To balance a chemical equation we
-coefficients
-subscripts

Coefficients

Explanation:

Coefficients are used to balance chemical equations.According to the law of conservation of mass, the mass of the reactants in a chemical equation should be equivalent to the mass of the products.The conservation of mass is achieved in chemical equations is achieved through balancing chemical equations. Balancing chemical equations is a try and error of putting appropriate coefficients to the reactants or products to ensure that the number of atoms of each element are equal on the side of the reactants and that of products.

Sublimation- which change of state is shown in model

The particles of the gas inside the ball heats up, bouncing off each other and spreading farther apart.hope my answer has you : )