CuO + 2HCL - CuCl2 + H2O
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CuO + 2HCl --> CuCl2 + H2O This equation is a double displacement; because Cu (Copper) has pushed out O (oxygen), so that Cu can be with Cl (chlorine). Also, H (Hydrogen) has pushed out Cl to be with O. Both elements have pushed out their partner, therefore a double displacement.
ATP plus H2O release energy (endergonic reaction) and P. Now, this P plus ADP becomes ATP (exergonic reaction). It's a cyclic process. It starts all over again at ATP plus H2O..
CH4 + 2O2 --> CO2 + 2(H2O), the products are CO2 and H2O
Na+ and Cl- are spectator ions.
2h2s + so2 - 2h20 + 3s