Answer:
D) 2H₂O → 2H₂ + O₂
Explanation:
Decomposition means water molecules break up into hydrogen and oxygen molecules.
H₂O → H₂ + O₂
We need to balance the equation. There's one O atom on the left, and two O atoms on the right. Put a 2 in front of H₂O.
2H₂O → H₂ + O₂
Now there's 4 H atoms on the left, and 2 H atoms on the right. Put a 2 in front of H₂.
2H₂O → 2H₂ + O₂
The equation is balanced. There are 4 H atoms and 2 O atoms on either side.
