Respuesta :
Since I have not seen the simulation, I can give a generic definition. A balanced chemical equation is when the mass of each element of the reactants (left side) is equal to the mass of each element in the products (right side). Make sure that all of the elements have the same amount on each side.
A chemical equation is balanced, when there are the same amount of atoms in both sides of the equation. Here are some examples of non-balanced and balanced equations:
[tex]O_{4} + CO_{2} \neq O_{3} +CO_{2}[/tex] → non-balanced
[tex]H_{8} + C_{2} = 2H_{4} + C_{2}[/tex] → balanced
Hope it helped,
BioTeacher101