Final answer:
The chemical reaction equation H₂ + 2O → H₂O is an example of a synthesis reaction where hydrogen gas and oxygen gas combine to form water.
Step-by-step explanation:
The chemical reaction equation H₂ + 2O → H₂O is an example of a synthesis reaction. In a synthesis reaction, elements or compounds combine to form a single new substance. In this case, hydrogen gas (H₂) and oxygen gas (O₂) combine to form water (H₂O).
To balance the equation, the coefficients in front of the reactants and products need to be adjusted so that the number of atoms of each element is the same on both sides of the equation. The balanced equation would be 2H₂ + O₂ → 2H₂O.