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The chemical equation for the reaction of methane and oxygen is not yet properly written because the atoms of the elements on the product side do not equal the atoms of each element on the reactant side of the equation. The law of conservation of mass, which states that matter can neither be created nor destroyed in an ordinary chemical reaction, must be upheld when writing a chemical equation. This chemical equation is unbalanced. Another example: NaOH + HCl --> ? Na is Na+, OH is OH-, so this gave us NaOH. Originally the one positive canceled the one negative HCl is H+ + Cl -, this gave us HCl. Reaction is going to be the Na+ reacting with a negatively charged ion. This will have to be the chlorine, Cl-, because at the moment the Na+ is tied to the OH-. So: Na+ + Cl- --> NaCl The H+ from the HCl will react with a negative (-) ion this will be the OH- from the NaOH. So: H+ + OH- --> H2O (water). The complete reaction can be written: NaOH + HCl --> NaCl + H2O. We have equal amounts of all atoms each side of the equation, so the equation is balanced. or Na+OH- + H+Cl- --> Na+Cl- + H+OH- Coupled Reaction Exergonic reactions like burning of glucose drive the endergonic reaction of ATP synthesis. The ATP molecule can then travel to another part of the cell where it is broken down to power another endergonic reaction like protein synthesis.