A chemical equation is said to be balanced when the number of atoms of each element is the same on both sides of the equation.To demonstrate that a chemical equation is balanced, you need to count the number of atoms of each element on both sides of the equation and make sure they are equal

Here's an example of a balanced chemical equation:

CH₄ + 2O₂ → CO₂ + 2H₂O

In this equation, we can see that there is 1 carbon atom on both sides, 4 hydrogen atoms on both sides, and 2 oxygen atoms on both sides. This means the equation is balanced.

If an equation is not balanced, you can balance it by adding coefficients in front of the reactants and products. Coefficients tell us how many molecules or moles of each substance are involved in the reaction.

Here's an example of how to balance an unbalanced equation:

2H₂ + O₂ → H₂O

In this equation, there are 4 hydrogen atoms on the left side and only 2 hydrogen atoms on the right side. To balance the equation, we can add a coefficient of 2 in front of the H₂O:

2H₂ + O₂ → 2H₂O

Now the equation is balanced, as there are now 4 hydrogen atoms on both sides.