Identify each part of this chemical equation, which
describes the breakdown of water into hydrogen and
oxygen.

The chemical reaction of burning methane and oxygen is as follows;

(A (the entire green box): chemical equation

B (the blue box): reactants

C (the arrow): reacts to form

D (the purple box): products (This is the chemical equation)

Here, the reactants are methane and oxygen, one mole of methane reacts with 2 moles of oxygen present in the air;

and the products thus formed are one mole of carbon dioxide and two moles of water.

So here, methane and oxygen reacts to form carbon dioxide and water.

Explanation:I hope I can help you :)