The Law of Conservation of Mass says that in a chemical reaction, you can’t create or destroy matter.

This law is really important when we balance equations. Here’s why:

• You have to make sure that the number of each type of atom is the same on both sides of the equation.
• It helps us know how much of each reactant and product we need.

So, when you balance reactions, it’s like making sure everything adds up correctly!

For example, in this reaction:

$\text{A} + \text{B} \rightarrow \text{C} + \text{D}$

If you start with 2 A and 3 B, then you will need 2 C and 3 D to keep everything balanced.

It's that simple!