Final answer:
In the equation CH₄ + O₂ ➡ 2H₂O + CO₂, C, H, and O are all unbalanced.
Step-by-step explanation:
The given chemical equation is: CH₄ + O₂ ➡ 2H₂O + CO₂. We can see that the elements C, H, and O are all unbalanced in this equation, as the number of atoms of each element is different on the reactant side compared to the product side. To balance the equation, we can start by balancing the C and H atoms. By changing the coefficients for the product species, we can balance the C and H atoms as follows: CH₄ + O₂ ➡ 2H₂O + CO₂.
This equation is now balanced for C and H atoms, but the number of O atoms is still unbalanced. We can see that there are 3 O atoms on the product side, but only 2 O atoms on the reactant side. To balance the O atoms, we can change the coefficient for O₂ to 2, resulting in the balanced equation: CH₄ + 2O₂ ➡ 2H₂O + CO₂.
Therefore, the answer is A. C, H, and O are all unbalanced in this equation.