Answer: 1CH+1O₂= 1 CO₂+1H₂O
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Explanation: coefficients are the 1s. Atoms are C,H,O. Molecules are CH,O₂,CO₂,H₂0. Reactants are CH and O₂. Products are CO₂ and H₂O
Double replacement means a reaction that includes two molecules that each have two different ions. After the reaction, the ions pairs have switched, which is what is shown in the above equation.
A single replacement would be a very simple reactions such as:
2Fe(II)S + Ov2^2- -> 2Fe(II)O + 2S^2-
A decomposition reaction would be shown as this:
2NaCl -(dissolve in water)> 2Na^+ + Clv2^-
A synthesis reaction could be the exact opposite:
2Na^1+ + Clv2^1- -> 2NaCl