Here's the breakdown:

* Chemical Reactions: In a chemical reaction, atoms are rearranged, not created or destroyed.

* Balancing Equations: A balanced chemical equation reflects this principle. The number of atoms of each element on the reactant side (starting materials) must equal the number of atoms of that element on the product side (resulting substances).

Example:

The reaction of hydrogen gas (H₂) and oxygen gas (O₂) to form water (H₂O):

Unbalanced Equation: H₂ + O₂ → H₂O

Balanced Equation: 2H₂ + O₂ → 2H₂O

Explanation:

* In the balanced equation, there are 4 hydrogen atoms (2 x 2) and 2 oxygen atoms on both sides of the equation.

* The coefficients (2 and 2) are used to ensure the number of atoms of each element is equal on both sides.

This principle is fundamental to chemistry and helps us understand how chemical reactions work and how to predict the outcome of reactions.