Write the balanced chemical equation for the reaction shown. Carbon is represented by a black sphere, nitrogen by a blue sphere, chlorine by a green sphere, and hydrogen by a white sphere. In the reactants there are three molecules that contain one black sphere and four white spheres. There are three molecules that contain two blue spheres and four green spheres. In the products there are three molecules that contain one black sphere and four green spheres. There are three molecules that contain two blue spheres. There are six molecules that contain two white spheres.

3CH₄ + 3N₂Cl₄ → 3CCl₄ + 3N₂ + 6H₂

Explanation:

    Carbon_black sphere

    Nitrogen_blue sphere

    Chlorine_green sphere

    Hydrogen_white sphere

Reactants:

Three molecules that contain one black sphere and four white spheres

3CH₄          

Three molecules that contain two blue spheres and four green spheres:

3N₂Cl₄

Products:

Three molecules that contain one black sphere and four green spheres:

3CCl₄

Three molecules that contain two blue spheres:

3N₂

Six molecules that contain two white spheres

6H₂

The reaction proper:

3CH₄ + 3N₂Cl₄ → 3CCl₄ + 3N₂ + 6H₂

Sidenote: I hope this answer helps!