{2}\rightarrow 6CO_{2}+6H_{2}OC6H12O6+6O2→6CO2+6H2O
2NH4+→2NH3+H22NH_{4}^{+}\rightarrow 2NH_{3}+H_{2}2NH4+→2NH3+H2
Fe2O3+2Al→Al2O3+2FeFe_{2}O_{3}+2Al\rightarrow Al_{2}O_{3}+2FeFe2O3+2Al→Al2O3+2Fe
Type a concept, like “slope” or “photosynthesis”.
