Understanding that matter cannot be created or destroyed is really important in chemistry. This idea is called conservation of mass. It helps us predict what will happen in chemical reactions and makes sure we remember all the substances that are involved.

Key Points:

1. Matter Consistency: In a closed system, the total mass before and after a reaction stays the same.

   For example, if you burn a piece of wood, it looks like it disappears.

   But the mass is still there in the form of ash, gases, and heat.

2. Balancing Equations: We can show chemical reactions with equations.

   For example, when methane burns, we can write it like this: $\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O}$

   In this equation, the total number of atoms of each element is the same on both sides.

3. Real-World Implications: Understanding this idea helps us in many areas, like environmental science, where we keep track of pollutants.

   It’s also useful in cooking, where ingredients change into something new but don’t disappear.

By understanding this concept, we can better understand the world around us and ensure nothing goes to waste.