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An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. Redox reactions are common and vital to some of the basic functions of life, including photosynthesis, respiration, combustion, and corrosion or rusting.
A + BC → AC + B Element A is a metal in this general reaction and replaces element B, a metal in the compound as well. If the replacement element is a non-metal, it must replace another non-metal in a compound, and it becomes the general equation. Many metals easily react with acids, and one of the reaction products when they do so is hydrogen gas. Zinc reacts to the aqueous zinc chloride and hydrogen with hydrochloride acid (see figure below).
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aluminium4Al + 3O2 => 2Al2O3 2Al + 3Br2 => 2AlBr3 2Al + 3CuO => Al2O3 + 3Cu View all equations with Al as reactant
hydrogen chlorideFe + 2HCl => FeCl2 + H2 2HCl + Zn => H2 + ZnCl2 HCl + NaOH => H2O + NaCl View all equations with HCl as reactant
hydrogen chlorideCO + H2O + PdCl2 => 2HCl + CO2 + Pd Cl2 + C3H8 => HCl + C3H7Cl C2H5Cl => C2H4 + HCl View all equations with HCl as product